module.exports = { presets: [ [ "@babel/preset-env", { targets: { node: "10.15.0" }, exclude: ["proposal-async-generator-functions"] // Do not transform async generator functions, since they are supported natively in Node 10 & 12. } ], "@babel/preset-flow" ], plugins: [ "@babel/plugin-proposal-nullish-coalescing-operator", "@babel/plugin-proposal-optional-chaining", "@babel/plugin-proposal-class-properties" ] };