import * as pkg from '../package.json'
import babel from '@rollup/plugin-babel'
import multiEntry from '@rollup/plugin-multi-entry'
import resolve from '@rollup/plugin-node-resolve'
import commonjs from '@rollup/plugin-commonjs'

const getBabelConfig = (targets) => babel({
  include: ['src/**', 'spec/**/*'],
  babelHelpers: 'runtime',
  babelrc: false,
  presets: [['@babel/preset-env', {
    modules: false,
    targets: targets || pkg.browserslist,
    // useBuildins and plugin-transform-runtime are mutually exclusive
    // https://github.com/babel/babel/issues/10271#issuecomment-528379505
    // use babel-polyfills when released
    useBuiltIns: false,
    // corejs: 3,
    bugfixes: true
  }]],
  plugins: [
    ['@babel/plugin-transform-runtime', {
      corejs: 3,
      helpers: true,
      useESModules: true,
      version: "^7.9.6",
      regenerator: false
    }]
  ]
})

export default {
  input: [
    'spec/setupBrowser.js',
    'spec/spec/*/*.js'
  ],
  output: {
    file: 'spec/es5TestBundle.js',
    name: 'SVGTests',
    format: 'iife',
  },
  plugins: [
    resolve({ browser: true }),
    commonjs(),
    getBabelConfig(),
    multiEntry()
  ],
  external: ['@babel/runtime', '@babel/runtime-corejs3']
}