diff --git a/.circleci/config.yml b/.circleci/config.yml
index 8309568..2d05751 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -6,67 +6,48 @@ workflows:
       - test-3.6
       - test-3.7
       - test-3.8
-environment: &test-environment
-  PIPENV_IGNORE_VIRTUALENVS: 1
-  PYTHONPATH: stilus
-  PIPENV_VENV_IN_PROJECT: true
-  PIPENV_QUIET: true
 jobs:
   test-3.6:
     docker:
       - image: circleci/python:3.6
-        environment:
-          <<: *test-environment
     steps:
       - checkout
-      - run: sudo pip install --upgrade pip
-      - run: sudo pip install --upgrade pipenv
-      - run: pipenv --python 3.6 install --dev
-      - run: pipenv run flake8 --exclude=`pipenv --venv` ~/stilus
-      - run: pipenv run python setup.py test
-      - run: pipenv run coveralls
-      - run: pipenv run codecov
-
+      - run: sudo pip install --upgrade poetry
+      - run: poetry install -v
+      - run: poetry run flake8
+      - run: poetry run pytest --cov-report html --cov-report term --cov-report term-missing tests
+      - run: poetry run coveralls
+      - run: poetry run codecov
       - store_test_results:
           path: test-reports
       - store_artifacts:
           path: test-reports
-
   test-3.7:
     docker:
       - image: circleci/python:3.7
-        environment:
-          <<: *test-environment
     steps:
       - checkout
-      - run: sudo pip install --upgrade pip
-      - run: sudo pip install --upgrade pipenv
-      - run: pipenv --python 3.7 install --dev
-      - run: pipenv run flake8 --exclude=`pipenv --venv` ~/stilus
-      - run: pipenv run python setup.py test
-      - run: pipenv run coveralls
-      - run: pipenv run codecov
-
+      - run: sudo pip install --upgrade poetry
+      - run: poetry install -v
+      - run: poetry run flake8
+      - run: poetry run pytest --cov-report html --cov-report term --cov-report term-missing tests
+      - run: poetry run coveralls
+      - run: poetry run codecov
       - store_test_results:
           path: test-reports
       - store_artifacts:
           path: test-reports
-
   test-3.8:
     docker:
       - image: circleci/python:3.8
-        environment:
-          <<: *test-environment
     steps:
       - checkout
-      - run: sudo pip install --upgrade pip
-      - run: sudo pip install --upgrade pipenv
-      - run: pipenv --python 3.8 install --dev
-      - run: pipenv run flake8 --exclude=`pipenv --venv` ~/stilus
-      - run: pipenv run python setup.py test
-      - run: pipenv run coveralls
-      - run: pipenv run codecov
-
+      - run: sudo pip install --upgrade poetry
+      - run: poetry install -v
+      - run: poetry run flake8
+      - run: poetry run pytest --cov-report html --cov-report term --cov-report term-missing tests
+      - run: poetry run coveralls
+      - run: poetry run codecov
       - store_test_results:
           path: test-reports
       - store_artifacts:
diff --git a/.gitignore b/.gitignore
index af595f0..fc84bdc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -18,5 +18,6 @@ stilus.egg-info/
 coverage.xml
 .coverage
 htmlcov/
+test-reports/
 
 debug.log
diff --git a/.travis.yml b/.travis.yml
index 39f7fdf..fa3eff2 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,19 +5,16 @@ python:
   - "3.7"
   - "3.8"
 
-env:
-  global:
-    - PIPENV_IGNORE_VIRTUALENVS=1
-    - PYTHONPATH=stilus
+before_install:
+  - pip install poetry
 
 install:
-  - pip install pipenv
-  - pipenv install --dev
+  - poetry install -v
 
 script:
-  - pipenv run flake8
-  - pipenv run python setup.py test
+  - poetry run flake8
+  - poetry run pytest --cov-report html --cov-report term --cov-report term-missing tests
 
 after_success:
-  - pipenv run coveralls
-  - pipenv run codecov
+  - poetry run coveralls
+  - poetry run codecov
diff --git a/MANIFEST.in b/MANIFEST.in
deleted file mode 100644
index 673b8ad..0000000
--- a/MANIFEST.in
+++ /dev/null
@@ -1 +0,0 @@
-include README.md LICENSE stilus/functions/index.styl
diff --git a/Makefile b/Makefile
deleted file mode 100644
index 3c4e5dc..0000000
--- a/Makefile
+++ /dev/null
@@ -1,3 +0,0 @@
-init:
-	pip install pipenv
-	pipenv install --dev
diff --git a/Pipfile b/Pipfile
deleted file mode 100644
index 8d2efb5..0000000
--- a/Pipfile
+++ /dev/null
@@ -1,31 +0,0 @@
-[[source]]
-url = "https://pypi.python.org/simple"
-verify_ssl = true
-name = "pypi"
-
-[packages]
-deprecated = "*"
-pyyaml = "*"
-click = "*"
-pillow = "*"
-beautifulsoup4 = "*"
-lxml = "*"
-watchdog = "*"
-
-[dev-packages]
-pytest = "*"
-ipython = "*"
-twine = "*"
-pytest-runner = "*"
-"flake8" = "*"
-pytest-cov = "*"
-sphinx = "*"
-codecov = "*"
-recommonmark = "*"
-commonmark = "*"
-pytest-icdiff = "*"
-coveralls = "*"
-python-coveralls = "*"
-
-[requires]
-python_version = "3.6"
diff --git a/Pipfile.lock b/Pipfile.lock
deleted file mode 100644
index a79c224..0000000
--- a/Pipfile.lock
+++ /dev/null
@@ -1,816 +0,0 @@
-{
-    "_meta": {
-        "hash": {
-            "sha256": "27d370fb16c19d992cd939032362e195839ca57ba53e3f575facece478a690eb"
-        },
-        "pipfile-spec": 6,
-        "requires": {
-            "python_version": "3.6"
-        },
-        "sources": [
-            {
-                "name": "pypi",
-                "url": "https://pypi.python.org/simple",
-                "verify_ssl": true
-            }
-        ]
-    },
-    "default": {
-        "argh": {
-            "hashes": [
-                "sha256:a9b3aaa1904eeb78e32394cd46c6f37ac0fb4af6dc488daa58971bdc7d7fcaf3",
-                "sha256:e9535b8c84dc9571a48999094fda7f33e63c3f1b74f3e5f3ac0105a58405bb65"
-            ],
-            "version": "==0.26.2"
-        },
-        "beautifulsoup4": {
-            "hashes": [
-                "sha256:5279c36b4b2ec2cb4298d723791467e3000e5384a43ea0cdf5d45207c7e97169",
-                "sha256:6135db2ba678168c07950f9a16c4031822c6f4aec75a65e0a97bc5ca09789931",
-                "sha256:dcdef580e18a76d54002088602eba453eec38ebbcafafeaabd8cab12b6155d57"
-            ],
-            "index": "pypi",
-            "version": "==4.8.1"
-        },
-        "click": {
-            "hashes": [
-                "sha256:2335065e6395b9e67ca716de5f7526736bfa6ceead690adf616d925bdc622b13",
-                "sha256:5b94b49521f6456670fdb30cd82a4eca9412788a93fa6dd6df72c94d5a8ff2d7"
-            ],
-            "index": "pypi",
-            "version": "==7.0"
-        },
-        "deprecated": {
-            "hashes": [
-                "sha256:408038ab5fdeca67554e8f6742d1521cd3cd0ee0ff9d47f29318a4f4da31c308",
-                "sha256:8b6a5aa50e482d8244a62e5582b96c372e87e3a28e8b49c316e46b95c76a611d"
-            ],
-            "index": "pypi",
-            "version": "==1.2.7"
-        },
-        "lxml": {
-            "hashes": [
-                "sha256:00ac0d64949fef6b3693813fe636a2d56d97a5a49b5bbb86e4cc4cc50ebc9ea2",
-                "sha256:0571e607558665ed42e450d7bf0e2941d542c18e117b1ebbf0ba72f287ad841c",
-                "sha256:0e3f04a7615fdac0be5e18b2406529521d6dbdb0167d2a690ee328bef7807487",
-                "sha256:13cf89be53348d1c17b453867da68704802966c433b2bb4fa1f970daadd2ef70",
-                "sha256:217262fcf6a4c2e1c7cb1efa08bd9ebc432502abc6c255c4abab611e8be0d14d",
-                "sha256:223e544828f1955daaf4cefbb4853bc416b2ec3fd56d4f4204a8b17007c21250",
-                "sha256:277cb61fede2f95b9c61912fefb3d43fbd5f18bf18a14fae4911b67984486f5d",
-                "sha256:3213f753e8ae86c396e0e066866e64c6b04618e85c723b32ecb0909885211f74",
-                "sha256:4690984a4dee1033da0af6df0b7a6bde83f74e1c0c870623797cec77964de34d",
-                "sha256:4fcc472ef87f45c429d3b923b925704aa581f875d65bac80f8ab0c3296a63f78",
-                "sha256:61409bd745a265a742f2693e4600e4dbd45cc1daebe1d5fad6fcb22912d44145",
-                "sha256:678f1963f755c5d9f5f6968dded7b245dd1ece8cf53c1aa9d80e6734a8c7f41d",
-                "sha256:6c6d03549d4e2734133badb9ab1c05d9f0ef4bcd31d83e5d2b4747c85cfa21da",
-                "sha256:6e74d5f4d6ecd6942375c52ffcd35f4318a61a02328f6f1bd79fcb4ffedf969e",
-                "sha256:7b4fc7b1ecc987ca7aaf3f4f0e71bbfbd81aaabf87002558f5bc95da3a865bcd",
-                "sha256:7ed386a40e172ddf44c061ad74881d8622f791d9af0b6f5be20023029129bc85",
-                "sha256:8f54f0924d12c47a382c600c880770b5ebfc96c9fd94cf6f6bdc21caf6163ea7",
-                "sha256:ad9b81351fdc236bda538efa6879315448411a81186c836d4b80d6ca8217cdb9",
-                "sha256:bbd00e21ea17f7bcc58dccd13869d68441b32899e89cf6cfa90d624a9198ce85",
-                "sha256:c3c289762cc09735e2a8f8a49571d0e8b4f57ea831ea11558247b5bdea0ac4db",
-                "sha256:cf4650942de5e5685ad308e22bcafbccfe37c54aa7c0e30cd620c2ee5c93d336",
-                "sha256:cfcbc33c9c59c93776aa41ab02e55c288a042211708b72fdb518221cc803abc8",
-                "sha256:e301055deadfedbd80cf94f2f65ff23126b232b0d1fea28f332ce58137bcdb18",
-                "sha256:ebbfe24df7f7b5c6c7620702496b6419f6a9aa2fd7f005eb731cc80d7b4692b9",
-                "sha256:eff69ddbf3ad86375c344339371168640951c302450c5d3e9936e98d6459db06",
-                "sha256:f6ed60a62c5f1c44e789d2cf14009423cb1646b44a43e40a9cf6a21f077678a1"
-            ],
-            "index": "pypi",
-            "version": "==4.4.2"
-        },
-        "pathtools": {
-            "hashes": [
-                "sha256:7c35c5421a39bb82e58018febd90e3b6e5db34c5443aaaf742b3f33d4655f1c0"
-            ],
-            "version": "==0.1.2"
-        },
-        "pillow": {
-            "hashes": [
-                "sha256:047d9473cf68af50ac85f8ee5d5f21a60f849bc17d348da7fc85711287a75031",
-                "sha256:0f66dc6c8a3cc319561a633b6aa82c44107f12594643efa37210d8c924fc1c71",
-                "sha256:12c9169c4e8fe0a7329e8658c7e488001f6b4c8e88740e76292c2b857af2e94c",
-                "sha256:248cffc168896982f125f5c13e9317c059f74fffdb4152893339f3be62a01340",
-                "sha256:27faf0552bf8c260a5cee21a76e031acaea68babb64daf7e8f2e2540745082aa",
-                "sha256:285edafad9bc60d96978ed24d77cdc0b91dace88e5da8c548ba5937c425bca8b",
-                "sha256:384b12c9aa8ef95558abdcb50aada56d74bc7cc131dd62d28c2d0e4d3aadd573",
-                "sha256:38950b3a707f6cef09cd3cbb142474357ad1a985ceb44d921bdf7b4647b3e13e",
-                "sha256:4aad1b88933fd6dc2846552b89ad0c74ddbba2f0884e2c162aa368374bf5abab",
-                "sha256:4ac6148008c169603070c092e81f88738f1a0c511e07bd2bb0f9ef542d375da9",
-                "sha256:4deb1d2a45861ae6f0b12ea0a786a03d19d29edcc7e05775b85ec2877cb54c5e",
-                "sha256:59aa2c124df72cc75ed72c8d6005c442d4685691a30c55321e00ed915ad1a291",
-                "sha256:5a47d2123a9ec86660fe0e8d0ebf0aa6bc6a17edc63f338b73ea20ba11713f12",
-                "sha256:5cc901c2ab9409b4b7ac7b5bcc3e86ac14548627062463da0af3b6b7c555a871",
-                "sha256:6c1db03e8dff7b9f955a0fb9907eb9ca5da75b5ce056c0c93d33100a35050281",
-                "sha256:7ce80c0a65a6ea90ef9c1f63c8593fcd2929448613fc8da0adf3e6bfad669d08",
-                "sha256:809c19241c14433c5d6135e1b6c72da4e3b56d5c865ad5736ab99af8896b8f41",
-                "sha256:83792cb4e0b5af480588601467c0764242b9a483caea71ef12d22a0d0d6bdce2",
-                "sha256:846fa202bd7ee0f6215c897a1d33238ef071b50766339186687bd9b7a6d26ac5",
-                "sha256:9f5529fc02009f96ba95bea48870173426879dc19eec49ca8e08cd63ecd82ddb",
-                "sha256:a423c2ea001c6265ed28700df056f75e26215fd28c001e93ef4380b0f05f9547",
-                "sha256:ac4428094b42907aba5879c7c000d01c8278d451a3b7cccd2103e21f6397ea75",
-                "sha256:b1ae48d87f10d1384e5beecd169c77502fcc04a2c00a4c02b85f0a94b419e5f9",
-                "sha256:bf4e972a88f8841d8fdc6db1a75e0f8d763e66e3754b03006cbc3854d89f1cb1",
-                "sha256:c6414f6aad598364aaf81068cabb077894eb88fed99c6a65e6e8217bab62ae7a",
-                "sha256:c710fcb7ee32f67baf25aa9ffede4795fd5d93b163ce95fdc724383e38c9df96",
-                "sha256:c7be4b8a09852291c3c48d3c25d1b876d2494a0a674980089ac9d5e0d78bd132",
-                "sha256:c9e5ffb910b14f090ac9c38599063e354887a5f6d7e6d26795e916b4514f2c1a",
-                "sha256:e0697b826da6c2472bb6488db4c0a7fa8af0d52fa08833ceb3681358914b14e5",
-                "sha256:e9a3edd5f714229d41057d56ac0f39ad9bdba6767e8c888c951869f0bdd129b0"
-            ],
-            "index": "pypi",
-            "version": "==6.2.1"
-        },
-        "pyyaml": {
-            "hashes": [
-                "sha256:0113bc0ec2ad727182326b61326afa3d1d8280ae1122493553fd6f4397f33df9",
-                "sha256:01adf0b6c6f61bd11af6e10ca52b7d4057dd0be0343eb9283c878cf3af56aee4",
-                "sha256:5124373960b0b3f4aa7df1707e63e9f109b5263eca5976c66e08b1c552d4eaf8",
-                "sha256:5ca4f10adbddae56d824b2c09668e91219bb178a1eee1faa56af6f99f11bf696",
-                "sha256:7907be34ffa3c5a32b60b95f4d95ea25361c951383a894fec31be7252b2b6f34",
-                "sha256:7ec9b2a4ed5cad025c2278a1e6a19c011c80a3caaac804fd2d329e9cc2c287c9",
-                "sha256:87ae4c829bb25b9fe99cf71fbb2140c448f534e24c998cc60f39ae4f94396a73",
-                "sha256:9de9919becc9cc2ff03637872a440195ac4241c80536632fffeb6a1e25a74299",
-                "sha256:a5a85b10e450c66b49f98846937e8cfca1db3127a9d5d1e31ca45c3d0bef4c5b",
-                "sha256:b0997827b4f6a7c286c01c5f60384d218dca4ed7d9efa945c3e1aa623d5709ae",
-                "sha256:b631ef96d3222e62861443cc89d6563ba3eeb816eeb96b2629345ab795e53681",
-                "sha256:bf47c0607522fdbca6c9e817a6e81b08491de50f3766a7a0e6a5be7905961b41",
-                "sha256:f81025eddd0327c7d4cfe9b62cf33190e1e736cc6e97502b3ec425f574b3e7a8"
-            ],
-            "index": "pypi",
-            "version": "==5.1.2"
-        },
-        "soupsieve": {
-            "hashes": [
-                "sha256:bdb0d917b03a1369ce964056fc195cfdff8819c40de04695a80bc813c3cfa1f5",
-                "sha256:e2c1c5dee4a1c36bcb790e0fabd5492d874b8ebd4617622c4f6a731701060dda"
-            ],
-            "version": "==1.9.5"
-        },
-        "watchdog": {
-            "hashes": [
-                "sha256:965f658d0732de3188211932aeb0bb457587f04f63ab4c1e33eab878e9de961d"
-            ],
-            "index": "pypi",
-            "version": "==0.9.0"
-        },
-        "wrapt": {
-            "hashes": [
-                "sha256:565a021fd19419476b9362b05eeaa094178de64f8361e44468f9e9d7843901e1"
-            ],
-            "version": "==1.11.2"
-        }
-    },
-    "develop": {
-        "alabaster": {
-            "hashes": [
-                "sha256:446438bdcca0e05bd45ea2de1668c1d9b032e1a9154c2c259092d77031ddd359",
-                "sha256:a661d72d58e6ea8a57f7a86e37d86716863ee5e92788398526d58b26a4e4dc02"
-            ],
-            "version": "==0.7.12"
-        },
-        "attrs": {
-            "hashes": [
-                "sha256:08a96c641c3a74e44eb59afb61a24f2cb9f4d7188748e76ba4bb5edfa3cb7d1c",
-                "sha256:f7b7ce16570fe9965acd6d30101a28f62fb4a7f9e926b3bbc9b61f8b04247e72"
-            ],
-            "version": "==19.3.0"
-        },
-        "babel": {
-            "hashes": [
-                "sha256:af92e6106cb7c55286b25b38ad7695f8b4efb36a90ba483d7f7a6628c46158ab",
-                "sha256:e86135ae101e31e2c8ec20a4e0c5220f4eed12487d5cf3f78be7e98d3a57fc28"
-            ],
-            "version": "==2.7.0"
-        },
-        "backcall": {
-            "hashes": [
-                "sha256:38ecd85be2c1e78f77fd91700c76e14667dc21e2713b63876c0eb901196e01e4",
-                "sha256:bbbf4b1e5cd2bdb08f915895b51081c041bac22394fdfcfdfbe9f14b77c08bf2"
-            ],
-            "version": "==0.1.0"
-        },
-        "bleach": {
-            "hashes": [
-                "sha256:213336e49e102af26d9cde77dd2d0397afabc5a6bf2fed985dc35b5d1e285a16",
-                "sha256:3fdf7f77adcf649c9911387df51254b813185e32b2c6619f690b593a617e19fa"
-            ],
-            "version": "==3.1.0"
-        },
-        "certifi": {
-            "hashes": [
-                "sha256:017c25db2a153ce562900032d5bc68e9f191e44e9a0f762f373977de9df1fbb3",
-                "sha256:25b64c7da4cd7479594d035c08c2d809eb4aab3a26e5a990ea98cc450c320f1f"
-            ],
-            "version": "==2019.11.28"
-        },
-        "cffi": {
-            "hashes": [
-                "sha256:0b49274afc941c626b605fb59b59c3485c17dc776dc3cc7cc14aca74cc19cc42",
-                "sha256:0e3ea92942cb1168e38c05c1d56b0527ce31f1a370f6117f1d490b8dcd6b3a04",
-                "sha256:135f69aecbf4517d5b3d6429207b2dff49c876be724ac0c8bf8e1ea99df3d7e5",
-                "sha256:19db0cdd6e516f13329cba4903368bff9bb5a9331d3410b1b448daaadc495e54",
-                "sha256:2781e9ad0e9d47173c0093321bb5435a9dfae0ed6a762aabafa13108f5f7b2ba",
-                "sha256:291f7c42e21d72144bb1c1b2e825ec60f46d0a7468f5346841860454c7aa8f57",
-                "sha256:2c5e309ec482556397cb21ede0350c5e82f0eb2621de04b2633588d118da4396",
-                "sha256:2e9c80a8c3344a92cb04661115898a9129c074f7ab82011ef4b612f645939f12",
-                "sha256:32a262e2b90ffcfdd97c7a5e24a6012a43c61f1f5a57789ad80af1d26c6acd97",
-                "sha256:3c9fff570f13480b201e9ab69453108f6d98244a7f495e91b6c654a47486ba43",
-                "sha256:415bdc7ca8c1c634a6d7163d43fb0ea885a07e9618a64bda407e04b04333b7db",
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-            "hashes": [
-                "sha256:2094eefdfcf37a1fdbfb9aa090862c1a4878e5c7e0e7e7088bdb511c558e5cd1",
-                "sha256:9e2c1fd0e6ee3a49b28f95d4b33bc389c89b20af6a1255906e90ff1262ce62eb"
-            ],
-            "markers": "sys_platform != 'win32'",
-            "version": "==4.7.0"
-        },
-        "pickleshare": {
-            "hashes": [
-                "sha256:87683d47965c1da65cdacaf31c8441d12b8044cdec9aca500cd78fc2c683afca",
-                "sha256:9649af414d74d4df115d5d718f82acb59c9d418196b7b4290ed47a12ce62df56"
-            ],
-            "version": "==0.7.5"
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-        "pkginfo": {
-            "hashes": [
-                "sha256:7424f2c8511c186cd5424bbf31045b77435b37a8d604990b79d4e70d741148bb",
-                "sha256:a6d9e40ca61ad3ebd0b72fbadd4fba16e4c0e4df0428c041e01e06eb6ee71f32"
-            ],
-            "version": "==1.5.0.1"
-        },
-        "pluggy": {
-            "hashes": [
-                "sha256:15b2acde666561e1298d71b523007ed7364de07029219b604cf808bfa1c765b0",
-                "sha256:966c145cd83c96502c3c3868f50408687b38434af77734af1e9ca461a4081d2d"
-            ],
-            "version": "==0.13.1"
-        },
-        "pprintpp": {
-            "hashes": [
-                "sha256:b6b4dcdd0c0c0d75e4d7b2f21a9e933e5b2ce62b26e1a54537f9651ae5a5c01d",
-                "sha256:ea826108e2c7f49dc6d66c752973c3fc9749142a798d6b254e1e301cfdbc6403"
-            ],
-            "version": "==0.4.0"
-        },
-        "prompt-toolkit": {
-            "hashes": [
-                "sha256:3f1e4acc78605c25f79992c2e5b3fe9a1c238a6444ae3f4b7d2678cfbd67a8f8",
-                "sha256:cf1fc1500e9818973c4f92b6015bece88253f0aa599dd61d3fd375c5205cecbb"
-            ],
-            "version": "==3.0.0"
-        },
-        "ptyprocess": {
-            "hashes": [
-                "sha256:923f299cc5ad920c68f2bc0bc98b75b9f838b93b599941a6b63ddbc2476394c0",
-                "sha256:d7cc528d76e76342423ca640335bd3633420dc1366f258cb31d05e865ef5ca1f"
-            ],
-            "version": "==0.6.0"
-        },
-        "py": {
-            "hashes": [
-                "sha256:64f65755aee5b381cea27766a3a147c3f15b9b6b9ac88676de66ba2ae36793fa",
-                "sha256:dc639b046a6e2cff5bbe40194ad65936d6ba360b52b3c3fe1d08a82dd50b5e53"
-            ],
-            "version": "==1.8.0"
-        },
-        "pycodestyle": {
-            "hashes": [
-                "sha256:95a2219d12372f05704562a14ec30bc76b05a5b297b21a5dfe3f6fac3491ae56",
-                "sha256:e40a936c9a450ad81df37f549d676d127b1b66000a6c500caa2b085bc0ca976c"
-            ],
-            "version": "==2.5.0"
-        },
-        "pycparser": {
-            "hashes": [
-                "sha256:a988718abfad80b6b157acce7bf130a30876d27603738ac39f140993246b25b3"
-            ],
-            "version": "==2.19"
-        },
-        "pyflakes": {
-            "hashes": [
-                "sha256:17dbeb2e3f4d772725c777fabc446d5634d1038f234e77343108ce445ea69ce0",
-                "sha256:d976835886f8c5b31d47970ed689944a0262b5f3afa00a5a7b4dc81e5449f8a2"
-            ],
-            "version": "==2.1.1"
-        },
-        "pygments": {
-            "hashes": [
-                "sha256:83ec6c6133ca6b529b7ff5aa826328fd14b5bb02a58c37f4f06384e96a0f94ab",
-                "sha256:b7949de3d396836085fea596998b135a22610bbcc4f2abfe9e448e44cbc58388"
-            ],
-            "version": "==2.5.1"
-        },
-        "pyparsing": {
-            "hashes": [
-                "sha256:20f995ecd72f2a1f4bf6b072b63b22e2eb457836601e76d6e5dfcd75436acc1f",
-                "sha256:4ca62001be367f01bd3e92ecbb79070272a9d4964dce6a48a82ff0b8bc7e683a"
-            ],
-            "version": "==2.4.5"
-        },
-        "pytest": {
-            "hashes": [
-                "sha256:63344a2e3bce2e4d522fd62b4fdebb647c019f1f9e4ca075debbd13219db4418",
-                "sha256:f67403f33b2b1d25a6756184077394167fe5e2f9d8bdaab30707d19ccec35427"
-            ],
-            "index": "pypi",
-            "version": "==5.3.1"
-        },
-        "pytest-cov": {
-            "hashes": [
-                "sha256:cc6742d8bac45070217169f5f72ceee1e0e55b0221f54bcf24845972d3a47f2b",
-                "sha256:cdbdef4f870408ebdbfeb44e63e07eb18bb4619fae852f6e760645fa36172626"
-            ],
-            "index": "pypi",
-            "version": "==2.8.1"
-        },
-        "pytest-icdiff": {
-            "hashes": [
-                "sha256:9ff97fb493085f8099a8a7f6161fd570fad96699f42dc08ffc66d04e8063862f"
-            ],
-            "index": "pypi",
-            "version": "==0.2"
-        },
-        "pytest-runner": {
-            "hashes": [
-                "sha256:5534b08b133ef9a5e2c22c7886a8f8508c95bb0b0bdc6cc13214f269c3c70d51",
-                "sha256:96c7e73ead7b93e388c5d614770d2bae6526efd997757d3543fe17b557a0942b"
-            ],
-            "index": "pypi",
-            "version": "==5.2"
-        },
-        "python-coveralls": {
-            "hashes": [
-                "sha256:bfaf7811e7dc5628e83b6b162962a4e2485dbff184b30e49f380374ed1bcee55",
-                "sha256:fb0ff49bb1551dac10b06bd55e9790287d898a0f1e2c959802235cae08dd0bff"
-            ],
-            "index": "pypi",
-            "version": "==2.9.3"
-        },
-        "pytz": {
-            "hashes": [
-                "sha256:1c557d7d0e871de1f5ccd5833f60fb2550652da6be2693c1e02300743d21500d",
-                "sha256:b02c06db6cf09c12dd25137e563b31700d3b80fcc4ad23abb7a315f2789819be"
-            ],
-            "version": "==2019.3"
-        },
-        "pyyaml": {
-            "hashes": [
-                "sha256:0113bc0ec2ad727182326b61326afa3d1d8280ae1122493553fd6f4397f33df9",
-                "sha256:01adf0b6c6f61bd11af6e10ca52b7d4057dd0be0343eb9283c878cf3af56aee4",
-                "sha256:5124373960b0b3f4aa7df1707e63e9f109b5263eca5976c66e08b1c552d4eaf8",
-                "sha256:5ca4f10adbddae56d824b2c09668e91219bb178a1eee1faa56af6f99f11bf696",
-                "sha256:7907be34ffa3c5a32b60b95f4d95ea25361c951383a894fec31be7252b2b6f34",
-                "sha256:7ec9b2a4ed5cad025c2278a1e6a19c011c80a3caaac804fd2d329e9cc2c287c9",
-                "sha256:87ae4c829bb25b9fe99cf71fbb2140c448f534e24c998cc60f39ae4f94396a73",
-                "sha256:9de9919becc9cc2ff03637872a440195ac4241c80536632fffeb6a1e25a74299",
-                "sha256:a5a85b10e450c66b49f98846937e8cfca1db3127a9d5d1e31ca45c3d0bef4c5b",
-                "sha256:b0997827b4f6a7c286c01c5f60384d218dca4ed7d9efa945c3e1aa623d5709ae",
-                "sha256:b631ef96d3222e62861443cc89d6563ba3eeb816eeb96b2629345ab795e53681",
-                "sha256:bf47c0607522fdbca6c9e817a6e81b08491de50f3766a7a0e6a5be7905961b41",
-                "sha256:f81025eddd0327c7d4cfe9b62cf33190e1e736cc6e97502b3ec425f574b3e7a8"
-            ],
-            "index": "pypi",
-            "version": "==5.1.2"
-        },
-        "readme-renderer": {
-            "hashes": [
-                "sha256:bb16f55b259f27f75f640acf5e00cf897845a8b3e4731b5c1a436e4b8529202f",
-                "sha256:c8532b79afc0375a85f10433eca157d6b50f7d6990f337fa498c96cd4bfc203d"
-            ],
-            "version": "==24.0"
-        },
-        "recommonmark": {
-            "hashes": [
-                "sha256:29cd4faeb6c5268c633634f2d69aef9431e0f4d347f90659fd0aab20e541efeb",
-                "sha256:2ec4207a574289355d5b6ae4ae4abb29043346ca12cdd5f07d374dc5987d2852"
-            ],
-            "index": "pypi",
-            "version": "==0.6.0"
-        },
-        "requests": {
-            "hashes": [
-                "sha256:11e007a8a2aa0323f5a921e9e6a2d7e4e67d9877e85773fba9ba6419025cbeb4",
-                "sha256:9cf5292fcd0f598c671cfc1e0d7d1a7f13bb8085e9a590f48c010551dc6c4b31"
-            ],
-            "version": "==2.22.0"
-        },
-        "requests-toolbelt": {
-            "hashes": [
-                "sha256:380606e1d10dc85c3bd47bf5a6095f815ec007be7a8b69c878507068df059e6f",
-                "sha256:968089d4584ad4ad7c171454f0a5c6dac23971e9472521ea3b6d49d610aa6fc0"
-            ],
-            "version": "==0.9.1"
-        },
-        "secretstorage": {
-            "hashes": [
-                "sha256:20c797ae48a4419f66f8d28fc221623f11fc45b6828f96bdb1ad9990acb59f92",
-                "sha256:7a119fb52a88e398dbb22a4b3eb39b779bfbace7e4153b7bc6e5954d86282a8a"
-            ],
-            "markers": "sys_platform == 'linux'",
-            "version": "==3.1.1"
-        },
-        "six": {
-            "hashes": [
-                "sha256:1f1b7d42e254082a9db6279deae68afb421ceba6158efa6131de7b3003ee93fd",
-                "sha256:30f610279e8b2578cab6db20741130331735c781b56053c59c4076da27f06b66"
-            ],
-            "version": "==1.13.0"
-        },
-        "snowballstemmer": {
-            "hashes": [
-                "sha256:209f257d7533fdb3cb73bdbd24f436239ca3b2fa67d56f6ff88e86be08cc5ef0",
-                "sha256:df3bac3df4c2c01363f3dd2cfa78cce2840a79b9f1c2d2de9ce8d31683992f52"
-            ],
-            "version": "==2.0.0"
-        },
-        "sphinx": {
-            "hashes": [
-                "sha256:31088dfb95359384b1005619827eaee3056243798c62724fd3fa4b84ee4d71bd",
-                "sha256:52286a0b9d7caa31efee301ec4300dbdab23c3b05da1c9024b4e84896fb73d79"
-            ],
-            "index": "pypi",
-            "version": "==2.2.1"
-        },
-        "sphinxcontrib-applehelp": {
-            "hashes": [
-                "sha256:edaa0ab2b2bc74403149cb0209d6775c96de797dfd5b5e2a71981309efab3897",
-                "sha256:fb8dee85af95e5c30c91f10e7eb3c8967308518e0f7488a2828ef7bc191d0d5d"
-            ],
-            "version": "==1.0.1"
-        },
-        "sphinxcontrib-devhelp": {
-            "hashes": [
-                "sha256:6c64b077937330a9128a4da74586e8c2130262f014689b4b89e2d08ee7294a34",
-                "sha256:9512ecb00a2b0821a146736b39f7aeb90759834b07e81e8cc23a9c70bacb9981"
-            ],
-            "version": "==1.0.1"
-        },
-        "sphinxcontrib-htmlhelp": {
-            "hashes": [
-                "sha256:4670f99f8951bd78cd4ad2ab962f798f5618b17675c35c5ac3b2132a14ea8422",
-                "sha256:d4fd39a65a625c9df86d7fa8a2d9f3cd8299a3a4b15db63b50aac9e161d8eff7"
-            ],
-            "version": "==1.0.2"
-        },
-        "sphinxcontrib-jsmath": {
-            "hashes": [
-                "sha256:2ec2eaebfb78f3f2078e73666b1415417a116cc848b72e5172e596c871103178",
-                "sha256:a9925e4a4587247ed2191a22df5f6970656cb8ca2bd6284309578f2153e0c4b8"
-            ],
-            "version": "==1.0.1"
-        },
-        "sphinxcontrib-qthelp": {
-            "hashes": [
-                "sha256:513049b93031beb1f57d4daea74068a4feb77aa5630f856fcff2e50de14e9a20",
-                "sha256:79465ce11ae5694ff165becda529a600c754f4bc459778778c7017374d4d406f"
-            ],
-            "version": "==1.0.2"
-        },
-        "sphinxcontrib-serializinghtml": {
-            "hashes": [
-                "sha256:c0efb33f8052c04fd7a26c0a07f1678e8512e0faec19f4aa8f2473a8b81d5227",
-                "sha256:db6615af393650bf1151a6cd39120c29abaf93cc60db8c48eb2dddbfdc3a9768"
-            ],
-            "version": "==1.1.3"
-        },
-        "tqdm": {
-            "hashes": [
-                "sha256:5a1f3d58f3eb53264387394387fe23df469d2a3fab98c9e7f99d5c146c119873",
-                "sha256:f1a1613fee07cc30a253051617f2a219a785c58877f9f6bfa129446cbaf8b4c1"
-            ],
-            "version": "==4.39.0"
-        },
-        "traitlets": {
-            "hashes": [
-                "sha256:70b4c6a1d9019d7b4f6846832288f86998aa3b9207c6821f3578a6a6a467fe44",
-                "sha256:d023ee369ddd2763310e4c3eae1ff649689440d4ae59d7485eb4cfbbe3e359f7"
-            ],
-            "version": "==4.3.3"
-        },
-        "twine": {
-            "hashes": [
-                "sha256:c1af8ca391e43b0a06bbc155f7f67db0bf0d19d284bfc88d1675da497a946124",
-                "sha256:d561a5e511f70275e5a485a6275ff61851c16ffcb3a95a602189161112d9f160"
-            ],
-            "index": "pypi",
-            "version": "==3.1.1"
-        },
-        "urllib3": {
-            "hashes": [
-                "sha256:a8a318824cc77d1fd4b2bec2ded92646630d7fe8619497b142c84a9e6f5a7293",
-                "sha256:f3c5fd51747d450d4dcf6f923c81f78f811aab8205fda64b0aba34a4e48b0745"
-            ],
-            "version": "==1.25.7"
-        },
-        "wcwidth": {
-            "hashes": [
-                "sha256:3df37372226d6e63e1b1e1eda15c594bca98a22d33a23832a90998faa96bc65e",
-                "sha256:f4ebe71925af7b40a864553f761ed559b43544f8f71746c2d756c7fe788ade7c"
-            ],
-            "version": "==0.1.7"
-        },
-        "webencodings": {
-            "hashes": [
-                "sha256:a0af1213f3c2226497a97e2b3aa01a7e4bee4f403f95be16fc9acd2947514a78",
-                "sha256:b36a1c245f2d304965eb4e0a82848379241dc04b865afcc4aab16748587e1923"
-            ],
-            "version": "==0.5.1"
-        },
-        "zipp": {
-            "hashes": [
-                "sha256:3718b1cbcd963c7d4c5511a8240812904164b7f381b647143a89d3b98f9bcd8e",
-                "sha256:f06903e9f1f43b12d371004b4ac7b06ab39a44adc747266928ae6debfa7b3335"
-            ],
-            "version": "==0.6.0"
-        }
-    }
-}
diff --git a/docs/conf.py b/docs/conf.py
index d718dc0..235cb1d 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -18,8 +18,8 @@
 
 sys.path.insert(0, os.path.abspath('../stilus'))
 
-from lexer import Lexer  # noqa
-from parser import Parser  # noqa
+from stilus.lexer import Lexer  # noqa
+from stilus.parser import Parser  # noqa
 from __version__ import __version__  # noqa
 
 import recommonmark  # noqa
diff --git a/docs/plan/current.md b/docs/plan/current.md
index e6b9968..37728c8 100644
--- a/docs/plan/current.md
+++ b/docs/plan/current.md
@@ -2,8 +2,10 @@
 
 The issues release, a.k.a. `issues, issues everywhere!`
 
- - [ ] Check the circle-ci setup.
+ - [x] Check the circle-ci setup.
+ - [x] Migrate from pipenv to poetry.
+ - [ ] Start using black.
  - [ ] Cleanup of coverall/codecov properties.
- - [ ] Update the assertions in the built-in functions.
- - [ ] Document using docstrings and Sphinx. 
- - [ ] Start using github issues.
+ - [ ] Document using docstrings and Sphinx.
+ - [x] Start using github issues.
+ - [ ] Clear all the issues with a 'test' label.]\
diff --git a/docs/plan/future.md b/docs/plan/future.md
index 7990aec..fb096a8 100644
--- a/docs/plan/future.md
+++ b/docs/plan/future.md
@@ -3,14 +3,17 @@
 ### 0.10.0
 
  - [ ] Create logo.
+ - [ ] Update the assertions in the built-in functions.
  - [ ] Use typing properly.
  - [ ] Start using github issues.
  - [ ] Add tests for `to_json()`, `equal()`, `coerce()`, `clone()` and `operate()` in all nodes?
  - [ ] Other things?
  - [ ] Update site to promote Stilus!
+ - [ ] Clean up the logging; improve the output.
+ - [ ] Extra options (--javascript, --stlus,...) can be added
 
 ### 1.0.0
 
-Last semantic versioning release; Stilus is ready!
-From now on calendar versioning will be used.
+At last!  Stilus is ready!
+Add calendar versioning to semantic version.
  
\ No newline at end of file
diff --git a/poetry.lock b/poetry.lock
new file mode 100644
index 0000000..52b6198
--- /dev/null
+++ b/poetry.lock
@@ -0,0 +1,1552 @@
+[[package]]
+category = "dev"
+description = "A configurable sidebar-enabled Sphinx theme"
+name = "alabaster"
+optional = false
+python-versions = "*"
+version = "0.7.12"
+
+[[package]]
+category = "dev"
+description = "Disable App Nap on OS X 10.9"
+marker = "sys_platform == \"darwin\""
+name = "appnope"
+optional = false
+python-versions = "*"
+version = "0.1.0"
+
+[[package]]
+category = "main"
+description = "An unobtrusive argparse wrapper with natural syntax"
+name = "argh"
+optional = false
+python-versions = "*"
+version = "0.26.2"
+
+[[package]]
+category = "dev"
+description = "Atomic file writes."
+marker = "sys_platform == \"win32\""
+name = "atomicwrites"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "1.3.0"
+
+[[package]]
+category = "dev"
+description = "Classes Without Boilerplate"
+name = "attrs"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "19.3.0"
+
+[package.extras]
+azure-pipelines = ["coverage", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface", "pytest-azurepipelines"]
+dev = ["coverage", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface", "sphinx", "pre-commit"]
+docs = ["sphinx", "zope.interface"]
+tests = ["coverage", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface"]
+
+[[package]]
+category = "dev"
+description = "Internationalization utilities"
+name = "babel"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "2.7.0"
+
+[package.dependencies]
+pytz = ">=2015.7"
+
+[[package]]
+category = "dev"
+description = "Specifications for callback functions passed in to an API"
+name = "backcall"
+optional = false
+python-versions = "*"
+version = "0.1.0"
+
+[[package]]
+category = "main"
+description = "Screen-scraping library"
+name = "beautifulsoup4"
+optional = false
+python-versions = "*"
+version = "4.8.2"
+
+[package.dependencies]
+soupsieve = ">=1.2"
+
+[package.extras]
+html5lib = ["html5lib"]
+lxml = ["lxml"]
+
+[[package]]
+category = "dev"
+description = "An easy safelist-based HTML-sanitizing tool."
+name = "bleach"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "3.1.0"
+
+[package.dependencies]
+six = ">=1.9.0"
+webencodings = "*"
+
+[[package]]
+category = "dev"
+description = "Python package for providing Mozilla's CA Bundle."
+name = "certifi"
+optional = false
+python-versions = "*"
+version = "2019.11.28"
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+    {file = "wrapt-1.11.2.tar.gz", hash = "sha256:565a021fd19419476b9362b05eeaa094178de64f8361e44468f9e9d7843901e1"},
+]
+zipp = [
+    {file = "zipp-0.6.0-py2.py3-none-any.whl", hash = "sha256:f06903e9f1f43b12d371004b4ac7b06ab39a44adc747266928ae6debfa7b3335"},
+    {file = "zipp-0.6.0.tar.gz", hash = "sha256:3718b1cbcd963c7d4c5511a8240812904164b7f381b647143a89d3b98f9bcd8e"},
+]
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..f0dd029
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,56 @@
+[tool.poetry]
+name = "stilus"
+version = "0.8.3"
+description = "A Stylus css compiler in Python."
+license = "GPL-3.0-or-later"
+authors = ["Jan Willems <jw@elevenbits.com>"]
+maintainers = ["Jan Willems <jw@elevenbits.com>"]
+readme = "README.md"
+homepage = "https://github.com/jw/stilus"
+repository = "https://github.com/jw/stilus"
+documentation = "https://stilus.readthedocs.io/en/latest/"
+keywords = ["compiler", "stylus", "css"]
+classifiers = [
+    'License :: OSI Approved :: GNU General Public License v3 or later (GPLv3+)',
+    'Programming Language :: Python',
+    'Programming Language :: Python :: 3',
+    'Programming Language :: Python :: 3.6',
+    'Programming Language :: Python :: 3.7',
+    'Programming Language :: Python :: 3.8',
+    'Programming Language :: Python :: Implementation :: CPython'
+    # 'Programming Language :: Python :: Implementation :: PyPy'
+]
+include = ['README.md', 'LICENSE', 'stilus/functions/index.styl']
+
+[tool.poetry.dependencies]
+python = "^3.6"
+deprecated = "*"
+pyyaml = "*"
+click = "*"
+pillow = "*"
+wheel = "*"
+watchdog = "^0.8.3"
+beautifulsoup4 = "*"
+lxml = "*"
+
+[tool.poetry.dev-dependencies]
+pytest = "*"
+ipython = "*"
+twine = "*"
+pytest-runner = "*"
+"flake8" = "*"
+pytest-cov = "*"
+sphinx = "*"
+codecov = "*"
+recommonmark = "*"
+commonmark = "*"
+pytest-icdiff = "*"
+coveralls = "*"
+python-coveralls = "*"
+
+[tool.poetry.scripts]
+stilus = "stilus.cli:stilus"
+
+[build-system]
+requires = ["poetry>=1.0.0"]
+build-backend = "poetry.masonry.api"
diff --git a/setup.cfg b/setup.cfg
deleted file mode 100644
index 1a8b98b..0000000
--- a/setup.cfg
+++ /dev/null
@@ -1,6 +0,0 @@
-[aliases]
-test=pytest
-
-[tool:pytest]
-addopts = --cov=stilus --cov-report html --cov-report term --cov-report term-missing --junitxml=test-reports/junit.xml
-python_files = tests/*.py
diff --git a/setup.py b/setup.py
deleted file mode 100644
index 7020f39..0000000
--- a/setup.py
+++ /dev/null
@@ -1,126 +0,0 @@
-#!/usr/bin/env python
-
-import io
-import os
-import sys
-from shutil import rmtree
-
-from setuptools import find_packages, setup, Command
-
-# Package meta-data.
-NAME = 'stilus'
-DESCRIPTION = 'A Stylus css compiler in Python.'
-URL = 'https://github.com/jw/stilus'
-EMAIL = 'jw@elevenbits.com'
-AUTHOR = 'Jan Willems'
-REQUIRES_PYTHON = '>=3.6.0'
-VERSION = None
-
-# todo: add this automatically from pipenv
-REQUIRED = [
-    'deprecated', 'pyyaml', 'click', 'pillow', 'beautifulsoup4', 'lxml'
-]
-
-# What packages are optional?
-EXTRAS = {
-    # 'fancy feature': ['django'],
-}
-
-here = os.path.abspath(os.path.dirname(__file__))
-
-# Import the README and use it as the long-description.
-# Note: this will only work if 'README.md' is present in your MANIFEST.in file!
-try:
-    with io.open(os.path.join(here, 'README.md'), encoding='utf-8') as f:
-        long_description = '\n' + f.read()
-except FileNotFoundError:
-    long_description = DESCRIPTION
-
-# Load the package's __version__.py module as a dictionary.
-about = {}
-if not VERSION:
-    with open(os.path.join(here, NAME, '__version__.py')) as f:
-        exec(f.read(), about)
-else:
-    about['__version__'] = VERSION
-
-
-class UploadCommand(Command):
-    """Support setup.py upload."""
-
-    description = 'Build and publish the package.'
-    user_options = []
-
-    @staticmethod
-    def status(s):
-        """Prints things in bold."""
-        print(f'\033[1m{s}\033[0m')
-
-    def initialize_options(self):
-        pass
-
-    def finalize_options(self):
-        pass
-
-    def run(self):
-        try:
-            self.status('Removing previous builds...')
-            rmtree(os.path.join(here, 'dist'))
-        except OSError:
-            pass
-
-        self.status('Building Source and Wheel (universal) distribution…')
-        os.system('{0} setup.py sdist bdist_wheel --universal'.format(
-            sys.executable))
-
-        self.status('Uploading the package to PyPI via Twine…')
-        os.system('twine upload dist/*')
-
-        self.status('Pushing git tags…')
-        os.system('git tag {0}'.format(about['__version__']))
-        os.system('git push --tags')
-
-        sys.exit()
-
-
-# Where the magic happens:
-setup(
-    name=NAME,
-    version=about['__version__'],
-    description=DESCRIPTION,
-    long_description=long_description,
-    long_description_content_type='text/markdown',
-    author=AUTHOR,
-    author_email=EMAIL,
-    python_requires=REQUIRES_PYTHON,
-    url=URL,
-    packages=find_packages(exclude=('tests',)),
-    # If your package is a single module, use this instead of 'packages':
-    # py_modules=['mypackage'],
-    entry_points={
-        'console_scripts': ['stilus=stilus.cli:stilus'],
-    },
-    install_requires=REQUIRED,
-    extras_require=EXTRAS,
-    include_package_data=True,
-    license='GPLv3+',
-    setup_requires=['pytest-runner'],
-    tests_require=['pytest'],
-    classifiers=[
-        # Trove classifiers
-        # Full list: https://pypi.python.org/pypi?%3Aaction=list_classifiers
-        'License :: OSI Approved :: GNU General Public License v3 or '
-        'later (GPLv3+)',
-        'Programming Language :: Python',
-        'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.6',
-        'Programming Language :: Python :: 3.7',
-        'Programming Language :: Python :: 3.8',
-        'Programming Language :: Python :: Implementation :: CPython'
-        # 'Programming Language :: Python :: Implementation :: PyPy'
-    ],
-    # $ setup.py publish support.
-    cmdclass={
-        'upload': UploadCommand,
-    },
-)
diff --git a/stilus/__version__.py b/stilus/__version__.py
index 3ce84f1..e845cbe 100644
--- a/stilus/__version__.py
+++ b/stilus/__version__.py
@@ -1,3 +1,3 @@
-VERSION = (0, 8, 0)
+VERSION = (0, 8, 3)
 
 __version__ = '.'.join(map(str, VERSION))
diff --git a/stilus/cli.py b/stilus/cli.py
index 6370a3d..7cc9442 100644
--- a/stilus/cli.py
+++ b/stilus/cli.py
@@ -11,8 +11,8 @@
 from watchdog.events import FileSystemEventHandler
 from watchdog.observers import Observer
 
-from __version__ import __version__
-from renderer import Renderer
+from .__version__ import __version__
+from .renderer import Renderer
 
 CONTEXT_SETTINGS = dict(help_option_names=['-h', '--help'])
 
@@ -34,8 +34,12 @@ def setup_logging(default_path='logging.yaml',
         logging.config.dictConfig(config)
         logging.debug(f'Using {p.resolve()} as logging configuration file.')
     else:
-        logging.basicConfig(level=default_level)
-        logging.warning('Using default logging configuration.')
+        # todo: handle these differently to comply with Stylus
+        logging.basicConfig(format='%(message)s', level=default_level)
+        logging.warning(f'Using default logging configuration (level'
+                        f' is {logging.getLevelName(default_level)}).')
+        logging.warning(f'Note: use STILUS_LOGGING_CONFIG to configure'
+                        f' the logging; or create a logging.yaml file.')
 
 
 setup_logging('bin/logging.yaml')
@@ -228,13 +232,13 @@ def on_modified(self, event):
     else:
         if not input:
             input = click.get_text_stream('stdin')
-            logging.info('Reading from stdin...')
+            logging.debug('Reading from stdin...')
         if not output:
             output = click.get_text_stream('stdout')
-            logging.info('Writing to stdout...')
+            logging.debug('Writing to stdout...')
         elif out:
             output = (Path(out) / Path(output.name)).open('w')
-            logging.info(f'Writing to {output}.')
+            logging.debug(f'Writing to {output}.')
         css = render(input.read(), include, compress, prefix, ha)
         if print_:
             click.echo(css, nl='\n' if compress else '')
diff --git a/stilus/functions/addProperty.py b/stilus/functions/addProperty.py
index 9bcd8a2..2946533 100644
--- a/stilus/functions/addProperty.py
+++ b/stilus/functions/addProperty.py
@@ -1,5 +1,5 @@
-from nodes.property import Property
-from utils import assert_type, unwrap, assert_string
+from stilus.nodes.property import Property
+from stilus.utils import assert_type, unwrap, assert_string
 
 
 def add_property(name, expr, evaluator=None):
diff --git a/stilus/functions/adjust.py b/stilus/functions/adjust.py
index b05bcd6..4a4f8ab 100644
--- a/stilus/functions/adjust.py
+++ b/stilus/functions/adjust.py
@@ -1,5 +1,5 @@
-from exceptions import StilusError
-from utils import assert_color, assert_string, assert_type
+from stilus.exceptions import StilusError
+from stilus.utils import assert_color, assert_string, assert_type
 
 
 def adjust(color, prop, amount, evaluator=None):
diff --git a/stilus/functions/alpha.py b/stilus/functions/alpha.py
index 7b24faf..fb6bec3 100644
--- a/stilus/functions/alpha.py
+++ b/stilus/functions/alpha.py
@@ -1,8 +1,8 @@
 from typing import Type
 
-from functions.rgba import rgba
-from nodes.color import Color, HSLA
-from nodes.unit import Unit
+from stilus.functions.rgba import rgba
+from stilus.nodes.color import Color, HSLA
+from stilus.nodes.unit import Unit
 
 
 def alpha(color: Type[Color], value=None, evaluator=None):
diff --git a/stilus/functions/baseConvert.py b/stilus/functions/baseConvert.py
index 7bb93bb..e29802c 100644
--- a/stilus/functions/baseConvert.py
+++ b/stilus/functions/baseConvert.py
@@ -1,6 +1,6 @@
-from nodes.expression import Expression
-from nodes.literal import Literal
-from utils import unwrap, assert_type
+from stilus.nodes.expression import Expression
+from stilus.nodes.literal import Literal
+from stilus.utils import unwrap, assert_type
 
 
 def _convert(num, base):
diff --git a/stilus/functions/basename.py b/stilus/functions/basename.py
index 8746f75..5540598 100644
--- a/stilus/functions/basename.py
+++ b/stilus/functions/basename.py
@@ -1,6 +1,6 @@
 from pathlib import Path
 
-from utils import assert_string
+from stilus.utils import assert_string
 
 
 def basename(p, ext=None, evaluator=None):
diff --git a/stilus/functions/bifs.py b/stilus/functions/bifs.py
index ededa05..21cd39c 100644
--- a/stilus/functions/bifs.py
+++ b/stilus/functions/bifs.py
@@ -1,6 +1,6 @@
-from functions import addProperty, adjust, alpha, baseConvert, basename, \
-    blend, blue, clone, contrast, convert, currentMedia, define, dirname, \
-    error, extname, green, hsl, hsla, hue, imageSize, json, length, \
+from stilus.functions import addProperty, adjust, alpha, baseConvert, \
+    basename, blend, blue, clone, contrast, convert, currentMedia, define, \
+    dirname, error, extname, green, hsl, hsla, hue, imageSize, json, length, \
     lightness, listSeparator, lookup, luminosity, match, math, math_prop, \
     merge, operate, oppositePosition, p, pathjoin, pop, prefixClasses, push, \
     range, red, remove, replace, rgb, rgba, s, saturation, \
diff --git a/stilus/functions/blend.py b/stilus/functions/blend.py
index 256241f..0dcd37a 100644
--- a/stilus/functions/blend.py
+++ b/stilus/functions/blend.py
@@ -1,5 +1,5 @@
-from nodes.color import RGBA
-from utils import assert_color
+from stilus.nodes.color import RGBA
+from stilus.utils import assert_color
 
 
 def blend(top, bottom=None, evaluator=None):
diff --git a/stilus/functions/blue.py b/stilus/functions/blue.py
index 3b97a61..3f50ff4 100644
--- a/stilus/functions/blue.py
+++ b/stilus/functions/blue.py
@@ -1,6 +1,6 @@
-from functions.rgba import rgba
-from nodes.color import Color, HSLA
-from nodes.unit import Unit
+from stilus.functions.rgba import rgba
+from stilus.nodes.color import Color, HSLA
+from stilus.nodes.unit import Unit
 
 
 def blue(color: Color, value: Unit = None, evaluator=None):
diff --git a/stilus/functions/clone.py b/stilus/functions/clone.py
index a9520a1..f1ca1e8 100644
--- a/stilus/functions/clone.py
+++ b/stilus/functions/clone.py
@@ -1,4 +1,4 @@
-from utils import assert_present
+from stilus.utils import assert_present
 
 
 def clone(expr, evaluator=None):
diff --git a/stilus/functions/component.py b/stilus/functions/component.py
index d9f9f4d..6c5ab7d 100644
--- a/stilus/functions/component.py
+++ b/stilus/functions/component.py
@@ -1,6 +1,6 @@
-from nodes.color import Color
-from utils import assert_color, assert_string
-from nodes.unit import Unit
+from stilus.nodes.color import Color
+from stilus.utils import assert_color, assert_string
+from stilus.nodes.unit import Unit
 
 component_map = {
     'red': 'r',
diff --git a/stilus/functions/contrast.py b/stilus/functions/contrast.py
index 898cbf2..1ce6e42 100644
--- a/stilus/functions/contrast.py
+++ b/stilus/functions/contrast.py
@@ -1,11 +1,11 @@
-from functions.blend import blend
-from functions.luminosity import luminosity
-from nodes.color import RGBA, Color
-from nodes.literal import Literal
-from nodes.null import Null
-from nodes.object_node import ObjectNode
-from nodes.unit import Unit
-from utils import assert_color, stilus_round
+from stilus.functions.blend import blend
+from stilus.functions.luminosity import luminosity
+from stilus.nodes.color import RGBA, Color
+from stilus.nodes.literal import Literal
+from stilus.nodes.null import Null
+from stilus.nodes.object_node import ObjectNode
+from stilus.nodes.unit import Unit
+from stilus.utils import assert_color, stilus_round
 
 
 def contrast(top: Color = None, bottom: Color = None, evaluator=None):
diff --git a/stilus/functions/convert.py b/stilus/functions/convert.py
index 7210492..57687d9 100644
--- a/stilus/functions/convert.py
+++ b/stilus/functions/convert.py
@@ -1,4 +1,4 @@
-from utils import assert_string, parse_string
+from stilus.utils import assert_string, parse_string
 
 
 def convert(str, evaluator=None):
diff --git a/stilus/functions/currentMedia.py b/stilus/functions/currentMedia.py
index 80a5617..2cf5100 100644
--- a/stilus/functions/currentMedia.py
+++ b/stilus/functions/currentMedia.py
@@ -1,4 +1,4 @@
-from nodes.string import String
+from stilus.nodes.string import String
 
 
 def current_media(*args, evaluator=None):
diff --git a/stilus/functions/define.py b/stilus/functions/define.py
index 6f1215f..180a9f4 100644
--- a/stilus/functions/define.py
+++ b/stilus/functions/define.py
@@ -1,6 +1,6 @@
-from nodes.ident import Ident
-from nodes.null import null
-from utils import assert_type, unwrap
+from stilus.nodes.ident import Ident
+from stilus.nodes.null import null
+from stilus.utils import assert_type, unwrap
 
 
 def define(name, expr, common=None, evaluator=None):
diff --git a/stilus/functions/dirname.py b/stilus/functions/dirname.py
index 0025fce..bf46a4a 100644
--- a/stilus/functions/dirname.py
+++ b/stilus/functions/dirname.py
@@ -1,6 +1,6 @@
 from pathlib import Path
 
-from utils import assert_string
+from stilus.utils import assert_string
 
 
 def dirname(p, evaluator=None):
diff --git a/stilus/functions/error.py b/stilus/functions/error.py
index f5959d6..6c5dc93 100644
--- a/stilus/functions/error.py
+++ b/stilus/functions/error.py
@@ -1,5 +1,5 @@
-from exceptions import StilusError
-from utils import assert_type
+from stilus.exceptions import StilusError
+from stilus.utils import assert_type
 
 
 def error(msg, evaluator=None):
diff --git a/stilus/functions/extname.py b/stilus/functions/extname.py
index a5fef0c..25f41c9 100644
--- a/stilus/functions/extname.py
+++ b/stilus/functions/extname.py
@@ -1,6 +1,6 @@
 from pathlib import Path
 
-from utils import assert_string
+from stilus.utils import assert_string
 
 
 def extname(p, evaluator=None):
diff --git a/stilus/functions/green.py b/stilus/functions/green.py
index 1fd6081..6afdf09 100644
--- a/stilus/functions/green.py
+++ b/stilus/functions/green.py
@@ -1,8 +1,8 @@
 from typing import Type
 
-from functions.rgba import rgba
-from nodes.color import Color, HSLA
-from nodes.unit import Unit
+from stilus.functions.rgba import rgba
+from stilus.nodes.color import Color, HSLA
+from stilus.nodes.unit import Unit
 
 
 def green(color: Type[Color], value=None, evaluator=None):
diff --git a/stilus/functions/hsl.py b/stilus/functions/hsl.py
index 999c937..1d8beab 100644
--- a/stilus/functions/hsl.py
+++ b/stilus/functions/hsl.py
@@ -1,6 +1,6 @@
-from nodes.unit import Unit
-from functions.hsla import hsla
-from utils import assert_color
+from stilus.nodes.unit import Unit
+from stilus.functions.hsla import hsla
+from stilus.utils import assert_color
 
 
 def hsl(hue, saturation=None, lightness=None, evaluator=None):
diff --git a/stilus/functions/hsla.py b/stilus/functions/hsla.py
index 10ab039..2b1d412 100644
--- a/stilus/functions/hsla.py
+++ b/stilus/functions/hsla.py
@@ -1,5 +1,5 @@
-from nodes.color import HSLA
-from utils import assert_color, assert_type
+from stilus.nodes.color import HSLA
+from stilus.utils import assert_color, assert_type
 
 
 def hsla(hue, saturation=None, lightness=None, alpha=None, evaluator=None):
diff --git a/stilus/functions/hue.py b/stilus/functions/hue.py
index 411b0e0..5f0f9a5 100644
--- a/stilus/functions/hue.py
+++ b/stilus/functions/hue.py
@@ -1,8 +1,8 @@
-from functions.component import component
-from functions.hsla import hsla
-from nodes.color import Color
-from nodes.string import String
-from nodes.unit import Unit
+from stilus.functions.component import component
+from stilus.functions.hsla import hsla
+from stilus.nodes.color import Color
+from stilus.nodes.string import String
+from stilus.nodes.unit import Unit
 
 
 def hue(color: Color, value=None, evaluator=None):
diff --git a/stilus/functions/imageSize.py b/stilus/functions/imageSize.py
index e009203..10dc6c3 100644
--- a/stilus/functions/imageSize.py
+++ b/stilus/functions/imageSize.py
@@ -3,10 +3,10 @@
 from PIL import Image
 from bs4 import BeautifulSoup
 
-from exceptions import StilusError
-from nodes.expression import Expression
-from nodes.unit import Unit
-from utils import assert_type, lookup
+from stilus.exceptions import StilusError
+from stilus.nodes.expression import Expression
+from stilus.nodes.unit import Unit
+from stilus.utils import assert_type, lookup
 
 
 def _x_and_y_from_svg(path):
diff --git a/stilus/functions/json.py b/stilus/functions/json.py
index 8acece8..7ae74ea 100644
--- a/stilus/functions/json.py
+++ b/stilus/functions/json.py
@@ -1,11 +1,11 @@
 import json
 
-from exceptions import StilusError
-from nodes.boolean import Boolean
-from nodes.ident import Ident
-from nodes.null import null
-from nodes.object_node import ObjectNode
-from utils import assert_string, coerce, lookup, parse_string
+from stilus.exceptions import StilusError
+from stilus.nodes.boolean import Boolean
+from stilus.nodes.ident import Ident
+from stilus.nodes.null import null
+from stilus.nodes.object_node import ObjectNode
+from stilus.utils import assert_string, coerce, lookup, parse_string
 
 
 # todo: this needs a cleaning
diff --git a/stilus/functions/length.py b/stilus/functions/length.py
index e6cb0e9..35dc500 100644
--- a/stilus/functions/length.py
+++ b/stilus/functions/length.py
@@ -1,4 +1,4 @@
-import utils
+from stilus import utils
 
 
 # todo: the *args is there due to javascript weirdness.
diff --git a/stilus/functions/lightness.py b/stilus/functions/lightness.py
index 76acff6..c4ba9a9 100644
--- a/stilus/functions/lightness.py
+++ b/stilus/functions/lightness.py
@@ -1,8 +1,8 @@
-from functions.component import component
-from functions.hsla import hsla
-from nodes.color import Color
-from nodes.string import String
-from nodes.unit import Unit
+from stilus.functions.component import component
+from stilus.functions.hsla import hsla
+from stilus.nodes.color import Color
+from stilus.nodes.string import String
+from stilus.nodes.unit import Unit
 
 
 def lightness(color: Color, value=None, evaluator=None):
diff --git a/stilus/functions/listSeparator.py b/stilus/functions/listSeparator.py
index 1630291..60d0955 100644
--- a/stilus/functions/listSeparator.py
+++ b/stilus/functions/listSeparator.py
@@ -1,5 +1,5 @@
-from nodes.string import String
-from utils import unwrap
+from stilus.nodes.string import String
+from stilus.utils import unwrap
 
 
 def list_separator(list, evaluator=None):
diff --git a/stilus/functions/lookup.py b/stilus/functions/lookup.py
index 561f40d..e26a40d 100644
--- a/stilus/functions/lookup.py
+++ b/stilus/functions/lookup.py
@@ -1,5 +1,5 @@
-from nodes.null import null
-from utils import assert_type
+from stilus.nodes.null import null
+from stilus.utils import assert_type
 
 
 def lookup(name, evaluator=None):
diff --git a/stilus/functions/luminosity.py b/stilus/functions/luminosity.py
index 6d71535..51149c7 100644
--- a/stilus/functions/luminosity.py
+++ b/stilus/functions/luminosity.py
@@ -1,6 +1,6 @@
-from nodes.color import Color
-from nodes.unit import Unit
-from utils import assert_color
+from stilus.nodes.color import Color
+from stilus.nodes.unit import Unit
+from stilus.utils import assert_color
 
 
 def luminosity(color: Color, evaluator=None):
diff --git a/stilus/functions/match.py b/stilus/functions/match.py
index d4c6ab6..b08f932 100644
--- a/stilus/functions/match.py
+++ b/stilus/functions/match.py
@@ -1,7 +1,7 @@
 import re
 
-import utils
-from utils import assert_type
+from stilus import utils
+from stilus.utils import assert_type
 
 
 def get_flags(flags=None):
@@ -23,7 +23,7 @@ def stilus_findall(pattern, string, flags=None):
         m = p.search(string)
         if m:
             return [m.group(0)] + list(m.groups())
-    from nodes.null import null
+    from stilus.nodes.null import null
     return null
 
 
diff --git a/stilus/functions/math.py b/stilus/functions/math.py
index ab11454..9a20cb1 100644
--- a/stilus/functions/math.py
+++ b/stilus/functions/math.py
@@ -1,8 +1,8 @@
 import math as m
 
-from nodes.string import String
-from nodes.unit import Unit
-from utils import assert_type, assert_string, stilus_round
+from stilus.nodes.string import String
+from stilus.nodes.unit import Unit
+from stilus.utils import assert_type, assert_string, stilus_round
 
 
 def math(n: Unit, fn: String, evaluator=None):
diff --git a/stilus/functions/math_prop.py b/stilus/functions/math_prop.py
index 1a260c2..1e9d7ee 100644
--- a/stilus/functions/math_prop.py
+++ b/stilus/functions/math_prop.py
@@ -1,7 +1,7 @@
 import math as m
 
-from nodes.string import String
-from nodes.unit import Unit
+from stilus.nodes.string import String
+from stilus.nodes.unit import Unit
 
 
 # todo: convert all javascript math functions to python and vice versa
diff --git a/stilus/functions/merge.py b/stilus/functions/merge.py
index 65e7ee7..002316a 100644
--- a/stilus/functions/merge.py
+++ b/stilus/functions/merge.py
@@ -1,5 +1,5 @@
-import utils
-from utils import assert_present, assert_type, unwrap
+from stilus import utils
+from stilus.utils import assert_present, assert_type, unwrap
 
 
 def merge(dest, *args, evaluator=None):
diff --git a/stilus/functions/operate.py b/stilus/functions/operate.py
index abe8349..467f261 100644
--- a/stilus/functions/operate.py
+++ b/stilus/functions/operate.py
@@ -1,4 +1,4 @@
-from utils import assert_present, assert_type
+from stilus.utils import assert_present, assert_type
 
 
 def operate(op=None, left=None, right=None, evaluator=None):
diff --git a/stilus/functions/oppositePosition.py b/stilus/functions/oppositePosition.py
index 1898b5f..1390079 100644
--- a/stilus/functions/oppositePosition.py
+++ b/stilus/functions/oppositePosition.py
@@ -1,8 +1,6 @@
-from nodes.literal import Literal
-
-
-import utils
-from exceptions import StilusError
+from stilus import utils
+from stilus.exceptions import StilusError
+from stilus.nodes.literal import Literal
 
 
 def opposite_position(positions, evaluator=None):
diff --git a/stilus/functions/p.py b/stilus/functions/p.py
index 8ec91ea..4a7ea50 100644
--- a/stilus/functions/p.py
+++ b/stilus/functions/p.py
@@ -1,5 +1,5 @@
-from nodes.null import null
-from utils import unwrap
+from stilus.nodes.null import null
+from stilus.utils import unwrap
 
 
 def p(*args, evaluator=None):
diff --git a/stilus/functions/pop.py b/stilus/functions/pop.py
index 853f4a2..5032ed1 100644
--- a/stilus/functions/pop.py
+++ b/stilus/functions/pop.py
@@ -1,5 +1,5 @@
-from nodes.null import null
-from utils import unwrap
+from stilus.nodes.null import null
+from stilus.utils import unwrap
 
 
 def pop(expr, *args, evaluator=None):
diff --git a/stilus/functions/prefixClasses.py b/stilus/functions/prefixClasses.py
index 3a9ce5e..2a65741 100644
--- a/stilus/functions/prefixClasses.py
+++ b/stilus/functions/prefixClasses.py
@@ -1,4 +1,4 @@
-from utils import assert_string, assert_type
+from stilus.utils import assert_string, assert_type
 
 
 def prefix_classes(prefix, block=None, evaluator=None):
diff --git a/stilus/functions/push.py b/stilus/functions/push.py
index ee88e08..1251d10 100644
--- a/stilus/functions/push.py
+++ b/stilus/functions/push.py
@@ -1,4 +1,4 @@
-from utils import unwrap
+from stilus.utils import unwrap
 
 
 def push(expr, *args, evaluator=None):
diff --git a/stilus/functions/range.py b/stilus/functions/range.py
index 60e0e19..e4c4581 100644
--- a/stilus/functions/range.py
+++ b/stilus/functions/range.py
@@ -1,7 +1,7 @@
-from exceptions import StilusError
-from nodes.expression import Expression
-from nodes.unit import Unit
-from utils import assert_type
+from stilus.exceptions import StilusError
+from stilus.nodes.expression import Expression
+from stilus.nodes.unit import Unit
+from stilus.utils import assert_type
 
 
 def range_function(start, stop, step=None, evaluator=None):
diff --git a/stilus/functions/red.py b/stilus/functions/red.py
index b31e679..46bb721 100644
--- a/stilus/functions/red.py
+++ b/stilus/functions/red.py
@@ -1,8 +1,8 @@
 from typing import Type
 
-from functions.rgba import rgba
-from nodes.color import Color, HSLA
-from nodes.unit import Unit
+from stilus.functions.rgba import rgba
+from stilus.nodes.color import Color, HSLA
+from stilus.nodes.unit import Unit
 
 
 def red(color: Type[Color], value=None, evaluator=None):
diff --git a/stilus/functions/remove.py b/stilus/functions/remove.py
index e80017f..f53da59 100644
--- a/stilus/functions/remove.py
+++ b/stilus/functions/remove.py
@@ -1,4 +1,4 @@
-from utils import assert_string, assert_type
+from stilus.utils import assert_string, assert_type
 
 
 def remove(object, key, evaluator=None):
diff --git a/stilus/functions/replace.py b/stilus/functions/replace.py
index 4bc227d..bf8694b 100644
--- a/stilus/functions/replace.py
+++ b/stilus/functions/replace.py
@@ -1,6 +1,6 @@
-from nodes.string import String
-from nodes.ident import Ident
-from utils import assert_string
+from stilus.nodes.string import String
+from stilus.nodes.ident import Ident
+from stilus.utils import assert_string
 
 
 def replace(pattern, replacement, value, evaluator=None):
diff --git a/stilus/functions/resolver.py b/stilus/functions/resolver.py
index e54bc56..4c055aa 100644
--- a/stilus/functions/resolver.py
+++ b/stilus/functions/resolver.py
@@ -1,12 +1,12 @@
 import inspect
 import logging
 from pathlib import Path
-
-import utils
-from nodes.literal import Literal
-from visitor.compiler import Compiler
 from urllib.parse import urlparse
 
+from stilus import utils
+from stilus.nodes.literal import Literal
+from stilus.visitor.compiler import Compiler
+
 log = logging.getLogger(__name__)
 
 
diff --git a/stilus/functions/rgb.py b/stilus/functions/rgb.py
index e873fc1..b395af3 100644
--- a/stilus/functions/rgb.py
+++ b/stilus/functions/rgb.py
@@ -1,7 +1,7 @@
-from functions.rgba import rgba
-from nodes.color import RGBA
-from nodes.unit import Unit
-from utils import assert_color
+from stilus.functions.rgba import rgba
+from stilus.nodes.color import RGBA
+from stilus.nodes.unit import Unit
+from stilus.utils import assert_color
 
 
 def rgb(red, green, blue, evaluator=None):
diff --git a/stilus/functions/rgba.py b/stilus/functions/rgba.py
index 4218400..f7fa7b1 100644
--- a/stilus/functions/rgba.py
+++ b/stilus/functions/rgba.py
@@ -1,5 +1,5 @@
-from nodes.color import RGBA
-from utils import assert_color, assert_type
+from stilus.nodes.color import RGBA
+from stilus.utils import assert_color, assert_type
 
 
 def rgba(red, green=None, blue=None, alpha=None, evaluator=None):
diff --git a/stilus/functions/s.py b/stilus/functions/s.py
index fa86b78..c686ed6 100644
--- a/stilus/functions/s.py
+++ b/stilus/functions/s.py
@@ -1,7 +1,7 @@
-from nodes.null import null
-from nodes.literal import Literal
-from utils import unwrap, assert_string
-from visitor.compiler import Compiler
+from stilus.nodes.literal import Literal
+from stilus.nodes.null import null
+from stilus.utils import assert_string, unwrap
+from stilus.visitor.compiler import Compiler
 
 
 def s(fmt, *args, evaluator=None):
@@ -11,7 +11,7 @@ def s(fmt, *args, evaluator=None):
     result = fmt.string
     results = []
     for arg in args:
-        from visitor.evaluator import Evaluator
+        from stilus.visitor.evaluator import Evaluator
         if not isinstance(arg, Evaluator):
             results.append(Compiler(arg, options).compile())
     for r in results:
diff --git a/stilus/functions/saturation.py b/stilus/functions/saturation.py
index f7d1ce2..8749ea3 100644
--- a/stilus/functions/saturation.py
+++ b/stilus/functions/saturation.py
@@ -1,8 +1,8 @@
-from functions.component import component
-from functions.hsla import hsla
-from nodes.color import Color
-from nodes.string import String
-from nodes.unit import Unit
+from stilus.functions.component import component
+from stilus.functions.hsla import hsla
+from stilus.nodes.color import Color
+from stilus.nodes.string import String
+from stilus.nodes.unit import Unit
 
 
 def saturation(color: Color, value=None, evaluator=None):
diff --git a/stilus/functions/selector.py b/stilus/functions/selector.py
index 39f6c08..69bf615 100644
--- a/stilus/functions/selector.py
+++ b/stilus/functions/selector.py
@@ -1,10 +1,9 @@
-
-from selector_parser import SelectorParser
-from utils import assert_string, compile_selectors, unwrap
+from stilus.selector_parser import SelectorParser
+from stilus.utils import assert_string, compile_selectors, unwrap
 
 
 def parse(selector):
-    from parser import Parser
+    from stilus.parser import Parser
     parser = Parser(selector, {})
     parser.state.append('selector-parts')
     nodes = parser.stmt_selector()
diff --git a/stilus/functions/selectorExists.py b/stilus/functions/selectorExists.py
index b3bfec8..534a401 100644
--- a/stilus/functions/selectorExists.py
+++ b/stilus/functions/selectorExists.py
@@ -1,5 +1,5 @@
-from utils import assert_string
-from visitor.normalizer import Normalizer
+from stilus.utils import assert_string
+from stilus.visitor.normalizer import Normalizer
 
 
 def selector_exists(selector, evaluator=None):
diff --git a/stilus/functions/selectors.py b/stilus/functions/selectors.py
index 506f30e..5aa185d 100644
--- a/stilus/functions/selectors.py
+++ b/stilus/functions/selectors.py
@@ -1,6 +1,6 @@
-from nodes.expression import Expression
-from nodes.string import String
-from selector_parser import SelectorParser
+from stilus.nodes.expression import Expression
+from stilus.nodes.string import String
+from stilus.selector_parser import SelectorParser
 
 
 def selectors(evaluator=None):
diff --git a/stilus/functions/shift.py b/stilus/functions/shift.py
index ac284ce..2dfc94c 100644
--- a/stilus/functions/shift.py
+++ b/stilus/functions/shift.py
@@ -1,5 +1,5 @@
-from nodes.null import null
-from utils import unwrap
+from stilus.nodes.null import null
+from stilus.utils import unwrap
 
 
 def shift(expr, *args, evaluator=None):
diff --git a/stilus/functions/stilus_slice.py b/stilus/functions/stilus_slice.py
index 48e527f..f06832a 100644
--- a/stilus/functions/stilus_slice.py
+++ b/stilus/functions/stilus_slice.py
@@ -1,7 +1,6 @@
-
-import utils
-from nodes.ident import Ident
-from nodes.string import String
+from stilus import utils
+from stilus.nodes.ident import Ident
+from stilus.nodes.string import String
 
 
 def slice(values, start, end=None, evaluator=None):
diff --git a/stilus/functions/stilus_split.py b/stilus/functions/stilus_split.py
index b402a6f..3580af7 100644
--- a/stilus/functions/stilus_split.py
+++ b/stilus/functions/stilus_split.py
@@ -1,7 +1,7 @@
-from nodes.expression import Expression
-from nodes.ident import Ident
-from nodes.string import String
-from utils import assert_string
+from stilus.nodes.expression import Expression
+from stilus.nodes.ident import Ident
+from stilus.nodes.string import String
+from stilus.utils import assert_string
 
 
 def split(delim, value, evaluator=None):
diff --git a/stilus/functions/substr.py b/stilus/functions/substr.py
index e893a1c..0e52063 100644
--- a/stilus/functions/substr.py
+++ b/stilus/functions/substr.py
@@ -1,6 +1,6 @@
-from nodes.ident import Ident
-from nodes.string import String
-from utils import assert_string, assert_type
+from stilus.nodes.ident import Ident
+from stilus.nodes.string import String
+from stilus.utils import assert_string, assert_type
 
 
 def substr(value, start, length=None, evaluator=None):
diff --git a/stilus/functions/tan.py b/stilus/functions/tan.py
index 2ea7fbf..d2f380e 100644
--- a/stilus/functions/tan.py
+++ b/stilus/functions/tan.py
@@ -1,6 +1,6 @@
 import math as m
-from nodes.unit import Unit
-from utils import assert_type, stilus_round
+from stilus.nodes.unit import Unit
+from stilus.utils import assert_type, stilus_round
 
 
 def tan(angle, evaluator=None):
diff --git a/stilus/functions/trace.py b/stilus/functions/trace.py
index 74890c6..2b5b3ec 100644
--- a/stilus/functions/trace.py
+++ b/stilus/functions/trace.py
@@ -1,6 +1,6 @@
 import logging
 
-from nodes.null import null
+from stilus.nodes.null import null
 
 log = logging.getLogger(__name__)
 
diff --git a/stilus/functions/transparentify.py b/stilus/functions/transparentify.py
index 14dab43..5dea524 100644
--- a/stilus/functions/transparentify.py
+++ b/stilus/functions/transparentify.py
@@ -1,6 +1,6 @@
-from nodes.color import RGBA
-from nodes.unit import Unit
-from utils import assert_color, assert_type
+from stilus.nodes.color import RGBA
+from stilus.nodes.unit import Unit
+from stilus.utils import assert_color, assert_type
 
 
 def best(top, bottom):
diff --git a/stilus/functions/unit.py b/stilus/functions/unit.py
index bd2ba5a..e9340d2 100644
--- a/stilus/functions/unit.py
+++ b/stilus/functions/unit.py
@@ -1,5 +1,5 @@
-from nodes.unit import Unit
-from utils import assert_string
+from stilus.nodes.unit import Unit
+from stilus.utils import assert_string
 
 
 def unit(unit, type=None, evaluator=None):
diff --git a/stilus/functions/unquote.py b/stilus/functions/unquote.py
index d3109dd..ec7f661 100644
--- a/stilus/functions/unquote.py
+++ b/stilus/functions/unquote.py
@@ -1,5 +1,5 @@
-from nodes.literal import Literal
-from utils import assert_string
+from stilus.nodes.literal import Literal
+from stilus.utils import assert_string
 
 
 def unquote(string, evaluator=None):
diff --git a/stilus/functions/unshift.py b/stilus/functions/unshift.py
index 2f168fd..b5ee78b 100644
--- a/stilus/functions/unshift.py
+++ b/stilus/functions/unshift.py
@@ -1,4 +1,4 @@
-from utils import unwrap
+from stilus.utils import unwrap
 
 
 def unshift(expr, *args, evaluator=None):
diff --git a/stilus/functions/url.py b/stilus/functions/url.py
index 1778278..ddc3a97 100644
--- a/stilus/functions/url.py
+++ b/stilus/functions/url.py
@@ -5,9 +5,9 @@
 from pathlib import Path
 from urllib.parse import urlparse
 
-import utils
-from nodes.literal import Literal
-from visitor.compiler import Compiler
+from stilus import utils
+from stilus.nodes.literal import Literal
+from stilus.visitor.compiler import Compiler
 
 default_mimes = {
     '.gif': 'image/gif',
diff --git a/stilus/functions/warn.py b/stilus/functions/warn.py
index 856531a..3662506 100644
--- a/stilus/functions/warn.py
+++ b/stilus/functions/warn.py
@@ -1,5 +1,5 @@
-from nodes import null
-from utils import assert_type
+from stilus.nodes import null
+from stilus.utils import assert_type
 
 import logging
 log = logging.getLogger(__name__)
diff --git a/stilus/lexer.py b/stilus/lexer.py
index df6f350..24bebad 100644
--- a/stilus/lexer.py
+++ b/stilus/lexer.py
@@ -1,14 +1,14 @@
 import re
 from collections import deque
 
-from nodes.boolean import Boolean
-from nodes.color import RGBA
-from nodes.null import null
-from nodes.string import String
-from nodes.unit import Unit
-from nodes.comment import Comment
-from nodes.ident import Ident
-from nodes.literal import Literal
+from .nodes.boolean import Boolean
+from .nodes.color import RGBA
+from .nodes.null import null
+from .nodes.string import String
+from .nodes.unit import Unit
+from .nodes.comment import Comment
+from .nodes.ident import Ident
+from .nodes.literal import Literal
 
 
 class Token:
diff --git a/stilus/nodes/arguments.py b/stilus/nodes/arguments.py
index ebe8682..e230a74 100644
--- a/stilus/nodes/arguments.py
+++ b/stilus/nodes/arguments.py
@@ -1,6 +1,6 @@
 import json
 
-from nodes.expression import Expression
+from .expression import Expression
 
 
 class Arguments(Expression):
diff --git a/stilus/nodes/atblock.py b/stilus/nodes/atblock.py
index 05f8e4d..60cdc99 100644
--- a/stilus/nodes/atblock.py
+++ b/stilus/nodes/atblock.py
@@ -1,6 +1,6 @@
 import json
 
-from nodes.node import Node
+from .node import Node
 
 
 class Atblock(Node):
diff --git a/stilus/nodes/atrule.py b/stilus/nodes/atrule.py
index 6e7f064..7b91a27 100644
--- a/stilus/nodes/atrule.py
+++ b/stilus/nodes/atrule.py
@@ -1,6 +1,6 @@
 import json
 
-from nodes.node import Node
+from .node import Node
 
 
 class Atrule(Node):
diff --git a/stilus/nodes/binop.py b/stilus/nodes/binop.py
index 6032381..997224b 100644
--- a/stilus/nodes/binop.py
+++ b/stilus/nodes/binop.py
@@ -1,7 +1,7 @@
 import json
 
-from nodes.node import Node
-from nodes.null import Null
+from .node import Node
+from .null import Null
 
 
 class BinOp(Node):
diff --git a/stilus/nodes/block.py b/stilus/nodes/block.py
index 1f7c2c2..d9b3f1a 100644
--- a/stilus/nodes/block.py
+++ b/stilus/nodes/block.py
@@ -1,6 +1,6 @@
 import json
 
-from nodes.node import Node
+from .node import Node
 
 
 class Block(Node):
diff --git a/stilus/nodes/boolean.py b/stilus/nodes/boolean.py
index 71b3236..cd86c26 100644
--- a/stilus/nodes/boolean.py
+++ b/stilus/nodes/boolean.py
@@ -1,12 +1,12 @@
 import json
 
-from nodes.node import Node
+from .node import Node
 
 
 class Boolean(Node):
 
     def __init__(self, value: bool, lineno=1, column=1):
-        from nodes.null import null
+        from .null import null
         if value == null:
             value = False
         super().__init__(bool(value), lineno=lineno, column=column)
diff --git a/stilus/nodes/call.py b/stilus/nodes/call.py
index 672e067..ae46f73 100644
--- a/stilus/nodes/call.py
+++ b/stilus/nodes/call.py
@@ -1,7 +1,7 @@
 import json
 
-from nodes.arguments import Arguments
-from nodes.node import Node
+from .arguments import Arguments
+from .node import Node
 
 
 class Call(Node):
diff --git a/stilus/nodes/chartset.py b/stilus/nodes/chartset.py
index 3f5b829..83568c2 100644
--- a/stilus/nodes/chartset.py
+++ b/stilus/nodes/chartset.py
@@ -1,6 +1,6 @@
 import json
 
-from nodes.node import Node
+from .node import Node
 
 
 class Charset(Node):
diff --git a/stilus/nodes/color.py b/stilus/nodes/color.py
index 42586d0..ff49f06 100644
--- a/stilus/nodes/color.py
+++ b/stilus/nodes/color.py
@@ -1,12 +1,12 @@
 import colorsys
 import json
 
-from functions.adjust import adjust
-from nodes.string import String
-from nodes.unit import Unit
-from nodes.boolean import true, Boolean
-from nodes.node import Node
-from utils import clamp, clamp_alpha, clamp_degrees, clamp_percentage
+from stilus.functions.adjust import adjust
+from stilus.utils import clamp, clamp_alpha, clamp_degrees, clamp_percentage
+from .boolean import Boolean, true
+from .node import Node
+from .string import String
+from .unit import Unit
 
 
 class Color(Node):
diff --git a/stilus/nodes/comment.py b/stilus/nodes/comment.py
index b7e67ab..0d8ccad 100644
--- a/stilus/nodes/comment.py
+++ b/stilus/nodes/comment.py
@@ -1,6 +1,6 @@
 import json
 
-from nodes.node import Node
+from .node import Node
 
 
 class Comment(Node):
diff --git a/stilus/nodes/each.py b/stilus/nodes/each.py
index b11e17d..2b20fa4 100644
--- a/stilus/nodes/each.py
+++ b/stilus/nodes/each.py
@@ -1,6 +1,6 @@
 import json
 
-from nodes.node import Node
+from .node import Node
 
 
 class Each(Node):
diff --git a/stilus/nodes/expression.py b/stilus/nodes/expression.py
index a9af7d2..c0488fb 100644
--- a/stilus/nodes/expression.py
+++ b/stilus/nodes/expression.py
@@ -1,8 +1,8 @@
 import json
 
-import utils
-from nodes.boolean import Boolean
-from nodes.node import Node
+from stilus import utils
+from .boolean import Boolean
+from .node import Node
 
 
 class Expression(Node):
@@ -55,7 +55,7 @@ def first(self):
         if not self.is_empty():
             return self.nodes[0].first()
         else:
-            from nodes.null import null
+            from .null import null
             return null
 
     def clone(self, parent=None, node=None):
@@ -91,7 +91,7 @@ def operate(self, op, right, value=None):
                     index = utils.get_value(node)
                     last = len(self.nodes) - 1
                     for i in range(last, index):
-                        from nodes.null import null
+                        from stilus.nodes.null import null
                         self.nodes.append(null)
                     self.nodes[index] = value
                 elif node.string:
@@ -115,7 +115,7 @@ def operate(self, op, right, value=None):
                     n = values[0].get(node.string)
                 if n:
                     expression.append(n)
-            from nodes.null import null
+            from .null import null
             return null if expression.is_empty() else utils.unwrap(expression)
         elif op == '||':
             return self if self.to_boolean().value is True else right
diff --git a/stilus/nodes/extend.py b/stilus/nodes/extend.py
index 2125a47..1e0455e 100644
--- a/stilus/nodes/extend.py
+++ b/stilus/nodes/extend.py
@@ -1,6 +1,6 @@
 import json
 
-from nodes.node import Node
+from .node import Node
 
 
 class Extend(Node):
diff --git a/stilus/nodes/feature.py b/stilus/nodes/feature.py
index 72e4e9b..4db9cfa 100644
--- a/stilus/nodes/feature.py
+++ b/stilus/nodes/feature.py
@@ -1,6 +1,6 @@
 import json
 
-from nodes.node import Node
+from .node import Node
 
 
 class Feature(Node):
diff --git a/stilus/nodes/function.py b/stilus/nodes/function.py
index 3f723da..09f308c 100644
--- a/stilus/nodes/function.py
+++ b/stilus/nodes/function.py
@@ -1,7 +1,7 @@
 import json
 
-from functions.bifs import bifs
-from nodes.node import Node
+from stilus.functions.bifs import bifs
+from .node import Node
 
 
 class Function(Node):
diff --git a/stilus/nodes/group.py b/stilus/nodes/group.py
index 216d594..0b3f63a 100644
--- a/stilus/nodes/group.py
+++ b/stilus/nodes/group.py
@@ -1,8 +1,8 @@
 import json
 
-from nodes.block import Block
-from nodes.node import Node
-from nodes.selector import Selector
+from .block import Block
+from .node import Node
+from .selector import Selector
 
 
 class Group(Node):
diff --git a/stilus/nodes/ident.py b/stilus/nodes/ident.py
index 92f1784..1b69ead 100644
--- a/stilus/nodes/ident.py
+++ b/stilus/nodes/ident.py
@@ -1,6 +1,6 @@
 import json
 
-from nodes.node import Node
+from .node import Node
 
 
 class Ident(Node):
@@ -11,7 +11,7 @@ def __init__(self, name, value=None, mixin=False,
         self.name = name
         self.string = name
         # todo: clean this up
-        from nodes.null import null
+        from stilus.nodes.null import null
         self.value = null if value is None else value
         self.mixin = mixin
         self.property = None
@@ -75,7 +75,7 @@ def operate(self, op, right, value=None):
         value = right.first()
         if op == '-':
             if value.node_name == 'unit':
-                from nodes.expression import Expression
+                from stilus.nodes.expression import Expression
                 expression = Expression()
                 value = value.clone()
                 value.value = -value.value
diff --git a/stilus/nodes/ifnode.py b/stilus/nodes/ifnode.py
index 5e8e132..e1f958d 100644
--- a/stilus/nodes/ifnode.py
+++ b/stilus/nodes/ifnode.py
@@ -1,6 +1,6 @@
 import json
 
-from nodes.node import Node
+from .node import Node
 
 
 class If(Node):
diff --git a/stilus/nodes/import_node.py b/stilus/nodes/import_node.py
index 22f1541..e6678f8 100644
--- a/stilus/nodes/import_node.py
+++ b/stilus/nodes/import_node.py
@@ -1,6 +1,6 @@
 import json
 
-from nodes.node import Node
+from .node import Node
 
 
 class Import(Node):
diff --git a/stilus/nodes/keyframes.py b/stilus/nodes/keyframes.py
index 6397e19..b56432b 100644
--- a/stilus/nodes/keyframes.py
+++ b/stilus/nodes/keyframes.py
@@ -1,6 +1,6 @@
 import json
 
-from nodes.atrule import Atrule
+from .atrule import Atrule
 
 
 class Keyframes(Atrule):
diff --git a/stilus/nodes/literal.py b/stilus/nodes/literal.py
index 5a313d6..f73d98c 100644
--- a/stilus/nodes/literal.py
+++ b/stilus/nodes/literal.py
@@ -1,6 +1,6 @@
 import json
 
-from nodes.node import Node
+from .node import Node
 
 
 class Literal(Node):
diff --git a/stilus/nodes/media.py b/stilus/nodes/media.py
index cf3978d..23ebe3d 100644
--- a/stilus/nodes/media.py
+++ b/stilus/nodes/media.py
@@ -1,6 +1,6 @@
 import json
 
-from nodes.atrule import Atrule
+from .atrule import Atrule
 
 
 class Media(Atrule):
diff --git a/stilus/nodes/member.py b/stilus/nodes/member.py
index 6839785..283acfa 100644
--- a/stilus/nodes/member.py
+++ b/stilus/nodes/member.py
@@ -1,6 +1,6 @@
 import json
 
-from nodes.node import Node
+from .node import Node
 
 
 class Member(Node):
diff --git a/stilus/nodes/namespace.py b/stilus/nodes/namespace.py
index c22a2ee..dbec6bf 100644
--- a/stilus/nodes/namespace.py
+++ b/stilus/nodes/namespace.py
@@ -1,6 +1,6 @@
 import json
 
-from nodes.node import Node
+from .node import Node
 
 
 class Namespace(Node):
diff --git a/stilus/nodes/node.py b/stilus/nodes/node.py
index d69dd33..42f432e 100644
--- a/stilus/nodes/node.py
+++ b/stilus/nodes/node.py
@@ -1,6 +1,6 @@
 import json
 from typing import Type
-from exceptions import StilusError
+from stilus.exceptions import StilusError
 
 
 # todo: move this one to the stilus exceptions
@@ -48,14 +48,14 @@ def to_boolean(self):
         """Return True.
         :return: True
         """
-        from nodes.boolean import Boolean
+        from .boolean import Boolean
         return Boolean(True)
 
     def to_expression(self):
         """Return expression or wrap this node in an expression
         :return:
         """
-        from nodes.expression import Expression
+        from stilus.nodes.expression import Expression
         if self.node_name == 'expression':
             return self
         expression = Expression()
@@ -74,7 +74,7 @@ def one_is_unit(self, other):
 
     def operate(self, op: str, right: Type['Node'], value=None) -> 'Node':
         """Operate on ``right`` with the given ``op``."""
-        from nodes.boolean import Boolean
+        from .boolean import Boolean
         if op == 'is a':
             if 'string' == right.first().node_name:
                 return Boolean(self.node_name == right.value)
@@ -82,7 +82,7 @@ def operate(self, op: str, right: Type['Node'], value=None) -> 'Node':
                 raise Exception(f'"is a" expects a string, '
                                 f'got {right.toString}')
         elif op == '==':
-            import utils
+            from stilus import utils
             if utils.is_number(self) and utils.is_number(right):
                 return Boolean(utils.get_value(self) ==
                                utils.get_value(right))
@@ -102,7 +102,7 @@ def operate(self, op: str, right: Type['Node'], value=None) -> 'Node':
         elif op == '||':
             return self if self.to_boolean().value is True else right
         elif op == 'in':
-            import utils
+            from stilus import utils
             values = utils.unwrap(right).nodes
             if not values:
                 raise StilusError('"in" given invalid right-hand operand, '
diff --git a/stilus/nodes/nothing.py b/stilus/nodes/nothing.py
index 53038a1..fa574e1 100644
--- a/stilus/nodes/nothing.py
+++ b/stilus/nodes/nothing.py
@@ -1,6 +1,6 @@
 import json
 
-from nodes.node import Node
+from .node import Node
 
 
 class Nothing(Node):
diff --git a/stilus/nodes/null.py b/stilus/nodes/null.py
index 594d3cb..031ddb1 100644
--- a/stilus/nodes/null.py
+++ b/stilus/nodes/null.py
@@ -1,6 +1,6 @@
 import json
 
-from nodes.node import Node
+from .node import Node
 
 
 class Null(Node):
@@ -40,7 +40,7 @@ def to_expression(self):
         return super().to_expression()
 
     def to_boolean(self):
-        from nodes.boolean import false
+        from .boolean import false
         return false
 
     def to_json(self):
diff --git a/stilus/nodes/object_node.py b/stilus/nodes/object_node.py
index de29407..7c8ebbd 100644
--- a/stilus/nodes/object_node.py
+++ b/stilus/nodes/object_node.py
@@ -1,8 +1,8 @@
 import json
 
-from nodes.boolean import Boolean, false
-from nodes.node import Node
-from nodes.null import null
+from .boolean import Boolean, false
+from .node import Node
+from .null import null
 
 
 class ObjectNode(Node):
diff --git a/stilus/nodes/params.py b/stilus/nodes/params.py
index 43965f7..238baa5 100644
--- a/stilus/nodes/params.py
+++ b/stilus/nodes/params.py
@@ -1,6 +1,6 @@
 import json
 
-from nodes.node import Node
+from .node import Node
 
 
 class Params(Node):
diff --git a/stilus/nodes/property.py b/stilus/nodes/property.py
index 4c9b9ae..8e3aa9a 100644
--- a/stilus/nodes/property.py
+++ b/stilus/nodes/property.py
@@ -1,6 +1,6 @@
 import json
 
-from nodes.node import Node
+from .node import Node
 
 
 class Property(Node):
diff --git a/stilus/nodes/query.py b/stilus/nodes/query.py
index 261b259..ddcb44f 100644
--- a/stilus/nodes/query.py
+++ b/stilus/nodes/query.py
@@ -1,6 +1,6 @@
 import json
 
-from nodes.node import Node
+from .node import Node
 
 
 class Query(Node):
diff --git a/stilus/nodes/query_list.py b/stilus/nodes/query_list.py
index d33b40f..272d07e 100644
--- a/stilus/nodes/query_list.py
+++ b/stilus/nodes/query_list.py
@@ -1,6 +1,6 @@
 import json
 
-from nodes.node import Node
+from .node import Node
 
 
 class QueryList(Node):
diff --git a/stilus/nodes/return_node.py b/stilus/nodes/return_node.py
index b5ed9f6..5c4bb54 100644
--- a/stilus/nodes/return_node.py
+++ b/stilus/nodes/return_node.py
@@ -1,7 +1,7 @@
 import json
 
-from nodes.expression import Expression
-from nodes.node import Node
+from .expression import Expression
+from .node import Node
 
 
 class ReturnNode(Node, Exception):
diff --git a/stilus/nodes/root.py b/stilus/nodes/root.py
index 075975b..ad472f0 100644
--- a/stilus/nodes/root.py
+++ b/stilus/nodes/root.py
@@ -1,7 +1,7 @@
 import json
 
-from nodes.block import Block
-from nodes.node import Node
+from .block import Block
+from .node import Node
 
 
 class Root(Node):
diff --git a/stilus/nodes/selector.py b/stilus/nodes/selector.py
index c13fd7c..455ee64 100644
--- a/stilus/nodes/selector.py
+++ b/stilus/nodes/selector.py
@@ -1,6 +1,6 @@
 import json
 
-from nodes.node import Node
+from .node import Node
 
 
 class Selector(Node):
diff --git a/stilus/nodes/string.py b/stilus/nodes/string.py
index 5c0745e..a1cbd09 100644
--- a/stilus/nodes/string.py
+++ b/stilus/nodes/string.py
@@ -1,9 +1,9 @@
 import json
 
-import utils
-from nodes.boolean import Boolean
-from nodes.expression import Expression
-from nodes.node import Node
+from stilus import utils
+from .boolean import Boolean
+from .expression import Expression
+from .node import Node
 
 
 class String(Node):
@@ -62,7 +62,7 @@ def operate(self, op, right, value=None):
             else:
                 args = [right]
             # apply
-            from functions.s import s
+            from stilus.functions.s import s
             if hasattr(args, 'nodes'):
                 return s(expr, *args.nodes)
             else:
diff --git a/stilus/nodes/supports.py b/stilus/nodes/supports.py
index 1945c75..20401f6 100644
--- a/stilus/nodes/supports.py
+++ b/stilus/nodes/supports.py
@@ -1,6 +1,6 @@
 import json
 
-from nodes.atrule import Atrule
+from .atrule import Atrule
 
 
 class Supports(Atrule):
diff --git a/stilus/nodes/ternary.py b/stilus/nodes/ternary.py
index dd6956f..98c40cb 100644
--- a/stilus/nodes/ternary.py
+++ b/stilus/nodes/ternary.py
@@ -1,6 +1,6 @@
 import json
 
-from nodes.node import Node
+from .node import Node
 
 
 class Ternary(Node):
diff --git a/stilus/nodes/unaryop.py b/stilus/nodes/unaryop.py
index 963a18c..9a0e967 100644
--- a/stilus/nodes/unaryop.py
+++ b/stilus/nodes/unaryop.py
@@ -1,6 +1,6 @@
 import json
 
-from nodes.node import Node
+from .node import Node
 
 
 class UnaryOp(Node):
diff --git a/stilus/nodes/unit.py b/stilus/nodes/unit.py
index bff0345..1412a36 100644
--- a/stilus/nodes/unit.py
+++ b/stilus/nodes/unit.py
@@ -1,8 +1,8 @@
 import json
 
-from nodes.boolean import Boolean
-from nodes.expression import Expression
-from nodes.node import Node
+from .boolean import Boolean
+from .expression import Expression
+from .node import Node
 
 FACTOR_TABLE = {'mm': {'value': 1, 'label': 'mm'},
                 'cm': {'value': 10, 'label': 'mm'},
diff --git a/stilus/parser.py b/stilus/parser.py
index dda9496..dc81c20 100644
--- a/stilus/parser.py
+++ b/stilus/parser.py
@@ -1,45 +1,45 @@
 import logging
 from collections import deque
 
-from exceptions import ParseError
-from lexer import Lexer, Token
-from nodes.arguments import Arguments
-from nodes.atblock import Atblock
-from nodes.atrule import Atrule
-from nodes.binop import BinOp
-from nodes.block import Block
-from nodes.boolean import true
-from nodes.call import Call
-from nodes.chartset import Charset
-from nodes.each import Each
-from nodes.expression import Expression
-from nodes.extend import Extend
-from nodes.feature import Feature
-from nodes.function import Function
-from nodes.group import Group
-from nodes.ident import Ident
-from nodes.ifnode import If
-from nodes.import_node import Import
-from nodes.keyframes import Keyframes
-from nodes.literal import Literal
-from nodes.media import Media
-from nodes.member import Member
-from nodes.namespace import Namespace
-from nodes.node import Node
-from nodes.nothing import Nothing
-from nodes.null import null
-from nodes.object_node import ObjectNode
-from nodes.params import Params
-from nodes.property import Property
-from nodes.query import Query
-from nodes.query_list import QueryList
-from nodes.return_node import ReturnNode
-from nodes.root import Root
-from nodes.selector import Selector
-from nodes.supports import Supports
-from nodes.ternary import Ternary
-from nodes.unaryop import UnaryOp
-from units import units
+from .exceptions import ParseError
+from .lexer import Lexer, Token
+from .nodes.arguments import Arguments
+from .nodes.atblock import Atblock
+from .nodes.atrule import Atrule
+from .nodes.binop import BinOp
+from .nodes.block import Block
+from .nodes.boolean import true
+from .nodes.call import Call
+from .nodes.chartset import Charset
+from .nodes.each import Each
+from .nodes.expression import Expression
+from .nodes.extend import Extend
+from .nodes.feature import Feature
+from .nodes.function import Function
+from .nodes.group import Group
+from .nodes.ident import Ident
+from .nodes.ifnode import If
+from .nodes.import_node import Import
+from .nodes.keyframes import Keyframes
+from .nodes.literal import Literal
+from .nodes.media import Media
+from .nodes.member import Member
+from .nodes.namespace import Namespace
+from .nodes.node import Node
+from .nodes.nothing import Nothing
+from .nodes.null import null
+from .nodes.object_node import ObjectNode
+from .nodes.params import Params
+from .nodes.property import Property
+from .nodes.query import Query
+from .nodes.query_list import QueryList
+from .nodes.return_node import ReturnNode
+from .nodes.root import Root
+from .nodes.selector import Selector
+from .nodes.supports import Supports
+from .nodes.ternary import Ternary
+from .nodes.unaryop import UnaryOp
+from .units import units
 
 log = logging.getLogger(__name__)
 
diff --git a/stilus/renderer.py b/stilus/renderer.py
index 55f5ee0..4b4a73f 100644
--- a/stilus/renderer.py
+++ b/stilus/renderer.py
@@ -1,8 +1,8 @@
-from parser import Parser
-from utils import coerce
-from visitor.compiler import Compiler
-from visitor.evaluator import Evaluator
-from visitor.normalizer import Normalizer
+from .parser import Parser
+from .utils import coerce
+from .visitor.compiler import Compiler
+from .visitor.evaluator import Evaluator
+from .visitor.normalizer import Normalizer
 
 
 class Renderer:
diff --git a/stilus/stack/frame.py b/stilus/stack/frame.py
index adc5329..894b413 100644
--- a/stilus/stack/frame.py
+++ b/stilus/stack/frame.py
@@ -1,7 +1,7 @@
 from deprecated import deprecated
 
-from nodes.block import Block
-from stack.scope import Scope
+from stilus.nodes.block import Block
+from stilus.stack.scope import Scope
 
 
 # todo: create getter and setter for scope or at least clean this up!
diff --git a/stilus/stack/scope.py b/stilus/stack/scope.py
index 11fdec9..c7e695a 100644
--- a/stilus/stack/scope.py
+++ b/stilus/stack/scope.py
@@ -1,7 +1,7 @@
 from typing import Type
 
-from nodes.ident import Ident
-from nodes.node import Node
+from stilus.nodes.ident import Ident
+from stilus.nodes.node import Node
 
 
 class Scope:
diff --git a/stilus/stack/stack.py b/stilus/stack/stack.py
index 1b40625..8c68cad 100644
--- a/stilus/stack/stack.py
+++ b/stilus/stack/stack.py
@@ -1,8 +1,8 @@
 from typing import Type
 
-from nodes.block import Block
-from nodes.node import Node
-from stack.frame import Frame
+from stilus.nodes.block import Block
+from stilus.nodes.node import Node
+from stilus.stack.frame import Frame
 
 
 class Stack(list):
diff --git a/stilus/utils.py b/stilus/utils.py
index bc13c83..2a6d140 100644
--- a/stilus/utils.py
+++ b/stilus/utils.py
@@ -7,15 +7,15 @@
 from pathlib import Path
 from typing import List
 
-from nodes.boolean import Boolean
-from nodes.expression import Expression
-from nodes.literal import Literal
-from nodes.node import Node
-from nodes.null import null, Null
-from nodes.object_node import ObjectNode
-from nodes.string import String
-from nodes.unit import Unit
-from selector_parser import SelectorParser
+from .nodes.boolean import Boolean
+from .nodes.expression import Expression
+from .nodes.literal import Literal
+from .nodes.node import Node
+from .nodes.null import null, Null
+from .nodes.object_node import ObjectNode
+from .nodes.string import String
+from .nodes.unit import Unit
+from .selector_parser import SelectorParser
 
 
 def unwrap(expression: Expression) -> Node:
@@ -294,7 +294,7 @@ def coerce(value, raw: bool, lineno=1, column=1):
 
 
 def parse_string(str: String):
-    from parser import Parser
+    from stilus.parser import Parser
     try:
         parser = Parser(str, {})
         result = parser.list()
diff --git a/stilus/visitor/compiler.py b/stilus/visitor/compiler.py
index 306bdbe..d988588 100644
--- a/stilus/visitor/compiler.py
+++ b/stilus/visitor/compiler.py
@@ -1,23 +1,21 @@
 import re
-from os.path import dirname, abspath
-
-from exceptions import StilusError
-
-import utils
-
-from nodes.block import Block
-from nodes.boolean import Boolean
-from nodes.call import Call
-from nodes.expression import Expression
-from nodes.group import Group
-from nodes.ident import Ident
-from nodes.media import Media
-from nodes.node import Node
-from nodes.property import Property
-from nodes.root import Root
-from nodes.string import String
-from nodes.unit import Unit, has_many_zeros_and_a_number
-from visitor.visitor import Visitor
+from os.path import abspath, dirname
+
+from stilus import utils
+from stilus.exceptions import StilusError
+from stilus.nodes.block import Block
+from stilus.nodes.boolean import Boolean
+from stilus.nodes.call import Call
+from stilus.nodes.expression import Expression
+from stilus.nodes.group import Group
+from stilus.nodes.ident import Ident
+from stilus.nodes.media import Media
+from stilus.nodes.node import Node
+from stilus.nodes.property import Property
+from stilus.nodes.root import Root
+from stilus.nodes.string import String
+from stilus.nodes.unit import Unit, has_many_zeros_and_a_number
+from stilus.visitor.visitor import Visitor
 
 
 # fixme: this method should not be called
diff --git a/stilus/visitor/evaluator.py b/stilus/visitor/evaluator.py
index 8556c11..2ab8690 100644
--- a/stilus/visitor/evaluator.py
+++ b/stilus/visitor/evaluator.py
@@ -4,36 +4,36 @@
 import re
 from pathlib import Path
 
-import utils
-from colors import colors
-from exceptions import ParseError, StilusError
-from functions.bifs import bifs, raw_bifs
-from nodes import node as filename_node
-from nodes.arguments import Arguments
-from nodes.block import Block
-from nodes.boolean import Boolean, false
-from nodes.call import Call
-from nodes.color import RGBA
-from nodes.expression import Expression
-from nodes.function import Function
-from nodes.group import Group
-from nodes.ident import Ident
-from nodes.import_node import Import
-from nodes.literal import Literal
-from nodes.node import CoercionError
-from nodes.null import null
-from nodes.object_node import ObjectNode
-from nodes.return_node import ReturnNode
-from nodes.root import Root
-from nodes.string import String
-from nodes.unit import Unit
-from parser import Parser
-from stack.frame import Frame
-from stack.scope import Scope
-from stack.stack import Stack
-from units import units
-from utils import unwrap
-from visitor.visitor import Visitor
+from stilus import utils
+from stilus.colors import colors
+from stilus.exceptions import ParseError, StilusError
+from stilus.functions.bifs import bifs, raw_bifs
+from stilus.nodes import node as filename_node
+from stilus.nodes.arguments import Arguments
+from stilus.nodes.block import Block
+from stilus.nodes.boolean import Boolean, false
+from stilus.nodes.call import Call
+from stilus.nodes.color import RGBA
+from stilus.nodes.expression import Expression
+from stilus.nodes.function import Function
+from stilus.nodes.group import Group
+from stilus.nodes.ident import Ident
+from stilus.nodes.import_node import Import
+from stilus.nodes.literal import Literal
+from stilus.nodes.node import CoercionError
+from stilus.nodes.null import null
+from stilus.nodes.object_node import ObjectNode
+from stilus.nodes.return_node import ReturnNode
+from stilus.nodes.root import Root
+from stilus.nodes.string import String
+from stilus.nodes.unit import Unit
+from stilus.parser import Parser
+from stilus.stack.frame import Frame
+from stilus.stack.scope import Scope
+from stilus.stack.stack import Stack
+from stilus.units import units
+from stilus.utils import unwrap
+from stilus.visitor.visitor import Visitor
 
 log = logging.getLogger(__name__)
 
diff --git a/stilus/visitor/normalizer.py b/stilus/visitor/normalizer.py
index a0e0ace..45d9b6b 100644
--- a/stilus/visitor/normalizer.py
+++ b/stilus/visitor/normalizer.py
@@ -1,15 +1,15 @@
 import re
 from collections import defaultdict
 
-import utils
-from nodes.block import Block
-from nodes.group import Group
-from nodes.literal import Literal
-from nodes.node import Node
-from nodes.null import null
-from nodes.root import Root
-from nodes.selector import Selector
-from visitor.visitor import Visitor
+from stilus import utils
+from stilus.nodes.block import Block
+from stilus.nodes.group import Group
+from stilus.nodes.literal import Literal
+from stilus.nodes.node import Node
+from stilus.nodes.null import null
+from stilus.nodes.root import Root
+from stilus.nodes.selector import Selector
+from stilus.visitor.visitor import Visitor
 
 import logging
 log = logging.getLogger(__name__)
diff --git a/stilus/visitor/visitor.py b/stilus/visitor/visitor.py
index 1fc18fd..8954ca1 100644
--- a/stilus/visitor/visitor.py
+++ b/stilus/visitor/visitor.py
@@ -1,4 +1,4 @@
-from nodes.node import Node
+from stilus.nodes.node import Node
 
 import logging
 log = logging.getLogger(__name__)
diff --git a/tests/functions/test_component.py b/tests/functions/test_component.py
index 35d060d..e832344 100644
--- a/tests/functions/test_component.py
+++ b/tests/functions/test_component.py
@@ -1,7 +1,7 @@
-from functions.component import component
-from nodes.color import RGBA, HSLA
-from nodes.string import String
-from nodes.unit import Unit
+from stilus.functions.component import component
+from stilus.nodes.color import RGBA, HSLA
+from stilus.nodes.string import String
+from stilus.nodes.unit import Unit
 
 
 def test_component_hsla_hue():
diff --git a/tests/functions/test_hsla.py b/tests/functions/test_hsla.py
index 1aeb4e6..af65473 100644
--- a/tests/functions/test_hsla.py
+++ b/tests/functions/test_hsla.py
@@ -1,6 +1,6 @@
-from functions.hsla import hsla
-from nodes.color import HSLA
-from nodes.unit import Unit
+from stilus.functions.hsla import hsla
+from stilus.nodes.color import HSLA
+from stilus.nodes.unit import Unit
 
 
 def test_hsla_color():
diff --git a/tests/functions/test_hue.py b/tests/functions/test_hue.py
index 35a261b..06f82f6 100644
--- a/tests/functions/test_hue.py
+++ b/tests/functions/test_hue.py
@@ -1,6 +1,6 @@
-from functions.hue import hue
-from nodes.color import HSLA
-from nodes.unit import Unit
+from stilus.functions.hue import hue
+from stilus.nodes.color import HSLA
+from stilus.nodes.unit import Unit
 
 
 def test_hue():
diff --git a/tests/functions/test_lightness.py b/tests/functions/test_lightness.py
index 408f40c..b5ca547 100644
--- a/tests/functions/test_lightness.py
+++ b/tests/functions/test_lightness.py
@@ -1,6 +1,6 @@
-from functions.lightness import lightness
-from nodes.color import HSLA
-from nodes.unit import Unit
+from stilus.functions.lightness import lightness
+from stilus.nodes.color import HSLA
+from stilus.nodes.unit import Unit
 
 
 def test_lightness():
diff --git a/tests/functions/test_match.py b/tests/functions/test_match.py
index 7f8b3fe..546ae52 100644
--- a/tests/functions/test_match.py
+++ b/tests/functions/test_match.py
@@ -1,6 +1,6 @@
-from functions.match import match
-from nodes.null import null
-from nodes.string import String
+from stilus.functions.match import match
+from stilus.nodes.null import null
+from stilus.nodes.string import String
 
 
 def test_match():
diff --git a/tests/functions/test_saturation.py b/tests/functions/test_saturation.py
index b589214..a697f4c 100644
--- a/tests/functions/test_saturation.py
+++ b/tests/functions/test_saturation.py
@@ -1,6 +1,6 @@
-from functions.saturation import saturation
-from nodes.color import HSLA
-from nodes.unit import Unit
+from stilus.functions.saturation import saturation
+from stilus.nodes.color import HSLA
+from stilus.nodes.unit import Unit
 
 
 def test_saturation():
diff --git a/tests/nodes/test_arguments.py b/tests/nodes/test_arguments.py
index fc488ac..558d7fb 100644
--- a/tests/nodes/test_arguments.py
+++ b/tests/nodes/test_arguments.py
@@ -1,7 +1,7 @@
-from nodes.arguments import Arguments
-from nodes.boolean import true
-from nodes.expression import Expression
-from nodes.unit import Unit
+from stilus.nodes.arguments import Arguments
+from stilus.nodes.boolean import true
+from stilus.nodes.expression import Expression
+from stilus.nodes.unit import Unit
 
 
 def test_arguments():
diff --git a/tests/nodes/test_atblock.py b/tests/nodes/test_atblock.py
index eb12cd9..ead21b8 100644
--- a/tests/nodes/test_atblock.py
+++ b/tests/nodes/test_atblock.py
@@ -1,8 +1,8 @@
-from nodes.atblock import Atblock
-from nodes.block import Block
-from nodes.boolean import true
-from nodes.node import Node
-from nodes.null import null
+from stilus.nodes.atblock import Atblock
+from stilus.nodes.block import Block
+from stilus.nodes.boolean import true
+from stilus.nodes.node import Node
+from stilus.nodes.null import null
 
 
 def test_atblock():
diff --git a/tests/nodes/test_atrule.py b/tests/nodes/test_atrule.py
index f33c450..e22d60d 100644
--- a/tests/nodes/test_atrule.py
+++ b/tests/nodes/test_atrule.py
@@ -1,4 +1,4 @@
-from nodes.atrule import Atrule
+from stilus.nodes.atrule import Atrule
 
 
 def test_atrule():
diff --git a/tests/nodes/test_binop.py b/tests/nodes/test_binop.py
index d243613..bb178c5 100644
--- a/tests/nodes/test_binop.py
+++ b/tests/nodes/test_binop.py
@@ -1,5 +1,5 @@
-from nodes.binop import BinOp
-from nodes.expression import Expression
+from stilus.nodes.binop import BinOp
+from stilus.nodes.expression import Expression
 
 
 def test_binop():
diff --git a/tests/nodes/test_block.py b/tests/nodes/test_block.py
index d8b85ae..ec69946 100644
--- a/tests/nodes/test_block.py
+++ b/tests/nodes/test_block.py
@@ -1,12 +1,12 @@
-from nodes.block import Block
-from nodes.boolean import true
-from nodes.comment import Comment
-from nodes.expression import Expression
-from nodes.literal import Literal
-from nodes.media import Media
-from nodes.null import null
-from nodes.property import Property
-from nodes.string import String
+from stilus.nodes.block import Block
+from stilus.nodes.boolean import true
+from stilus.nodes.comment import Comment
+from stilus.nodes.expression import Expression
+from stilus.nodes.literal import Literal
+from stilus.nodes.media import Media
+from stilus.nodes.null import null
+from stilus.nodes.property import Property
+from stilus.nodes.string import String
 
 
 def test_block():
diff --git a/tests/nodes/test_boolean.py b/tests/nodes/test_boolean.py
index b1da638..ffc9085 100644
--- a/tests/nodes/test_boolean.py
+++ b/tests/nodes/test_boolean.py
@@ -1,4 +1,4 @@
-from nodes.boolean import Boolean, true, false
+from stilus.nodes.boolean import Boolean, true, false
 
 
 def test_is_true():
diff --git a/tests/nodes/test_call.py b/tests/nodes/test_call.py
index bd4949d..ec09a92 100644
--- a/tests/nodes/test_call.py
+++ b/tests/nodes/test_call.py
@@ -1,4 +1,4 @@
-from nodes.call import Call
+from stilus.nodes.call import Call
 
 
 def test_call():
diff --git a/tests/nodes/test_color.py b/tests/nodes/test_color.py
index 0e649e2..017a9fa 100644
--- a/tests/nodes/test_color.py
+++ b/tests/nodes/test_color.py
@@ -1,4 +1,4 @@
-from nodes.color import HSLA, RGBA
+from stilus.nodes.color import HSLA, RGBA
 
 
 def test_hsla():
diff --git a/tests/nodes/test_comment.py b/tests/nodes/test_comment.py
index 9cd889d..c5604e7 100644
--- a/tests/nodes/test_comment.py
+++ b/tests/nodes/test_comment.py
@@ -1,4 +1,4 @@
-from nodes.comment import Comment
+from stilus.nodes.comment import Comment
 
 
 def test_comment():
diff --git a/tests/nodes/test_each.py b/tests/nodes/test_each.py
index bfb2972..10f16d9 100644
--- a/tests/nodes/test_each.py
+++ b/tests/nodes/test_each.py
@@ -1,7 +1,7 @@
-from nodes.block import Block
-from nodes.each import Each
-from nodes.expression import Expression
-from nodes.node import Node
+from stilus.nodes.block import Block
+from stilus.nodes.each import Each
+from stilus.nodes.expression import Expression
+from stilus.nodes.node import Node
 
 
 def test_property():
diff --git a/tests/nodes/test_expression.py b/tests/nodes/test_expression.py
index ecedafe..c33be4a 100644
--- a/tests/nodes/test_expression.py
+++ b/tests/nodes/test_expression.py
@@ -1,14 +1,14 @@
 import pytest
-from exceptions import StilusError
 
-from nodes.boolean import Boolean
-from nodes.expression import Expression
-from nodes.ident import Ident
+from stilus.exceptions import StilusError
+from stilus.nodes.boolean import Boolean
+from stilus.nodes.expression import Expression
+from stilus.nodes.ident import Ident
 
 
 def test_empty_expression():
-    from nodes.null import null
-    from nodes.boolean import false
+    from stilus.nodes.null import null
+    from stilus.nodes.boolean import false
     expression = Expression()
     assert len(expression) == 0
     assert expression.is_empty()
@@ -38,9 +38,9 @@ def test_expression_make_is_list_and_preserve():
 
 
 def test_expression_append():
-    from nodes.null import null
-    from nodes.boolean import true
-    from nodes.boolean import false
+    from stilus.nodes.null import null
+    from stilus.nodes.boolean import true
+    from stilus.nodes.boolean import false
     expression = Expression()
     expression.append(null)
     expression.append(true)
@@ -49,9 +49,9 @@ def test_expression_append():
 
 
 def test_expression_string_first_boolean():
-    from nodes.boolean import true
-    from nodes.boolean import false
-    from nodes.null import null
+    from stilus.nodes.boolean import true
+    from stilus.nodes.boolean import false
+    from stilus.nodes.null import null
     expression = Expression()
     expression.append(true)
     expression.append(false)
@@ -98,9 +98,9 @@ def test_expression_hash():
     other_expression.append(Ident('foo'))
     other_expression.append(Ident('bar'))
     assert other_expression.hash() == 'foo::bar'
-    from nodes.null import null
-    from nodes.boolean import true
-    from nodes.boolean import false
+    from stilus.nodes.null import null
+    from stilus.nodes.boolean import true
+    from stilus.nodes.boolean import false
     expression = Expression()
     expression.append(null)
     expression.append(true)
diff --git a/tests/nodes/test_feature.py b/tests/nodes/test_feature.py
index 537d140..959e234 100644
--- a/tests/nodes/test_feature.py
+++ b/tests/nodes/test_feature.py
@@ -1,6 +1,6 @@
-from nodes.expression import Expression
-from nodes.feature import Feature
-from nodes.ident import Ident
+from stilus.nodes.expression import Expression
+from stilus.nodes.feature import Feature
+from stilus.nodes.ident import Ident
 
 
 def test_feature():
diff --git a/tests/nodes/test_function.py b/tests/nodes/test_function.py
index 95144a7..7a186c7 100644
--- a/tests/nodes/test_function.py
+++ b/tests/nodes/test_function.py
@@ -1,4 +1,4 @@
-from nodes.function import Function
+from stilus.nodes.function import Function
 
 
 def test_function():
diff --git a/tests/nodes/test_group.py b/tests/nodes/test_group.py
index 0ed5ec7..60abef2 100644
--- a/tests/nodes/test_group.py
+++ b/tests/nodes/test_group.py
@@ -1,6 +1,6 @@
-from nodes.block import Block
-from nodes.group import Group
-from nodes.selector import Selector
+from stilus.nodes.block import Block
+from stilus.nodes.group import Group
+from stilus.nodes.selector import Selector
 
 
 def test_group():
diff --git a/tests/nodes/test_ifnode.py b/tests/nodes/test_ifnode.py
index 96a7410..0286958 100644
--- a/tests/nodes/test_ifnode.py
+++ b/tests/nodes/test_ifnode.py
@@ -1,4 +1,4 @@
-from nodes.ifnode import If
+from stilus.nodes.ifnode import If
 
 
 # TODO: implement complete test
diff --git a/tests/nodes/test_indent.py b/tests/nodes/test_indent.py
index 42ba8ff..6957f2b 100644
--- a/tests/nodes/test_indent.py
+++ b/tests/nodes/test_indent.py
@@ -1,5 +1,5 @@
-from nodes.ident import Ident
-from nodes.null import null
+from stilus.nodes.ident import Ident
+from stilus.nodes.null import null
 
 
 def test_ident():
diff --git a/tests/nodes/test_keyframes.py b/tests/nodes/test_keyframes.py
index 2ad4da6..454faf8 100644
--- a/tests/nodes/test_keyframes.py
+++ b/tests/nodes/test_keyframes.py
@@ -1,4 +1,4 @@
-from nodes.keyframes import Keyframes
+from stilus.nodes.keyframes import Keyframes
 
 
 def test_keyframes():
diff --git a/tests/nodes/test_literal.py b/tests/nodes/test_literal.py
index 3d755c6..f884e75 100644
--- a/tests/nodes/test_literal.py
+++ b/tests/nodes/test_literal.py
@@ -1,4 +1,4 @@
-from nodes.literal import Literal
+from stilus.nodes.literal import Literal
 
 
 def test_literal():
diff --git a/tests/nodes/test_media.py b/tests/nodes/test_media.py
index ff87e7d..49b0950 100644
--- a/tests/nodes/test_media.py
+++ b/tests/nodes/test_media.py
@@ -1,4 +1,4 @@
-from nodes.media import Media
+from stilus.nodes.media import Media
 
 
 def test_property():
diff --git a/tests/nodes/test_member.py b/tests/nodes/test_member.py
index a50d7de..87532b7 100644
--- a/tests/nodes/test_member.py
+++ b/tests/nodes/test_member.py
@@ -1,4 +1,4 @@
-from nodes.member import Member
+from stilus.nodes.member import Member
 
 
 def test_member():
diff --git a/tests/nodes/test_node.py b/tests/nodes/test_node.py
index 75558fb..b8110a9 100644
--- a/tests/nodes/test_node.py
+++ b/tests/nodes/test_node.py
@@ -1,6 +1,6 @@
 import pytest
 
-from nodes.node import Node, CoercionError
+from stilus.nodes.node import Node, CoercionError
 
 
 def test_node():
@@ -43,7 +43,7 @@ def test_name():
 
 def test_to_boolean():
     node = Node()
-    from nodes.boolean import true
+    from stilus.nodes.boolean import true
     assert node.to_boolean() == true
 
 
@@ -59,7 +59,7 @@ def test_valid_coerce():
 
 
 def test_invalid_coerce():
-    from nodes.null import null
+    from stilus.nodes.null import null
     node_1 = Node()
     node_2 = null
     with pytest.raises(CoercionError) as excinfo:
diff --git a/tests/nodes/test_null.py b/tests/nodes/test_null.py
index cc4fa16..d392786 100644
--- a/tests/nodes/test_null.py
+++ b/tests/nodes/test_null.py
@@ -1,11 +1,11 @@
-from nodes.null import Null, null
+from stilus.nodes.null import Null, null
 
 
 def test_null():
     assert Null().node_name == 'null'
     assert Null().is_null() is True
     assert hash(Null()) == hash(None)
-    from nodes.boolean import false
+    from stilus.nodes.boolean import false
     assert Null().to_boolean() == false
     assert Null() == null
 
diff --git a/tests/nodes/test_property.py b/tests/nodes/test_property.py
index 067c771..2f0320c 100644
--- a/tests/nodes/test_property.py
+++ b/tests/nodes/test_property.py
@@ -1,6 +1,6 @@
-from nodes.expression import Expression
-from nodes.ident import Ident
-from nodes.property import Property
+from stilus.nodes.expression import Expression
+from stilus.nodes.ident import Ident
+from stilus.nodes.property import Property
 
 
 def test_property():
@@ -12,9 +12,9 @@ def test_property():
 
 
 def test_property_expression():
-    from nodes.boolean import true
-    from nodes.boolean import false
-    from nodes.null import null
+    from stilus.nodes.boolean import true
+    from stilus.nodes.boolean import false
+    from stilus.nodes.null import null
     expression = Expression()
     expression.append(true)
     expression.append(false)
diff --git a/tests/nodes/test_root.py b/tests/nodes/test_root.py
index 26b3499..41ab72a 100644
--- a/tests/nodes/test_root.py
+++ b/tests/nodes/test_root.py
@@ -1,6 +1,6 @@
-from nodes.boolean import true, false
-from nodes.null import null
-from nodes.root import Root
+from stilus.nodes.boolean import true, false
+from stilus.nodes.null import null
+from stilus.nodes.root import Root
 
 
 def test_root():
diff --git a/tests/nodes/test_selector.py b/tests/nodes/test_selector.py
index fa2e12e..7807604 100644
--- a/tests/nodes/test_selector.py
+++ b/tests/nodes/test_selector.py
@@ -1,4 +1,4 @@
-from nodes.selector import Selector
+from stilus.nodes.selector import Selector
 
 
 def test_selector():
diff --git a/tests/nodes/test_string.py b/tests/nodes/test_string.py
index 6345209..df1f5f8 100644
--- a/tests/nodes/test_string.py
+++ b/tests/nodes/test_string.py
@@ -1,9 +1,9 @@
-from nodes.ident import Ident
-from nodes.null import null
-from nodes.string import String
-from nodes.expression import Expression
-from nodes.boolean import false, true
-from nodes.boolean import Boolean
+from stilus.nodes.ident import Ident
+from stilus.nodes.null import null
+from stilus.nodes.string import String
+from stilus.nodes.expression import Expression
+from stilus.nodes.boolean import false, true
+from stilus.nodes.boolean import Boolean
 
 
 def test_string():
diff --git a/tests/nodes/test_ternary.py b/tests/nodes/test_ternary.py
index a3b02d5..7ad8600 100644
--- a/tests/nodes/test_ternary.py
+++ b/tests/nodes/test_ternary.py
@@ -1,5 +1,5 @@
-from nodes.ternary import Ternary
-from nodes.expression import Expression
+from stilus.nodes.ternary import Ternary
+from stilus.nodes.expression import Expression
 
 
 def test_ternary():
diff --git a/tests/nodes/test_unaryop.py b/tests/nodes/test_unaryop.py
index 7e4c7c2..9bad6a6 100644
--- a/tests/nodes/test_unaryop.py
+++ b/tests/nodes/test_unaryop.py
@@ -1,5 +1,5 @@
-from nodes.unaryop import UnaryOp
-from nodes.expression import Expression
+from stilus.nodes.unaryop import UnaryOp
+from stilus.nodes.expression import Expression
 
 
 def test_binop():
diff --git a/tests/nodes/test_unit.py b/tests/nodes/test_unit.py
index 02c3022..2c73d86 100644
--- a/tests/nodes/test_unit.py
+++ b/tests/nodes/test_unit.py
@@ -1,4 +1,4 @@
-from nodes.unit import Unit
+from stilus.nodes.unit import Unit
 
 
 def test_unit():
@@ -10,10 +10,10 @@ def test_unit():
 
 def test_boolean():
     unit = Unit(1, 'Hz')
-    from nodes.boolean import true
+    from stilus.nodes.boolean import true
     assert unit.to_boolean() == true
     unit = Unit(10)
-    from nodes.boolean import Boolean
+    from stilus.nodes.boolean import Boolean
     assert unit.to_boolean() == Boolean(10)
 
 
diff --git a/tests/stack/test_frame.py b/tests/stack/test_frame.py
index 2d5c975..6647051 100644
--- a/tests/stack/test_frame.py
+++ b/tests/stack/test_frame.py
@@ -1,9 +1,9 @@
 from pytest import raises
 
-from nodes.block import Block
-from nodes.ident import Ident
-from stack.frame import Frame
-from stack.scope import Scope
+from stilus.nodes.block import Block
+from stilus.nodes.ident import Ident
+from stilus.stack.frame import Frame
+from stilus.stack.scope import Scope
 
 
 def test_frame_creation():
diff --git a/tests/stack/test_scope.py b/tests/stack/test_scope.py
index ebb716a..b3e2620 100644
--- a/tests/stack/test_scope.py
+++ b/tests/stack/test_scope.py
@@ -1,7 +1,7 @@
-from nodes.null import null
-from nodes.boolean import true
-from nodes.ident import Ident
-from stack.scope import Scope
+from stilus.nodes.null import null
+from stilus.nodes.boolean import true
+from stilus.nodes.ident import Ident
+from stilus.stack.scope import Scope
 
 
 def test_scope():
diff --git a/tests/stack/test_stack.py b/tests/stack/test_stack.py
index 9134ef7..a9cbab6 100644
--- a/tests/stack/test_stack.py
+++ b/tests/stack/test_stack.py
@@ -1,7 +1,7 @@
-from nodes.block import Block
-from nodes.ident import Ident
-from stack.frame import Frame
-from stack.stack import Stack
+from stilus.nodes.block import Block
+from stilus.nodes.ident import Ident
+from stilus.stack.frame import Frame
+from stilus.stack.stack import Stack
 
 
 def test_stack():
diff --git a/tests/stylus/test_cases.py b/tests/stylus/test_cases.py
index 3268294..4cb5ccc 100644
--- a/tests/stylus/test_cases.py
+++ b/tests/stylus/test_cases.py
@@ -3,8 +3,8 @@
 import pytest
 import logging
 
-from functions.resolver import get_resolver
-from renderer import Renderer
+from stilus.functions.resolver import get_resolver
+from stilus.renderer import Renderer
 
 log = logging.getLogger(__name__)
 
diff --git a/tests/test_cli.py b/tests/test_cli.py
index 8a7d8c3..038161c 100644
--- a/tests/test_cli.py
+++ b/tests/test_cli.py
@@ -4,8 +4,8 @@
 import pytest
 from click.testing import CliRunner
 
-import __version__
-import cli
+from stilus import __version__
+from stilus import cli
 
 
 def test_cli_help():
diff --git a/tests/test_lexer.py b/tests/test_lexer.py
index 77c0ceb..796793b 100644
--- a/tests/test_lexer.py
+++ b/tests/test_lexer.py
@@ -1,13 +1,13 @@
 from collections import deque
 
-from lexer import Lexer, Token
-from nodes.boolean import true
-from nodes.color import RGBA
-from nodes.ident import Ident
-from nodes.literal import Literal
-from nodes.null import null
-from nodes.string import String
-from nodes.unit import Unit
+from stilus.lexer import Lexer, Token
+from stilus.nodes.boolean import true
+from stilus.nodes.color import RGBA
+from stilus.nodes.ident import Ident
+from stilus.nodes.literal import Literal
+from stilus.nodes.null import null
+from stilus.nodes.string import String
+from stilus.nodes.unit import Unit
 
 
 def test_lexer_token():
@@ -144,7 +144,7 @@ def test_lexer_indent_outdent():
 def test_lexer_ident_colon_null_newline_eos():
     lexer = Lexer('abc:\n  color: null\n', {})
     tokens = [token for token in lexer]
-    from nodes.null import null
+    from stilus.nodes.null import null
     assert tokens[0] == Token('ident', Ident('abc', null), lineno=1, column=1)
     assert tokens[1] == Token(':', ':', '', lineno=1, column=4)
     assert tokens[2] == Token('ident', Ident('color', null),
@@ -158,7 +158,7 @@ def test_lexer_ident_colon_null_newline_eos():
 def test_lexer_ident_colon_colors():
     lexer = Lexer('abc: #11223311, #aabbcc, #abc1, #fff, #dd, #e', {})
     tokens = [token for token in lexer]
-    from nodes.null import null
+    from stilus.nodes.null import null
     assert tokens[0] == Token('ident', Ident('abc', null), lineno=1, column=1)
     assert tokens[1] == Token(':', ':', ' ', lineno=1, column=4)
     assert tokens[2] == Token('color', RGBA(17, 34, 51, 0.67),
@@ -178,7 +178,7 @@ def test_lexer_ident_colon_colors():
 def test_lexer_ident_space():
     lexer = Lexer('abc def klm:\n  xyz abc\n', {})
     tokens = [token for token in lexer]
-    from nodes.null import null
+    from stilus.nodes.null import null
     assert tokens[0] == Token('ident', Ident('abc', null), lineno=1, column=1)
     assert tokens[1] == Token('space', lineno=1, column=4)
     assert tokens[2] == Token('ident', Ident('def', null), lineno=1, column=5)
@@ -195,7 +195,7 @@ def test_lexer_function_paren_braces_sep_unit():
                   '}\n',
                   {})
     tokens = [token for token in lexer]
-    from nodes.null import null
+    from stilus.nodes.null import null
     assert tokens[0] == Token('function', Ident('bg', null), '',
                               lineno=1, column=1)
     assert tokens[1] == Token(')', ')', '', lineno=1, column=4)
diff --git a/tests/test_parser_core.py b/tests/test_parser_core.py
index 5702258..61a7dcd 100644
--- a/tests/test_parser_core.py
+++ b/tests/test_parser_core.py
@@ -1,8 +1,8 @@
 import pytest
 
-from exceptions import ParseError
-from nodes.ident import Ident
-from parser import Parser
+from stilus.exceptions import ParseError
+from stilus.nodes.ident import Ident
+from stilus.parser import Parser
 
 
 def test_parser_construct():
diff --git a/tests/test_parser_parse.py b/tests/test_parser_parse.py
index f128f3b..ac47114 100644
--- a/tests/test_parser_parse.py
+++ b/tests/test_parser_parse.py
@@ -1,7 +1,7 @@
-from nodes.ident import Ident
-from nodes.literal import Literal
-from nodes.null import null
-from parser import Parser
+from stilus.nodes.ident import Ident
+from stilus.nodes.literal import Literal
+from stilus.nodes.null import null
+from stilus.parser import Parser
 
 
 def test_parser_parse_basic():
diff --git a/tests/test_parser_skip.py b/tests/test_parser_skip.py
index 100cf9e..d2657f0 100644
--- a/tests/test_parser_skip.py
+++ b/tests/test_parser_skip.py
@@ -1,7 +1,7 @@
 from unittest.mock import Mock
 
-from lexer import Token
-from parser import Parser
+from stilus.lexer import Token
+from stilus.parser import Parser
 
 
 def test_parser_skip():
diff --git a/tests/test_parser_stmt.py b/tests/test_parser_stmt.py
index a56af54..1dfee41 100644
--- a/tests/test_parser_stmt.py
+++ b/tests/test_parser_stmt.py
@@ -1,12 +1,12 @@
 from collections import deque
 from unittest.mock import MagicMock
 
-from lexer import Token
-from nodes.group import Group
-from nodes.ident import Ident
-from nodes.literal import Literal
-from nodes.null import null
-from parser import Parser
+from stilus.lexer import Token
+from stilus.nodes.group import Group
+from stilus.nodes.ident import Ident
+from stilus.nodes.literal import Literal
+from stilus.nodes.null import null
+from stilus.parser import Parser
 
 
 def test_parser_selector_parts():
diff --git a/tests/test_stilus.py b/tests/test_stilus.py
index a6ec285..d2f008f 100644
--- a/tests/test_stilus.py
+++ b/tests/test_stilus.py
@@ -1,5 +1,5 @@
-from functions.resolver import get_resolver
-from renderer import Renderer
+from stilus.functions.resolver import get_resolver
+from stilus.renderer import Renderer
 from stilus import renderer
 
 
diff --git a/tests/test_utils.py b/tests/test_utils.py
index 6e19dcb..80c892a 100644
--- a/tests/test_utils.py
+++ b/tests/test_utils.py
@@ -1,7 +1,7 @@
-import utils
-from nodes.boolean import true
-from nodes.expression import Expression
-from nodes.unit import Unit
+from stilus import utils
+from stilus.nodes.boolean import true
+from stilus.nodes.expression import Expression
+from stilus.nodes.unit import Unit
 
 
 def test_unwrap():
diff --git a/tests/test_version.py b/tests/test_version.py
index 01b8393..92de68a 100644
--- a/tests/test_version.py
+++ b/tests/test_version.py
@@ -1,5 +1,5 @@
 from stilus import __version__
-from __version__ import VERSION
+from stilus.__version__ import VERSION
 
 
 def test_version():
diff --git a/tests/visitor/test_compiler.py b/tests/visitor/test_compiler.py
index 98b3c6f..815812d 100644
--- a/tests/visitor/test_compiler.py
+++ b/tests/visitor/test_compiler.py
@@ -1,7 +1,7 @@
-from parser import Parser
-from visitor.compiler import Compiler
-from visitor.evaluator import Evaluator
-from visitor.normalizer import Normalizer
+from stilus.parser import Parser
+from stilus.visitor.compiler import Compiler
+from stilus.visitor.evaluator import Evaluator
+from stilus.visitor.normalizer import Normalizer
 
 
 def test_compiler_create():
diff --git a/tests/visitor/test_evaluator.py b/tests/visitor/test_evaluator.py
index c33a08a..bdde194 100644
--- a/tests/visitor/test_evaluator.py
+++ b/tests/visitor/test_evaluator.py
@@ -1,5 +1,5 @@
-from parser import Parser
-from visitor.evaluator import Evaluator
+from stilus.parser import Parser
+from stilus.visitor.evaluator import Evaluator
 
 
 def test_evaluator_create():
diff --git a/tests/visitor/test_normalizer.py b/tests/visitor/test_normalizer.py
index d6fa18d..ed8b516 100644
--- a/tests/visitor/test_normalizer.py
+++ b/tests/visitor/test_normalizer.py
@@ -1,6 +1,6 @@
-from parser import Parser
-from visitor.evaluator import Evaluator
-from visitor.normalizer import Normalizer
+from stilus.parser import Parser
+from stilus.visitor.evaluator import Evaluator
+from stilus.visitor.normalizer import Normalizer
 
 
 def test_evaluator_create():