Using VS17RC with TS 2.1
function foo(x:number, y:number, z:number) { console.log(x + y + z)}
var args = [0, 1, 2];
foo(...args);
gives the compile time error "Supplied parameters do not match any signature of call target."
This is the compiled js:
function foo(x, y, z) { console.log(x + y + z); }
var args = [0, 1, 2];
foo.apply(void 0, args);
which does in fact work.
Is there something I am doing wrong here?
The example comes from here: Typescript Deep Dive
There's an open issue on the exact same example:
Compiler incorrectly reports parameter/call target signature mismatch when using the spread operator
The issue is marked as bug, but it's there from Aug 3, 2015, and has no set milestone.
This is my workaround for it:
/**
* Function definition
*/
class SockService {
connect(...args:Array<string>) {
if (args.length > 1) {
[this.host, this.path] = args;
}
}
}
/**
* Function usage
*/
var endpoint = {
'local_test': [] as Array<string>,
'local': ['0.0.0.0:8080', '/foo/websocket'],
'production': ['192.0.2.1:8080', '/foo/websocket']
};
this.sock.connect(...endpoint.local_test);
I don't like using rest parameters like this, as it makes the function definition much less descriptive. But it's the only way I've gotten spread to work with function arguments in TypeScript.
