More invalid JSDoc generate cases

[Jack-Works]

TypeScript Version: 4.0.0-dev.20200516

Search Terms:: JSDoc invalid dts

Code

/**
 * @param {Array=} y desc
 */
function x(y) {}

/**
 * @param {function (Olm.InboundGroupSession)} func Invoked
 */
function y(func) {}

/**
 * @return {(Array.<> | null)} list of devices
 */
function z() {}

/**
 * 
 * @return {?Promise} A promise
 */
function w() {}

Compiler Options

{
 "compilerOptions": {
 "noImplicitAny": true,
 "strictFunctionTypes": true,
 "strictPropertyInitialization": true,
 "strictBindCallApply": true,
 "noImplicitThis": true,
 "noImplicitReturns": true,
 "alwaysStrict": true,
 "esModuleInterop": true,
 "checkJs": true,
 "allowJs": true,
 "declaration": true,
 "experimentalDecorators": true,
 "emitDecoratorMetadata": true,
 "moduleResolution": 2,
 "target": "ES2017",
 "jsx": "React",
 "module": "ESNext"
 }
}

Invalid outputs:

/**
 * @param {Array=} y desc
 */
declare function x(y?: Array | undefined): void;
// ~~~~~~~~~~~~~~~~~~~~~~~~~^ Missing generics

/**
 * @param {function (Olm.InboundGroupSession)} func Invoked
 */
declare function y(func: (arg0: any) => ): void;
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^ invalid type signature

/**
 * @return {(Array.<> | null)} list of devices
 */
declare function z(): (Array | null);
// ~~~~~~~~~~~~~~~~~~~~~~~~~^ missing generics

/**
 *
 * @return {?Promise} A promise
 */
declare function w(): Promise | null;
// ~~~~~~~~~~~~~~~~~~~~~~~~~~^ missing generics

Playground Link: Provided

[Jack-Works]

And seems like fix in #38368 doesn't work on the return value

/**
 * 
 * @return {promise} A promise
 */
function w() {}

/**
 *
 * @return {promise} A promise
 */
declare function w(): any;

[Jack-Works]

related #38356 Wesley Wigham (@weswigham)