itslanguage-js/babel.config.js at main · itslanguage/itslanguage-js · GitHub

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module.exports = (api) => {
  const env = api.env();
  const test = env === 'test';

  const presets = [
    [
      '@babel/preset-env',
      {
        spec: false,
        loose: true,
        useBuiltIns: 'usage',
        corejs: 3,
        targets: {
          esmodules: true,
        },
        modules: test && 'auto',
      },
    ],
  ];

  const plugins = [
    [
      '@babel/plugin-proposal-class-properties',
      {
        loose: true,
      },
    ],
    [
      '@babel/plugin-proposal-object-rest-spread',
      {
        loose: true,
        useBuiltIns: true,
      },
    ],
    test && ['@babel/plugin-transform-runtime'],
    test && [
      'babel-plugin-istanbul',
      {
        exclude: ['**/*.spec.js'],
      },
    ],
  ];

  return {
    presets,
    plugins: plugins.filter(Boolean),
  };
};