text: module.exports = function (api) {
    var validEnv = ['development', 'test', 'production'];
    var currentEnv = api.env();
    var isDevelopmentEnv = api.env('development');
    var isProductionEnv = api.env('production');
    var 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',
            },
            modules: 'commonjs',
          },
          '@babel/preset-react',
        ],
        (isProductionEnv || isDevelopmentEnv) && [
          '@babel/preset-env',
          {
            forceAllTransforms: true,
            useBuiltIns: 'entry',
            corejs: 3,
            modules: false,
            exclude: ['transform-typeof-symbol'],
          },
        ],
        [
          '@babel/preset-react',
          {
            development: isDevelopmentEnv || isTestEnv,
            useBuiltIns: true,
          },
        ],
        ['@babel/preset-typescript', { allExtensions: true, isTSX: true }],
      ].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,
            regenerator: true,
            corejs: false,
          },
        ],
        [
          '@babel/plugin-transform-regenerator',
          {
            async: false,
          },
        ],
        isProductionEnv && [
          'babel-plugin-transform-react-remove-prop-types',
          {
            removeImport: true,
          },
        ],
      ].filter(Boolean),
    };
  };
  