Overloaded Declaration Causes Build Error

Question

I have supplied the overloaded declaration for postMessage to represent the message-only signature (rather than the lib.d.ts three-argument version).

declare function postMessage(message: any): void;

I get no visual errors, red squiggles etc, but I do get a build error.

Build: Supplied parameters do not match any signature of call target.

Build: Could not select overload for 'call' expression.

On this line:

postMessage(message);

Is this a bug in selecting the overload I supplied or am I doing something stupid?

Answer 1

Seems like a valid bug report for the compler. The following works fine:

declare function foo(message: any, targetOrigin: string, ports?: any): void;
declare function foo(message: any): void;

foo('asdf');

But the following will error on compile

declare function postMessage(message: any): void;
postMessage('asdf');

Same for other functions at the root of lib.d.ts e.g.:

declare function blur(message: any): void;
blur('asdf');

It is almost as if the declare isn't even parsed. The following gives the same error :

postMessage('asdf');

Momentary solution

use the no-default-lib reference tag :

/// <reference no-default-lib="true"/>
declare function postMessage(message: any): void;
postMessage('asdf');