rollup.factory.js

import typescript from 'typescript'

import resolve from '@rollup/plugin-node-resolve'
import json from '@rollup/plugin-json'
import commonjs from '@rollup/plugin-commonjs'
import replace from '@rollup/plugin-replace'
import sourceMaps from 'rollup-plugin-sourcemaps'
import ts from 'rollup-plugin-typescript2'
import polyfills from 'rollup-plugin-node-polyfills'
import progress from 'rollup-plugin-progress'

export default ({
  dir,
  pkg,
  target,
}) => ({
  input: pkg.source,
  cache: true,
  watch: {
    include: 'src/**',
  },
  external: Object.keys(
    Object.assign(
      {},
      pkg.dependencies,
      pkg.peerDependencies,
      pkg.optionalDependencies,
    ),
  ),
  plugins: [
    // Render build progress
    progress(),
    // Allow json resolution
    json(),
    // Allow node_modules resolution, so you can use 'external' to control
    // which external modules to include in the bundle
    // https://github.com/rollup/rollup-plugin-node-resolve#usage
    resolve({
      rootDir: dir,
      preferBuiltins: true,
      browser: target === 'web',
      extensions: ['.mjs', '.ts', '.tsx', '.js', '.jsx', '.json', '.node'],
      mainFields: ['module', 'jsnext', 'main', target === 'web' && 'browser'].filter(Boolean),
      resolveOnly: target === 'node' ? ['tslib'] : [],
    }),
    // Allow bundling cjs modules (unlike webpack, rollup doesn't understand cjs)
    commonjs({
      extensions: ['.mjs', '.js'],
      include: target === 'web' ? /\/node_modules\// : null,
    }),
    // Replace global variables
    replace({
      __VERSION__: JSON.stringify(pkg.version),
      // 'process.env.NODE_ENV': JSON.stringify(process.env.NODE_ENV),
    }),
    // Node polyfills
    target === 'web' && polyfills(),
    // Compile TypeScript files
    ts({
      typescript,
      exclude: ['node_modules/**'],
    }),
    // Resolve source maps to the original source
    sourceMaps(),
  ].filter(Boolean),
})