allowJs + declaration: Cannot read property 'parent' of undefined

[jgoz]

TypeScript Version: 3.7.x-dev.20191011

Search Terms: "Cannot read property 'parent' of undefined"

Code (JavaScript)

/**
 * @class
 */
function MyClass() {}

/**
 * @returns {new () => MyClass}
 */
export function createSpecialMyClass() {
  var f = function() {
    return new MyClass();
  };

  f.prototype.a = "a";

  return f;
}

tsconfig.json:

{
    "compilerOptions": {
        "allowJs": true,
        "declaration": true,
        "rootDir": "src",
        "outDir": "dist"
    },
    "include": ["src"]
}

Expected behavior:

Compiles and emits .js + .d.ts.

Actual behavior:

Error:

TypeError: Cannot read property 'parent' of undefined
    at getOuterTypeParameters (/Users/johng/dev/typescript-allowjs-bug/node_modules/typescript/lib/tsc.js:32718:29)
    at getOuterTypeParametersOfClassOrInterface (/Users/johng/dev/typescript-allowjs-bug/node_modules/typescript/lib/tsc.js:32769:20)
    at getDeclaredTypeOfClassOrInterface (/Users/johng/dev/typescript-allowjs-bug/node_modules/typescript/lib/tsc.js:33003:43)
    at compareSignaturesRelated (/Users/johng/dev/typescript-allowjs-bug/node_modules/typescript/lib/tsc.js:37883:83)
    at signatureRelatedTo (/Users/johng/dev/typescript-allowjs-bug/node_modules/typescript/lib/tsc.js:39492:24)
    at signaturesRelatedTo (/Users/johng/dev/typescript-allowjs-bug/node_modules/typescript/lib/tsc.js:39455:30)
    at structuredTypeRelatedTo (/Users/johng/dev/typescript-allowjs-bug/node_modules/typescript/lib/tsc.js:39034:43)
    at recursiveTypeRelatedTo (/Users/johng/dev/typescript-allowjs-bug/node_modules/typescript/lib/tsc.js:38783:53)
    at isRelatedTo (/Users/johng/dev/typescript-allowjs-bug/node_modules/typescript/lib/tsc.js:38405:38)
    at checkTypeRelatedTo (/Users/johng/dev/typescript-allowjs-bug/node_modules/typescript/lib/tsc.js:38089:26)

Playground Link:

Unable to figure out how to create a playground link with declaration: true.

Related Issues:

#33735 maybe? This one was blocking me previously.

[sandersn]

Smaller repro:

var f = function() {
    return 12;
};

f.prototype.a = "a";

/** @type {new () => number } */
var x = f;

Still crashes on master.