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typescripttypescript2.1

Using Typescript spread operator results in compile error

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

Solution

  • 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.