TS2377 reported for constructors that unconditionally throw or use return override

[ExE-Boss]

TypeScript Version:

3.7.0-dev.2019-10-10

Search Terms:

• TS2377
• TS 2377
• TS2377 throw
• TS 2377 throw

Code

Code like this is also generated by webidl2js:

class Foo extends Object {
    constructor () {
        throw new TypeError("Illegal constructor");
    }
}

Same with

class Foo extends Object {
    constructor () {
        return Object.create(new.target.prototype);
    }
}

Expected behavior:

No error

Actual behavior:

error TS2377: Constructors for derived classes must contain a 'super' call.

2     constructor() {
      ~~~~~~~~~~~~~~~
3         throw new TypeError();
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
4     }
  ~~~~~

and

error TS2377: Constructors for derived classes must contain a 'super' call.

2     constructor() {
      ~~~~~~~~~~~~~~~
3         return Object.create(new.target.prototype);
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
4     }
  ~~~~~

Playground Link:

🔗

Related Issues:

• 3696

[ExE-Boss]

This also occurs with class constructors that use the return override trick.