File: genericFunctionsWithOptionalParameters1.ts

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node-typescript 3.3.3333-1
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interface Utils {
   fold<T, S>(c?: Array<T>, folder?: (s: S, t: T) => T, init?: S): T;
}

var utils: Utils;

utils.fold(); // no error
utils.fold(null); // no error
utils.fold(null, null); // no error
utils.fold(null, null, null); // no error