🔎 Search Terms

WeakMap constructors return type JSDoc

🕗 Version & Regression Information

• This is the behavior in every version I tried. I opened Can't extend WeakMap in type-checked JS files #23551 5 years ago, but it got closed in error, as it was never fixed.

⏯ Playground Link

https://www.typescriptlang.org/play?filetype=js#code/MYGwhgzhAEDCD2J4CcCyYAO0CmAPALtgHYAmMA6tmANbpYDeAUNNMPERPsgK7D4oAKAJTQmLFhG4ZsyYQG5m0AL6MlQA

💻 Code

class ColorMap extends WeakMap {
  constructor() {
    super();
  }
}

🙁 Actual behavior

color.js(1,24): error TS2510: Base constructors must all have the same return type.

I tried a few different workarounds, like adding @template generic params, or forcing types using @type JSDoc, but nothing seems to work.

🙂 Expected behavior

No error.

Additional information about the issue

No response