babel.config.js

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require('./config/dotenv')

const development = process.env.NODE_ENV === 'development'
const production = process.env.NODE_ENV === 'production'
const analyze = process.env.ANALYZE === '1'
const debuggableProd = process.env.DEBUGGABLE_PROD === '1'

module.exports = (api) => {
  const test = api.caller((caller) => !!(caller && caller.name === 'babel-jest'))
  const node = api.caller((caller) => !!(caller && caller.name === '@babel/node'))
  const web = !(test || node)

  return {
    compact: false,
    presets: [
      [
        'next/babel',
        {
          'preset-env': {
            useBuiltIns: 'usage',
            corejs: '3',
            modules: web ? false : undefined,
          },
          // 'transform-runtime': {},
          // 'styled-jsx': {},
          'class-properties': { loose: true },
        },
      ],
    ],
    plugins: [
      ['@babel/plugin-proposal-decorators', { legacy: true }],
      'babel-plugin-parameter-decorator',
      '@babel/plugin-proposal-numeric-separator',
      ['babel-plugin-styled-components', { ssr: true }],
      'babel-plugin-lodash',
      (development || debuggableProd) && web && !analyze && ['babel-plugin-typescript-to-proptypes', { typeCheck: './src/**/*.ts' }], // prettier-ignore
      (development || debuggableProd) && web && !analyze && 'babel-plugin-redux-saga', // prettier-ignore
      (development || analyze || debuggableProd) && web && 'babel-plugin-smart-webpack-import', // prettier-ignore
      production && web && ['babel-plugin-transform-react-remove-prop-types', { removeImport: true }], // prettier-ignore
      production && web && '@babel/plugin-transform-flow-strip-types',
      !(development || debuggableProd) && web && '@babel/plugin-transform-react-inline-elements', // prettier-ignore
      !(development || debuggableProd) && web && '@babel/plugin-transform-react-constant-elements', // prettier-ignore
      ['babel-plugin-strip-function-call', { strip: ['timerStart', 'timerEnd'] }],
    ].filter(Boolean),
  }
}