How can I do constructor overloading in a implemented interface in TypeScript?

Question

I tried to overload the constructor of a class which implements an interface but I'm getting the following error:

[0] app/foo.ts(12,5): error TS2394: Overload signature is not compatible with function implementation.

Classes

export interface Item { time: number; } export class Foo implements Item { public time: number; public name: string; constructor(); constructor( time: number, name: string ) { this.time = id || -1 this.name = name || "" }; }

I found other similar questions (Constructor overload in TypeScript) but I'm missing something because it doesn't work. The typscript versions is 1.8.9.

Ryan Cavanaugh · Accepted Answer · 2016-04-11 19:34:34Z

The implementation signature is not visible. You need to declare all the overloads callers should see, then write the implementation body.

export interface Item { time: number; } export class Foo implements Item { public time: number; public name: string; constructor(); constructor( time: number, name: string ); constructor( time?: number, name?: string ) { this.time = id || -1 this.name = name || "" }; }

You can also read the TypeScript FAQ entry on this

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