ts-init/index.js

Minimalist TypeScript package initializer - like `npm init`, but for TS

#! /usr/bin/env node

const {exec} = require('child_process')
const fs = require('fs')

const tsConfig = {
  compilerOptions: {
    lib: ['es6'],
    alwaysStrict: true,
    strictNullChecks: true,
    noImplicitAny: true,
  },
  files: ['src/index.ts'],
}

const noop = _ => {}

function main() {
  if (!fs.existsSync('package.json')) {
    console.error('No package.json found - create a new one with: npm init.')

    process.exit()
  }

  console.log('1. Installing typescript, ts-node, rimraf...')
  exec('npm i -D typescript ts-node rimraf', (err, stdout, stderr) => {
    if (stderr) {
      console.error(stderr)
    }

    if (err) {
      console.error(err)

      process.exit()
    }

    console.log('✓ 1/3 Done!')

    modifyPackage()
    createFiles()

    info()
  })
}

function modifyPackage() {
  console.log('2. Adding stuff to package.json...')

  const pkg = fs.readFileSync('package.json')
  const json = JSON.parse(pkg)

  if (!json.scripts) {
    json.scripts = {}
  }

  Object.assign(json.scripts, {
    'build:commonjs':
      'rimraf lib && tsc --target es5 --outDir lib --module commonjs --declaration',
    'build:es': 'rimraf es && tsc --target es6 --outDir es --module es6',
    build: 'npm run build:commonjs && npm run build:es',
    ts: 'ts-node src/',
    prepublishOnly: 'npm run build',
  })

  json.files = ['es', 'lib']

  json.main = './lib/index.js'
  json.types = './lib/index.d.ts'
  json.module = json['jsnext:main'] = './es/index.js'

  fs.writeFileSync('package.json', JSON.stringify(json, null, 2))

  console.log('✓ 2/3 Done!')
}

function createFiles() {
  console.log('3. Creating files and directories...')

  if (!fs.existsSync('src')) fs.mkdirSync('src')
  if (!fs.existsSync('test')) fs.mkdirSync('test')

  fs.writeFileSync('tsconfig.json', JSON.stringify(tsConfig, null, 2))
  fs.appendFileSync('.gitignore', 'lib\nes\n')

  console.log('✓ 3/3 Done!')
}

function info() {
  console.log('---')
  console.log('Files:')
  console.log('src/            - source files')
  console.log('test/           - test files')
  console.log('es/             - ES6 build files')
  console.log('lib/            - CommonJS (npm) build files')
  console.log('tsconfig.json   - TypeScript config')
  console.log()
  console.log('Scripts:')
  console.log('npm run build   - build project')
  console.log('npm run ts      - run project with ts-node')
  console.log('---')
  console.log('Enjoy your coding! :)')
}

main()