quasar

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// Inspired by @vue/babel-preset-app
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const path = require('path')
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const {
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  default: getTargets,
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  isRequired
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} = require('@babel/helper-compilation-targets')
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function getPolyfills (targets, userPolyfills = []) {
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  // if no targets specified, include all default polyfills
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  if (!userPolyfills.length || !targets || !Object.keys(targets).length) {
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    return userPolyfills
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  }
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  const compatData = require('core-js-compat').data
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  return userPolyfills.filter(item => isRequired(item, targets, { compatData }))
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}
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module.exports = (_, opts = {}) => {
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  const presets = []
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  const plugins = []
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  const runtimePath = path.dirname(require.resolve('@babel/runtime/package.json'))
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  const runtimeVersion = require('@babel/runtime/package.json').version
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  const {
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    polyfills: userPolyfills,
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    loose = false,
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    debug = false,
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    useBuiltIns = 'usage',
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    modules = false,
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    bugfixes = true,
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    targets: rawTargets,
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    spec,
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    include,
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    exclude,
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    shippedProposals,
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    forceAllTransforms,
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    decoratorsBeforeExport,
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    decoratorsLegacy,
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    // Undocumented option of @babel/plugin-transform-runtime.
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    // When enabled, an absolute path is used when importing a runtime helper after transforming.
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    // This ensures the transpiled file always use the runtime version required in this package.
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    // However, this may cause hash inconsistency if the project is moved to another directory.
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    // So here we allow user to explicit disable this option if hash consistency is a requirement
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    // and the runtime version is sure to be correct.
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    absoluteRuntime = runtimePath,
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    // https://babeljs.io/docs/en/babel-plugin-transform-runtime#version
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    // By default transform-runtime assumes that @babel/runtime@7.0.0-beta.0 is installed, which means helpers introduced later than 7.0.0-beta.0 will be inlined instead of imported.
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    // See https://github.com/babel/babel/issues/10261
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    // And https://github.com/facebook/docusaurus/pull/2111
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    version = runtimeVersion
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  } = opts
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  let targets = getTargets(rawTargets)
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  let polyfills = []
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  if (useBuiltIns === 'usage') {
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    polyfills = getPolyfills(targets, userPolyfills)
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    if (polyfills.length > 0) {
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      plugins.push([
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        require('./polyfills'),
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        { polyfills, useAbsolutePath: !!absoluteRuntime }
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      ])
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    }
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  }
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  const envOptions = {
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    bugfixes,
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    corejs: useBuiltIns ? require('core-js/package.json').version : false,
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    spec,
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    loose,
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    debug,
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    modules,
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    targets,
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    useBuiltIns,
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    include,
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    exclude: polyfills.concat(exclude || []),
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    shippedProposals,
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    forceAllTransforms
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  }
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  // pass options along to babel-preset-env
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  presets.unshift([ require('@babel/preset-env'), envOptions ])
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  plugins.push(
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    // Stage 2
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    [
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      require('@babel/plugin-proposal-decorators'), {
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        decoratorsBeforeExport,
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        legacy: decoratorsLegacy !== false
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      }
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    ],
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    [
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      require('@babel/plugin-transform-class-properties'), {
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        loose
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      }
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    ],
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    require('@babel/plugin-proposal-function-sent'),
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    require('@babel/plugin-transform-export-namespace-from'),
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    require('@babel/plugin-transform-numeric-separator'),
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    require('@babel/plugin-proposal-throw-expressions'),
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    // Stage 3
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    require('@babel/plugin-syntax-dynamic-import'),
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    require('@babel/plugin-syntax-import-meta'),
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    require('@babel/plugin-transform-json-strings'),
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    // Transform runtime, but only for helpers
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    [
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      require('@babel/plugin-transform-runtime'), {
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        regenerator: useBuiltIns !== 'usage',
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        // polyfills are injected by preset-env & polyfillsPlugin, so no need to add them again
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        corejs: false,
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        helpers: useBuiltIns === 'usage',
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        useESModules: false,
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        absoluteRuntime,
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        version
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      }
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    ]
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  )
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  return {
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    sourceType: 'unambiguous',
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    overrides: [{
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      exclude: [ /@babel[\/|\\\\]runtime/, /core-js/ ],
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      presets,
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      plugins
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    }, {
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      // there are some untranspiled code in @babel/runtime
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      // https://github.com/babel/babel/issues/9903
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      include: [ /@babel[\/|\\\\]runtime/ ],
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      presets: [
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        [ require('@babel/preset-env'), envOptions ]
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      ]
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    }]
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  }
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}
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