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tests/cases/compiler/signatureLengthMismatchWithOptionalParameters.ts(5,8): error TS2345: Argument of type '(n: number, m: string) => void' is not assignable to parameter of type '(n?: number) => void'.
Target signature provides too few arguments. Expected 2 or more, but got 1.
==== tests/cases/compiler/signatureLengthMismatchWithOptionalParameters.ts (1 errors) ====
function callee(n: number | undefined, m: string) { }
function caller(arg: (n?: number) => void) { }
caller(callee);
~~~~~~
!!! error TS2345: Argument of type '(n: number, m: string) => void' is not assignable to parameter of type '(n?: number) => void'.
!!! error TS2345: Target signature provides too few arguments. Expected 2 or more, but got 1.
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