From 94fdd6ff08d632b91bce18965ca4b38dc612ae43 Mon Sep 17 00:00:00 2001
From: James Yeoman <james.yeoman@planglow.com>
Date: Wed, 6 Mar 2024 12:30:57 +0000
Subject: [PATCH] Provide a CJS build

---
 package.json                               | 14 +++++++++++---
 test/esbuild.js                            |  2 +-
 tsconfig.cjs.json                          | 15 +++++++++++++++
 tsconfig.esm.json                          |  8 ++++++++
 tsconfig.build.json => tsconfig.types.json |  7 +++----
 5 files changed, 38 insertions(+), 8 deletions(-)
 create mode 100644 tsconfig.cjs.json
 create mode 100644 tsconfig.esm.json
 rename tsconfig.build.json => tsconfig.types.json (56%)

diff --git a/package.json b/package.json
index 511e4fc..3176835 100644
--- a/package.json
+++ b/package.json
@@ -18,14 +18,22 @@
   "license": "MIT",
   "author": "Robin Löffel (https://robinloeffel.ch) <hi@robinloeffel.ch>",
   "type": "module",
-  "main": "dist/index.js",
-  "types": "dist/index.d.ts",
+  "main": "dist/esm/index.js",
+  "types": "dist/types/index.d.ts",
+  "exports": {
+    "types": "./dist/types/index.d.ts",
+    "require": "./dist/cjs/index.js",
+    "default": "./dist/esm/index.js"
+  },
   "files": [
     "src",
     "dist"
   ],
   "scripts": {
-    "build": "rm -rf dist && tsc --project tsconfig.build.json",
+    "build": "rm -rf dist && concurrently npm:build:*",
+    "build:cjs": "tsc --project tsconfig.cjs.json",
+    "build:esm": "tsc --project tsconfig.esm.json",
+    "build:types": "tsc --project tsconfig.types.json",
     "prepack": "npm run build",
     "start": "npm run watch",
     "watch": "concurrently npm:watch:*",
diff --git a/test/esbuild.js b/test/esbuild.js
index 2a59be2..d5b717f 100644
--- a/test/esbuild.js
+++ b/test/esbuild.js
@@ -1,5 +1,5 @@
 import { build } from "esbuild";
-import eslint from "../dist/index.js";
+import eslint from "../dist/esm/index.js";
 
 const absolute = relative => new URL(relative, import.meta.url).pathname;
 
diff --git a/tsconfig.cjs.json b/tsconfig.cjs.json
new file mode 100644
index 0000000..a8410b5
--- /dev/null
+++ b/tsconfig.cjs.json
@@ -0,0 +1,15 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "noEmit": false,
+    "outDir": "./dist/cjs",
+
+    // Enable CJS output
+    "module": "CommonJS",
+    "moduleResolution": "Node",
+
+    // verbatimModuleSyntax doesn't transform import to require
+    "verbatimModuleSyntax": false
+  },
+  "include": ["./src"]
+}
diff --git a/tsconfig.esm.json b/tsconfig.esm.json
new file mode 100644
index 0000000..622d986
--- /dev/null
+++ b/tsconfig.esm.json
@@ -0,0 +1,8 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "noEmit": false,
+    "outDir": "./dist/esm"
+  },
+  "include": ["./src"]
+}
diff --git a/tsconfig.build.json b/tsconfig.types.json
similarity index 56%
rename from tsconfig.build.json
rename to tsconfig.types.json
index bf59e32..7b25786 100644
--- a/tsconfig.build.json
+++ b/tsconfig.types.json
@@ -3,9 +3,8 @@
   "compilerOptions": {
     "noEmit": false,
     "declaration": true,
-    "outDir": "./dist"
+    "emitDeclarationOnly": true,
+    "outDir": "./dist/types"
   },
-  "include": [
-    "./src"
-  ]
+  "include": ["./src"]
 }