File: typeParameterConstraintInstantiation.ts

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node-typescript 4.9.5%2Bds1-2
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// 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[]