swc/crates/swc_ecma_parser/tests/tsc/optionalChainingInParameterInitializer.2.ts

// @target: esnext,es2015,es5
// @noTypesAndSymbols: true
// @noEmit: true

// https://github.com/microsoft/TypeScript/issues/36295
const a = (): { d: string } | undefined => undefined;
((b = a()?.d) => { var a; })();

const x = "";
((b = a()?.d, d = x) => { var x; })();