84 lines
3.5 KiB
Plaintext
84 lines
3.5 KiB
Plaintext
==== tests/cases/conformance/types/typeRelationships/assignmentCompatibility/assignmentCompatWithCallSignaturesWithOptionalParameters.ts (7 errors) ====
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// call signatures in derived types must have the same or fewer optional parameters as the base type
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interface Base {
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a: () => number;
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a2: (x?: number) => number;
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a3: (x: number) => number;
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a4: (x: number, y?: number) => number;
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a5: (x?: number, y?: number) => number;
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a6: (x: number, y: number) => number;
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}
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var b: Base;
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var a: () => number;
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a = () => 1 // ok, same number of required params
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a = (x?: number) => 1; // ok, same number of required params
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a = (x: number) => 1; // error, too many required params
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~
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!!! Type '(x: number) => number' is not assignable to type '() => number'.
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a = b.a; // ok
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a = b.a2; // ok
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a = b.a3; // error
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~
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!!! Type '(x: number) => number' is not assignable to type '() => number'.
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a = b.a4; // error
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~
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!!! Type '(x: number, y?: number) => number' is not assignable to type '() => number'.
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a = b.a5; // ok
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a = b.a6; // error
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~
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!!! Type '(x: number, y: number) => number' is not assignable to type '() => number'.
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var a2: (x?: number) => number;
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a2 = () => 1; // ok, same number of required params
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a2 = (x?: number) => 1; // ok, same number of required params
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a2 = (x: number) => 1; // ok, same number of params
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a2 = b.a; // ok
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a2 = b.a2; // ok
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a2 = b.a3; // ok, same number of params
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a2 = b.a4; // ok, excess params are optional in b.a3
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a2 = b.a5; // ok
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a2 = b.a6; // error
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~~
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!!! Type '(x: number, y: number) => number' is not assignable to type '(x?: number) => number'.
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var a3: (x: number) => number;
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a3 = () => 1; // ok, fewer required params
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a3 = (x?: number) => 1; // ok, fewer required params
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a3 = (x: number) => 1; // ok, same number of required params
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a3 = (x: number, y: number) => 1; // error, too many required params
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~~
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!!! Type '(x: number, y: number) => number' is not assignable to type '(x: number) => number'.
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a3 = b.a; // ok
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a3 = b.a2; // ok
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a3 = b.a3; // ok
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a3 = b.a4; // ok
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a3 = b.a5; // ok
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a3 = b.a6; // error
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~~
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!!! Type '(x: number, y: number) => number' is not assignable to type '(x: number) => number'.
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var a4: (x: number, y?: number) => number;
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a4 = () => 1; // ok, fewer required params
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a4 = (x?: number, y?: number) => 1; // ok, fewer required params
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a4 = (x: number) => 1; // ok, same number of required params
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a4 = (x: number, y: number) => 1; // ok, same number of params
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a4 = b.a; // ok
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a4 = b.a2; // ok
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a4 = b.a3; // ok
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a4 = b.a4; // ok
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a4 = b.a5; // ok
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a4 = b.a6; // ok, same number of params
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var a5: (x?: number, y?: number) => number;
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a5 = () => 1; // ok, fewer required params
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a5 = (x?: number, y?: number) => 1; // ok, fewer required params
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a5 = (x: number) => 1; // ok, fewer params in lambda
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a5 = (x: number, y: number) => 1; // ok, same number of params
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a5 = b.a; // ok
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a5 = b.a2; // ok
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a5 = b.a3; // ok, fewer params in b.a3
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a5 = b.a4; // ok, same number of params
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a5 = b.a5; // ok
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a5 = b.a6; // ok, same number of params |