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module.exports = {  overrides: [    {      test: /\.js$/,      plugins: [        '@babel/plugin-proposal-class-properties',        '@babel/plugin-proposal-nullish-coalescing-operator'      ]    },    {      test: /\.ts$/,      plugins: [        ['@babel/plugin-transform-typescript', { allowDeclareFields: true }],        '@babel/plugin-proposal-class-properties',        '@babel/plugin-proposal-nullish-coalescing-operator'      ]    }  ]}
if (process.env.NODE_ENV === 'test')  module.exports.presets = [['@babel/env', { targets: { node: 'current' } }]]