babel.config.js
// eslint-disable-next-line func-names
module.exports = function (api) {
const validEnv = ['development', 'test', 'production']
const currentEnv = api.env()
const isDevelopmentEnv = api.env('development')
const isProductionEnv = api.env('production')
const isTestEnv = api.env('test')
if (!validEnv.includes(currentEnv)) {
throw new Error(
`${'Please specify a valid `NODE_ENV` or '
+ '`BABEL_ENV` environment variables. Valid values are "development", '
+ '"test", and "production". Instead, received: '}${
JSON.stringify(currentEnv)
}.`,
)
}
return {
presets: [
isTestEnv && [
'@babel/preset-env',
{
targets: {
node: 'current',
},
},
],
(isProductionEnv || isDevelopmentEnv) && [
'@babel/preset-env',
{
forceAllTransforms: true,
useBuiltIns: 'entry',
corejs: 3,
modules: false,
exclude: ['transform-typeof-symbol'],
},
],
].filter(Boolean),
plugins: [
'babel-plugin-macros',
'@babel/plugin-syntax-dynamic-import',
isTestEnv && 'babel-plugin-dynamic-import-node',
'@babel/plugin-transform-destructuring',
[
'@babel/plugin-proposal-class-properties',
{
loose: true,
},
],
[
'@babel/plugin-proposal-object-rest-spread',
{
useBuiltIns: true,
},
],
[
'@babel/plugin-transform-runtime',
{
helpers: false,
},
],
[
'@babel/plugin-transform-regenerator',
{
async: false,
},
],
].filter(Boolean),
}
}