File: defaultBestCommonTypesHaveDecls.ts

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node-typescript 3.3.3333-1
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var obj1: {};
obj1.length;

var obj2: Object;
obj2.length;

function concat<T>(x: T, y: T): T { return null; }
var result = concat(1, ""); // error
var elementCount = result.length; 

function concat2<T, U>(x: T, y: U) { return null; }
var result2 = concat2(1, ""); // result2 will be number|string
var elementCount2 = result.length;