11 lines
294 B
TypeScript
11 lines
294 B
TypeScript
interface Utils {
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fold<T, S>(c: Array<T>, folder?: (s: S, t: T) => T, init?: S): T;
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}
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var utils: Utils;
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utils.fold(); // error
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utils.fold(null); // no error
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utils.fold(null, null); // no error
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utils.fold(null, null, null); // error: Unable to invoke type with no call signatures
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