File: functionOverloads43.ts

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function foo(bar: { a:number }[]): number;
function foo(bar: { a:string }[]): string;
function foo([x]: { a:number | string }[]): string | number {
    if (x) {
        return x.a;
    }
    
    return undefined;
}

var x = foo([{a: "str"}]);
var y = foo([{a: 100}]);