/
index.js
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index.js
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const coreJsMeta = {
2: {
prefixes: {
es6: 'es6',
es7: 'es7'
},
builtIns: require.resolve('@babel/compat-data/corejs2-built-ins')
},
3: {
prefixes: {
es6: 'es',
es7: 'es'
},
builtIns: require.resolve('core-js-compat/data')
}
}
function getMajorVersion (version) {
if (typeof version === 'number') {
return Math.floor(version)
} else {
return Number(version.split('.')[0])
}
}
function getDefaultPolyfills (corejs) {
const { prefixes: { es6, es7 } } = coreJsMeta[getMajorVersion(corejs.version)]
return [
// Promise polyfill alone doesn't work in IE,
// Needs this as well. see: #1642
`${es6}.array.iterator`,
// This is required for webpack code splitting, vuex etc.
`${es6}.promise`,
// this is needed for object rest spread support in templates
// as vue-template-es2015-compiler 1.8+ compiles it to Object.assign() calls.
`${es6}.object.assign`,
// #2012 es7.promise replaces native Promise in FF and causes missing finally
`${es7}.promise.finally`
]
}
function getPolyfills (targets, includes, { ignoreBrowserslistConfig, configPath, corejs }) {
const { default: getTargets, isRequired } = require('@babel/helper-compilation-targets')
const builtInsList = require(coreJsMeta[getMajorVersion(corejs.version)].builtIns)
const builtInTargets = getTargets(targets, {
ignoreBrowserslistConfig,
configPath
})
return includes.filter(item => isRequired(
'nuxt-polyfills',
builtInTargets,
{
compatData: { 'nuxt-polyfills': builtInsList[item] }
}
))
}
module.exports = (api, options = {}) => {
const presets = []
const plugins = []
const envName = api.env()
const {
bugfixes,
polyfills: userPolyfills,
loose = false,
debug = false,
useBuiltIns = 'usage',
modules = false,
spec,
ignoreBrowserslistConfig = envName === 'modern',
configPath,
include,
exclude,
shippedProposals,
forceAllTransforms,
decoratorsBeforeExport,
decoratorsLegacy,
absoluteRuntime
} = options
let { corejs = { version: 2 } } = options
if (typeof corejs !== 'object') {
corejs = { version: Number(corejs) }
}
if (corejs.proposals === undefined) {
corejs.proposals = true
}
const defaultTargets = {
server: { node: 'current' },
client: { ie: 9 },
modern: { esmodules: true }
}
const { targets = defaultTargets[envName] } = options
const polyfills = []
if (envName === 'client' && useBuiltIns === 'usage') {
polyfills.push(
...getPolyfills(
targets,
userPolyfills || getDefaultPolyfills(corejs),
{
ignoreBrowserslistConfig,
configPath,
corejs
}
)
)
plugins.push([require('./polyfills-plugin'), { polyfills }])
}
// Pass options along to babel-preset-env
presets.push([
require('@babel/preset-env'), {
bugfixes,
spec,
loose,
debug,
modules,
targets,
useBuiltIns,
corejs,
ignoreBrowserslistConfig,
configPath,
include,
exclude: [
...exclude || [],
...polyfills,
// Although preset-env includes class-properties
// but webpack 4 doesn't support the syntax when target supports and babel transpilation is skipped
// https://github.com/webpack/webpack/issues/9708
'@babel/plugin-proposal-class-properties',
'@babel/plugin-proposal-private-methods'
],
shippedProposals,
forceAllTransforms
}
])
// JSX
if (options.jsx !== false) {
presets.push([require('@vue/babel-preset-jsx'), Object.assign({}, options.jsx)])
}
plugins.push(
[require('@babel/plugin-proposal-decorators'), {
decoratorsBeforeExport,
legacy: decoratorsLegacy !== false
}],
// class-properties and private-methods need same loose value
[require('@babel/plugin-proposal-class-properties'), { loose: true }],
[require('@babel/plugin-proposal-private-methods'), { loose: true }]
)
// Transform runtime, but only for helpers
plugins.push([require('@babel/plugin-transform-runtime'), {
regenerator: useBuiltIns !== 'usage',
corejs: false,
helpers: useBuiltIns === 'usage',
useESModules: envName !== 'server',
absoluteRuntime
}])
// https://github.com/nuxt/nuxt.js/issues/7722
if (envName === 'server') {
plugins.push(require('@babel/plugin-proposal-optional-chaining'))
plugins.push(require('@babel/plugin-proposal-nullish-coalescing-operator'))
}
return {
sourceType: 'unambiguous',
presets,
plugins
}
}