File: typeParameterConstraintInstantiation.js

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node-typescript 3.3.3333-1
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//// [typeParameterConstraintInstantiation.ts]
// Check that type parameter constraints are properly instantiated

interface Mapper<T> {
    map<U extends T, V extends U[]>(f: (item: T) => U): V;
}

var m: Mapper<string>;
var a = m.map((x: string) => x);  // string[]


//// [typeParameterConstraintInstantiation.js]
// Check that type parameter constraints are properly instantiated
var m;
var a = m.map(function (x) { return x; }); // string[]