File: genericFunctionsWithOptionalParameters1.types

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=== tests/cases/compiler/genericFunctionsWithOptionalParameters1.ts ===
interface Utils {
   fold<T, S>(c?: Array<T>, folder?: (s: S, t: T) => T, init?: S): T;
>fold : <T, S>(c?: Array<T>, folder?: (s: S, t: T) => T, init?: S) => T
>c : T[]
>folder : (s: S, t: T) => T
>s : S
>t : T
>init : S
}

var utils: Utils;
>utils : Utils

utils.fold(); // no error
>utils.fold() : unknown
>utils.fold : <T, S>(c?: T[], folder?: (s: S, t: T) => T, init?: S) => T
>utils : Utils
>fold : <T, S>(c?: T[], folder?: (s: S, t: T) => T, init?: S) => T

utils.fold(null); // no error
>utils.fold(null) : unknown
>utils.fold : <T, S>(c?: T[], folder?: (s: S, t: T) => T, init?: S) => T
>utils : Utils
>fold : <T, S>(c?: T[], folder?: (s: S, t: T) => T, init?: S) => T

utils.fold(null, null); // no error
>utils.fold(null, null) : unknown
>utils.fold : <T, S>(c?: T[], folder?: (s: S, t: T) => T, init?: S) => T
>utils : Utils
>fold : <T, S>(c?: T[], folder?: (s: S, t: T) => T, init?: S) => T

utils.fold(null, null, null); // no error
>utils.fold(null, null, null) : unknown
>utils.fold : <T, S>(c?: T[], folder?: (s: S, t: T) => T, init?: S) => T
>utils : Utils
>fold : <T, S>(c?: T[], folder?: (s: S, t: T) => T, init?: S) => T