babel/packages/babel-plugin-transform-parameters/test/fixtures/regression/11344-flow/output.js

function a() {
  let b: (c) => void = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};
  let c;
}

function d() {
  let e = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : <T>() => {};
  let T;
}