initial commit

.eslintignore

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+dist

.eslintrc

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+{
+  "extends": [
+    "@nuxtjs/eslint-config-typescript"
+  ]
+}

.github/workflows/ci.yml

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+name: ci
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  ci:
+    runs-on: ${{ matrix.os }}
+
+    strategy:
+      matrix:
+        os: [ubuntu-latest]
+        node: [10]
+
+    steps:
+      - uses: actions/setup-node@v1
+        with:
+          node-version: ${{ matrix.node }}
+
+      - name: checkout
+        uses: actions/checkout@master
+
+      - name: cache node_modules
+        uses: actions/cache@v1
+        with:
+          path: node_modules
+          key: ${{ matrix.os }}-node-v${{ matrix.node }}-deps-${{ hashFiles(format('{0}{1}', github.workspace, '/yarn.lock')) }}
+
+      - name: Install dependencies
+        if: steps.cache.outputs.cache-hit != 'true'
+        run: yarn
+
+      - name: Lint
+        run: yarn lint
+
+      # - name: Test
+      #   run: yarn jest
+
+      # - name: Coverage
+      #   uses: codecov/codecov-action@v1

.gitignore

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+node_modules
+dist
+*.log*

README.md

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+# jiti
+
+Require with just-in-time compiler for typescript and esm files
+
+## Features
+
+- Stable support for typescript and esm syntax
+- Provide sync interface to use inplace of `esm` or `require`
+- Super slim and zero dependency (~1.8M install size)
+- Works with CJS cache
+- [ ] Filesystem caching
+- [ ] Syntax detect to avoid extra transforms
+
+## Usage
+
+```js
+const jiti = require('jiti')(__filename)
+
+jiti('./path/to/file.ts')
+```
+
+## How it works
+
+Transform is based on babel and babel-preset-env
+
+## Development
+
+- Clone Repo
+- Run `yarn`
+- Run `yarn build`
+- Run `yarn dev`
+- Run `node ./test/jiti.js`
+
+## Roadmap
+
+- [x] Basic working
+- [ ] File based caching
+- [ ] Syntax detect and fallback to CJS require
+- [ ] Configurable transform
+- [ ] Try sourcemap improvements
+- [ ] Simplify project build system
+
+## License
+
+MIT

package.json

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+{
+  "name": "jiti",
+  "version": "0.0.0",
+  "description": "",
+  "license": "MIT",
+  "main": "dist/index.js",
+  "types": "dist/index.d.ts",
+  "files": [
+    "dist"
+  ],
+  "scripts": {
+    "build": "yarn build:transform && yarn build:jit",
+    "dev": "yarn build:jit --watch",
+    "build:jit": "rollup -c",
+    "build:transform": "ncc build src/transform.ts -t -m -o dist/transform",
+    "lint": "eslint --ext .ts,.js .",
+    "test": "yarn lint"
+  },
+  "devDependencies": {
+    "@babel/core": "^7.10.2",
+    "@babel/plugin-transform-typescript": "^7.10.1",
+    "@babel/preset-env": "^7.10.2",
+    "@babel/preset-typescript": "^7.10.1",
+    "@nuxtjs/eslint-config-typescript": "^2.0.0",
+    "@rollup/plugin-commonjs": "^13.0.0",
+    "@rollup/plugin-json": "^4.1.0",
+    "@rollup/plugin-node-resolve": "^8.0.1",
+    "@types/babel__core": "^7.1.8",
+    "@types/node": "^14.0.11",
+    "@zeit/ncc": "^0.22.3",
+    "create-require": "^1.0.1",
+    "eslint": "^7.2.0",
+    "resolve": "^1.17.0",
+    "rollup": "^2.13.1",
+    "rollup-plugin-typescript2": "^0.27.1",
+    "tslib": "^2.0.0",
+    "typescript": "^3.9.5"
+  }
+}

rollup.config.js

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+import { builtinModules } from 'module'
+import typescript from 'rollup-plugin-typescript2'
+import commonjs from '@rollup/plugin-commonjs'
+import resolve from '@rollup/plugin-node-resolve'
+import json from '@rollup/plugin-json'
+
+const output = {
+  dir: 'dist',
+  format: 'cjs',
+  preferConst: true
+}
+
+const external = [
+  ...builtinModules
+]
+
+export default {
+  input: './src/index.ts',
+  external,
+  output,
+  plugins: [
+    json(),
+    typescript(),
+    resolve(),
+    commonjs({ extensions: ['.js', '.ts'] })
+  ]
+}

src/index.ts

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+import { readFileSync } from 'fs'
+import { Module, builtinModules } from 'module'
+import { dirname } from 'path'
+import _createRequire from 'create-require'
+import resolve from 'resolve'
+
+export default function jiti (_filename: string): NodeRequire {
+  const { transform } = require('./transform')
+  const _require = _createRequire(_filename)
+
+  // https://www.npmjs.com/package/resolve
+  const resolveOpts = {
+    extensions: ['.js', '.mjs', '.ts'],
+    basedir: dirname(_filename)
+  }
+
+  function requireJIT (id: string) {
+    // Check for builtin node module like fs
+    if (builtinModules.includes(id)) {
+      return _require(id)
+    }
+
+    // Resolve path
+    const filename = resolve.sync(id, resolveOpts)
+
+    // Check for CJS cache
+    if (_require.cache[filename]) {
+      return _require.cache[filename]?.exports
+    }
+
+    // Read source
+    let source = readFileSync(filename, 'utf-8')
+
+    // Apply transform
+    source = transform(source)
+
+    // Compile module
+    const mod = new Module(filename)
+    mod.filename = filename
+    mod.parent = module
+    mod.require = jiti(filename)
+    // @ts-ignore
+    mod.path = dirname(filename)
+    // @ts-ignore
+    mod.paths = Module._nodeModulePaths(mod.path)
+
+    // Compile module
+    // @ts-ignore
+    mod._compile(source, filename)
+
+    // Set as loaded
+    mod.loaded = true
+
+    // Set cache entry
+    _require.cache[filename] = mod
+
+    // Return exports
+    return mod.exports
+  }
+
+  requireJIT.resolve = _require.resolve
+  requireJIT.cache = _require.cache
+  requireJIT.extensions = _require.extensions
+  requireJIT.main = _require.main
+
+  return requireJIT
+}

src/transform.ts

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+import { transformSync } from '@babel/core'
+// @ts-ignore
+import babelPresetEnv from '@babel/preset-env'
+
+export function transform (source: string): string {
+  const result = transformSync(source, {
+    presets: [
+      [babelPresetEnv, {
+        targets: {
+          node: 'current'
+        }
+      }]
+    ]
+  })?.code || ''
+
+  return result
+}

test/.eslintrc

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+{
+  "rules": {
+    "no-console": 0
+  }
+}

test/fixtures/esm/index.js

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+export { default as test } from './test'

test/fixtures/esm/test.js

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+export default function test () {
+  return {
+    file: __filename,
+    dir: __dirname
+  }
+}

test/fixtures/typescript/index.ts

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+export { default as test } from './test'

test/fixtures/typescript/test.ts

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+export default function test () {
+  return {
+    file: __filename,
+    dir: __dirname
+  }
+}

test/jiti.js

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+const jiti = require('..')(__filename)
+
+console.log(jiti('./fixtures/esm').test())
+console.log(jiti('./fixtures/typescript').test())

tsconfig.json

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+{
+  "compilerOptions": {
+    "target": "ES6",
+    "module": "ESNext",
+    "moduleResolution": "Node",
+    "allowSyntheticDefaultImports": true,
+    "strict": true,
+    "declarationDir": "dist",
+    "declaration": true,
+    "types": [
+      "node"
+    ]
+  },
+  "include": [
+    "src"
+  ]
+}