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babelrc.js
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babelrc.js
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const {ifAnyDep, parseEnv} = require('../utils')
const isTest = (process.env.BABEL_ENV || process.env.NODE_ENV) === 'test'
const isPreact = parseEnv('BUILD_PREACT', false)
const isRollup = parseEnv('BUILD_ROLLUP', false)
const isUMD = process.env.BUILD_FORMAT === 'umd'
const isWebpack = parseEnv('BUILD_WEBPACK', false)
const treeshake = parseEnv('BUILD_TREESHAKE', isRollup || isWebpack)
const alias = parseEnv('BUILD_ALIAS', isPreact ? {react: 'preact'} : null)
const envModules = treeshake ? {modules: false} : {}
const envTargets = isTest
? {node: 'current'}
: isWebpack || isRollup ? {browsers: ['ie 10', 'ios 7']} : {node: '4.5'}
const envOptions = Object.assign({}, envModules, {targets: envTargets})
module.exports = {
presets: [
[require.resolve('babel-preset-env'), envOptions],
ifAnyDep(['react', 'preact'], require.resolve('babel-preset-react')),
].filter(Boolean),
plugins: [
require.resolve('babel-macros'),
isRollup ? require.resolve('babel-plugin-external-helpers') : null,
// we're actually not using JSX at all, but I'm leaving this
// in here just in case we ever do (this would be easy to miss).
alias
? [
require.resolve('babel-plugin-module-resolver'),
{root: ['./src'], alias},
]
: null,
isPreact
? [require.resolve('babel-plugin-transform-react-jsx'), {pragma: 'h'}]
: null,
isPreact
? [
require.resolve('babel-plugin-transform-react-remove-prop-types'),
{removeImport: true},
]
: null,
isUMD
? require.resolve('babel-plugin-transform-inline-environment-variables')
: null,
require.resolve('babel-plugin-transform-class-properties'),
require.resolve('babel-plugin-transform-object-rest-spread'),
require.resolve('babel-plugin-minify-dead-code-elimination'),
].filter(Boolean),
}