initial commit

.gitignore

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+coverage
+node_modules

babel.config.json

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+{
+  "presets": ["@babel/preset-env"]
+}

jest.config.mjs

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+/*
+ * For a detailed explanation regarding each configuration property, visit:
+ * https://jestjs.io/docs/configuration
+ */
+
+export default {
+  // All imported modules in your tests should be mocked automatically
+  // automock: false,
+
+  // Stop running tests after `n` failures
+  // bail: 0,
+
+  // The directory where Jest should store its cached dependency information
+  // cacheDirectory: "/private/var/folders/l1/bv6vzh4j429f_q5l2d3jftrw0000gn/T/jest_dx",
+
+  // Automatically clear mock calls, instances and results before every test
+  clearMocks: true,
+
+  // Indicates whether the coverage information should be collected while executing the test
+  collectCoverage: true,
+
+  // An array of glob patterns indicating a set of files for which coverage information should be collected
+  // collectCoverageFrom: undefined,
+
+  // The directory where Jest should output its coverage files
+  coverageDirectory: "coverage",
+
+  // An array of regexp pattern strings used to skip coverage collection
+  // coveragePathIgnorePatterns: [
+  //   "/node_modules/"
+  // ],
+
+  // Indicates which provider should be used to instrument code for coverage
+  // coverageProvider: "babel",
+
+  // A list of reporter names that Jest uses when writing coverage reports
+  // coverageReporters: [
+  //   "json",
+  //   "text",
+  //   "lcov",
+  //   "clover"
+  // ],
+
+  // An object that configures minimum threshold enforcement for coverage results
+  // coverageThreshold: undefined,
+
+  // A path to a custom dependency extractor
+  // dependencyExtractor: undefined,
+
+  // Make calling deprecated APIs throw helpful error messages
+  // errorOnDeprecated: false,
+
+  // Force coverage collection from ignored files using an array of glob patterns
+  // forceCoverageMatch: [],
+
+  // A path to a module which exports an async function that is triggered once before all test suites
+  // globalSetup: undefined,
+
+  // A path to a module which exports an async function that is triggered once after all test suites
+  // globalTeardown: undefined,
+
+  // A set of global variables that need to be available in all test environments
+  // globals: {},
+
+  // The maximum amount of workers used to run your tests. Can be specified as % or a number. E.g. maxWorkers: 10% will use 10% of your CPU amount + 1 as the maximum worker number. maxWorkers: 2 will use a maximum of 2 workers.
+  // maxWorkers: "50%",
+
+  // An array of directory names to be searched recursively up from the requiring module's location
+  // moduleDirectories: [
+  //   "node_modules"
+  // ],
+
+  // An array of file extensions your modules use
+  // moduleFileExtensions: [
+  //   "js",
+  //   "jsx",
+  //   "ts",
+  //   "tsx",
+  //   "json",
+  //   "node"
+  // ],
+
+  // A map from regular expressions to module names or to arrays of module names that allow to stub out resources with a single module
+  // moduleNameMapper: {},
+
+  // An array of regexp pattern strings, matched against all module paths before considered 'visible' to the module loader
+  // modulePathIgnorePatterns: [],
+
+  // Activates notifications for test results
+  // notify: false,
+
+  // An enum that specifies notification mode. Requires { notify: true }
+  // notifyMode: "failure-change",
+
+  // A preset that is used as a base for Jest's configuration
+  // preset: undefined,
+
+  // Run tests from one or more projects
+  // projects: undefined,
+
+  // Use this configuration option to add custom reporters to Jest
+  // reporters: undefined,
+
+  // Automatically reset mock state before every test
+  // resetMocks: false,
+
+  // Reset the module registry before running each individual test
+  // resetModules: false,
+
+  // A path to a custom resolver
+  // resolver: undefined,
+
+  // Automatically restore mock state and implementation before every test
+  // restoreMocks: false,
+
+  // The root directory that Jest should scan for tests and modules within
+  // rootDir: undefined,
+
+  // A list of paths to directories that Jest should use to search for files in
+  // roots: [
+  //   "<rootDir>"
+  // ],
+
+  // Allows you to use a custom runner instead of Jest's default test runner
+  // runner: "jest-runner",
+
+  // The paths to modules that run some code to configure or set up the testing environment before each test
+  // setupFiles: [],
+
+  // A list of paths to modules that run some code to configure or set up the testing framework before each test
+  // setupFilesAfterEnv: [],
+
+  // The number of seconds after which a test is considered as slow and reported as such in the results.
+  // slowTestThreshold: 5,
+
+  // A list of paths to snapshot serializer modules Jest should use for snapshot testing
+  // snapshotSerializers: [],
+
+  // The test environment that will be used for testing
+  // testEnvironment: "jest-environment-node",
+
+  // Options that will be passed to the testEnvironment
+  // testEnvironmentOptions: {},
+
+  // Adds a location field to test results
+  // testLocationInResults: false,
+
+  // The glob patterns Jest uses to detect test files
+  // testMatch: [
+  //   "**/__tests__/**/*.[jt]s?(x)",
+  //   "**/?(*.)+(spec|test).[tj]s?(x)"
+  // ],
+
+  // An array of regexp pattern strings that are matched against all test paths, matched tests are skipped
+  // testPathIgnorePatterns: [
+  //   "/node_modules/"
+  // ],
+
+  // The regexp pattern or array of patterns that Jest uses to detect test files
+  // testRegex: [],
+
+  // This option allows the use of a custom results processor
+  // testResultsProcessor: undefined,
+
+  // This option allows use of a custom test runner
+  // testRunner: "jest-circus/runner",
+
+  // This option sets the URL for the jsdom environment. It is reflected in properties such as location.href
+  // testURL: "http://localhost",
+
+  // Setting this value to "fake" allows the use of fake timers for functions such as "setTimeout"
+  // timers: "real",
+
+  // A map from regular expressions to paths to transformers
+  // transform: undefined,
+  "transform": {
+    "^.+\\.[t|j]sx?$": "babel-jest"
+  }
+
+  // An array of regexp pattern strings that are matched against all source file paths, matched files will skip transformation
+  // transformIgnorePatterns: [
+  //   "/node_modules/",
+  //   "\\.pnp\\.[^\\/]+$"
+  // ],
+
+  // An array of regexp pattern strings that are matched against all modules before the module loader will automatically return a mock for them
+  // unmockedModulePathPatterns: undefined,
+
+  // Indicates whether each individual test should be reported during the run
+  // verbose: undefined,
+
+  // An array of regexp patterns that are matched against all source file paths before re-running tests in watch mode
+  // watchPathIgnorePatterns: [],
+
+  // Whether to use watchman for file crawling
+  // watchman: true,
+};

metho.test.js

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+import * as Metho from './metho.js'
+
+describe("metho library", () => {
+  it("should augment multiple prototypes", () => {
+    const nonHash = Symbol("No hash")
+    const constHash = Metho.add(
+      [Number.prototype, String.prototype],
+      () => nonHash,
+    )
+
+    expect(12345[constHash]).toBe(nonHash)
+    expect("this is a string"[constHash]).toBe(nonHash)
+  })
+
+  describe("add", () => {
+    it("should augment a single prototype (named)", () => {
+      const asHex = Metho.add(
+        Number.prototype,
+        function toHex () { return this.toString(16) }
+      )
+
+      expect(65534[asHex]).toBe("fffe")
+    })
+
+    it("should augment a single prototype (unnamed)", () => {
+      const asHex = Metho.add(
+        Number.prototype,
+        function () { return this.toString(16) }
+      )
+
+      expect(65534[asHex]).toBe("fffe")
+    })
+
+    it("should augment a single prototype (outer)", () => {
+      const chunk = Metho.add(
+        String.prototype,
+        function(length) {
+          return this.match(new RegExp('.{1,' + length + '}', 'g'))
+        }
+      )
+
+      expect("Hello World!"[chunk(2)])
+        .toEqual(["He", "ll", "o ", "Wo", "rl", "d!"])
+    })
+
+    it("should augment a single prototype (outer)", () => {
+      const chunk = Metho.add(
+        String.prototype,
+        function(length) {
+          return this.match(new RegExp('.{1,' + length + '}', 'g'))
+        },
+        {outerSyntax: true}
+      )
+
+      expect("Hello World!"[chunk](2))
+        .toEqual(["He", "ll", "o ", "Wo", "rl", "d!"])
+    })
+  })
+
+  describe("addSimple", () => {
+    it("should augment a single prototype (named)", () => {
+      const asHex = Metho.addSimple(
+        Number.prototype,
+        function toHex () { return this.toString(16) }
+      )
+
+      expect(65534[asHex]).toBe("fffe")
+    })
+
+    it("should augment a single prototype (unnamed)", () => {
+      const asHex = Metho.addSimple(
+        Number.prototype,
+        function () { return this.toString(16) }
+      )
+
+      expect(65534[asHex]).toBe("fffe")
+    })
+  })
+
+  describe("addProperty", () => {
+    it("should augment a single prototype (named)", () => {
+      const chunk = Metho.addProperty(
+        String.prototype,
+        function chunks(length) {
+          return this.match(new RegExp('.{1,' + length + '}', 'g'))
+        }
+      )
+
+      expect("Hello World!"[chunk](2))
+        .toEqual(["He", "ll", "o ", "Wo", "rl", "d!"])
+    })
+
+    it("should augment a single prototype (unnamed)", () => {
+      const chunk = Metho.addProperty(
+        String.prototype,
+        function(length) {
+          return this.match(new RegExp('.{1,' + length + '}', 'g'))
+        },
+        {outerSyntax: true}
+      )
+
+      expect("Hello World!"[chunk](2))
+        .toEqual(["He", "ll", "o ", "Wo", "rl", "d!"])
+    })
+  })
+
+  describe("addWithParams", () => {
+    it("should augment a single prototype (named)", () => {
+      const chunk = Metho.addWithParams(
+        String.prototype,
+        function chunks(length) {
+          return this.match(new RegExp('.{1,' + length + '}', 'g'))
+        }
+      )
+
+      expect("Hello World!"[chunk(2)])
+        .toEqual(["He", "ll", "o ", "Wo", "rl", "d!"])
+    })
+
+    it("should augment a single prototype (unnamed)", () => {
+      const chunk = Metho.addWithParams(
+        String.prototype,
+        function(length) {
+          return this.match(new RegExp('.{1,' + length + '}', 'g'))
+        }
+      )
+
+      expect("Hello World!"[chunk(2)])
+        .toEqual(["He", "ll", "o ", "Wo", "rl", "d!"])
+    })
+  })
+})