const { addSideEffect } = require('@babel/helper-module-imports')
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|
// slightly modifiled from @babel/preset-env/src/utils
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// use an absolute path for core-js modules, to fix conflicts of different core-js versions
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// TODO: remove the `useAbsolutePath` option in v5,
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// because `core-js` is sure to be present in newer projects;
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// we only need absolute path for babel runtime helpers, not for polyfills
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function getModulePath (mod, useAbsolutePath) {
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const modPath =
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mod === 'regenerator-runtime'
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? 'regenerator-runtime/runtime'
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: `core-js/modules/${mod}`
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return useAbsolutePath ? require.resolve(modPath) : modPath
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}
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|
function createImport (path, mod, useAbsolutePath) {
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return addSideEffect(path, getModulePath(mod, useAbsolutePath))
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}
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// add polyfill imports to the first file encountered.
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module.exports = (
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{ types },
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{ polyfills, entryFiles = [], useAbsolutePath }
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) => {
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return {
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name: 'vue-cli-inject-polyfills',
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visitor: {
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Program (path, state) {
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if (!entryFiles.includes(state.filename)) {
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return
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}
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// imports are injected in reverse order
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polyfills
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.slice()
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.reverse()
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.forEach(p => {
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createImport(path, p, useAbsolutePath)
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})
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}
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}
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}
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}
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