Calling super from an overloaded constructor

[westy92]

TypeScript Version: 2.8.0-dev.20180211
(Tested in the above version, but found in 2.7.1)

Search Terms:
overload constructor super
super expected arguments got 0 or more.

Code:

class MyDate extends Date {

  public constructor();
  public constructor(vd: VarDate);
  public constructor(value: Date);
  public constructor(value: number);
  public constructor(value: string);
  public constructor(year: number, month: number, date?: number, hours?: number, minutes?: number, seconds?: number, ms?: number);
  public constructor(...args: any[]) {
    super(...args);
    // sublcass-specific code
  }

}

Expected behavior:
Code compiles without error.

Actual behavior:
Error: Expected 0-7 arguments, but got 0 or more.

Playground Link:
FYI it seems a bit extreme that it just puts the source in the URL, but here it is:
https://www.typescriptlang.org/play/#src=class%20MyDate%20extends%20Date%20%7B%0D%0A%0D%0A%20%20public%20constructor()%3B%0D%0A%20%20public%20constructor(vd%3A%20VarDate)%3B%0D%0A%20%20public%20constructor(value%3A%20Date)%3B%0D%0A%20%20public%20constructor(value%3A%20number)%3B%0D%0A%20%20public%20constructor(value%3A%20string)%3B%0D%0A%20%20public%20constructor(year%3A%20number%2C%20month%3A%20number%2C%20date%3F%3A%20number%2C%20hours%3F%3A%20number%2C%20minutes%3F%3A%20number%2C%20seconds%3F%3A%20number%2C%20ms%3F%3A%20number)%3B%0D%0A%20%20public%20constructor(...args%3A%20any%5B%5D)%20%7B%0D%0A%20%20%20%20super(...args)%3B%0D%0A%20%20%20%20%2F%2F%20sublcass-specific%20code%0D%0A%20%20%7D%0D%0A%0D%0A%7D

Related Issues:
#1790
#11679

[RyanCavanaugh]

@sandersn any ideas on what to do here? My initial reaction was (super as any)(...args) but that doesn't compile for multiple reasons. I was also surprised super(...(args as []); didn't work

[westy92]

I tried this:

// super(...args);
super();
Date.apply(this, args);

It compiles, but some unit tests are now failing. I'm not sure if the failures are related or not.

[westy92]

I also tried:

super(...(args.slice(0, 7)));

No luck, but I didn't like that solution anyways.

[mhegazy]

assuming #4130 is fixed, you can cast to a tuple.

Until then, //@ts-ignore is your best bet here.

[sandersn]

@westy92 I have most of #4130 fixed at the branch spread-tuples if you want to try it to see if it fixes your problem. I haven't had time to test it with generics, but you don't have that here.

[westy92]

@sandersn I got the same error using your branch. Do I need to tweak my above code?

[sandersn]

Yes, you'll need to cast to a tuple of some length that is greater than the smallest date length, but I think even [number] would suffice. ([] isn't a valid tuple type in typescript even though it's understood and would be correct here).

You'll also need to build Typescript yourself and compile from $typescript/built/local/tsc.js. I didn't update the last-known-good bits yet, so an npm install won't suffice.

[typescript-bot]

Automatically closing this issue for housekeeping purposes. The issue labels indicate that it is unactionable at the moment or has already been addressed.