31 lines
1.6 KiB
Plaintext
31 lines
1.6 KiB
Plaintext
==== tests/cases/conformance/types/typeRelationships/typeInference/genericCallWithFunctionTypedArguments5.ts (2 errors) ====
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// Generic call with parameter of object type with member of function type of n args passed object whose associated member is call signature with n+1 args
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function foo<T, U>(arg: { cb: (t: T) => U }) {
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return arg.cb(null);
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}
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var arg = { cb: <T>(x: T) => '' };
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var r = foo(arg); // {}
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// more args not allowed
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var r2 = foo({ cb: <T>(x: T, y: T) => '' }); // error
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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!!! Argument of type '{ cb: <T>(x: T, y: T) => string; }' is not assignable to parameter of type '{ cb: (t: any) => string; }'.
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!!! Types of property 'cb' are incompatible:
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!!! Type '<T>(x: T, y: T) => string' is not assignable to type '(t: any) => string'.
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var r3 = foo({ cb: (x: string, y: number) => '' }); // error
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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!!! Argument of type '{ cb: (x: string, y: number) => string; }' is not assignable to parameter of type '{ cb: (t: string) => string; }'.
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!!! Types of property 'cb' are incompatible:
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!!! Type '(x: string, y: number) => string' is not assignable to type '(t: string) => string'.
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function foo2<T, U>(arg: { cb: (t: T, t2: T) => U }) {
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return arg.cb(null, null);
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}
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// fewer args ok
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var r4 = foo(arg); // {}
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var r5 = foo({ cb: <T>(x: T) => '' }); // {}
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var r6 = foo({ cb: (x: string) => '' }); // string
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var r7 = foo({ cb: () => '' }); // string
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