115 lines
6 KiB
Plaintext
115 lines
6 KiB
Plaintext
tests/cases/conformance/expressions/functionCalls/typeArgumentInference.ts(68,11): error TS2453: The type argument for type parameter 'T' cannot be inferred from the usage. Consider specifying the type arguments explicitly.
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Type argument candidate 'string' is not a valid type argument because it is not a supertype of candidate 'number'.
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tests/cases/conformance/expressions/functionCalls/typeArgumentInference.ts(82,11): error TS2453: The type argument for type parameter 'T' cannot be inferred from the usage. Consider specifying the type arguments explicitly.
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Type argument candidate '{ x: number; z: Date; }' is not a valid type argument because it is not a supertype of candidate '{ x: number; y: string; }'.
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Property 'z' is missing in type '{ x: number; y: string; }'.
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==== tests/cases/conformance/expressions/functionCalls/typeArgumentInference.ts (2 errors) ====
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// Generic call with no parameters
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function noParams<T>() { }
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noParams();
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noParams<string>();
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noParams<{}>();
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// Generic call with parameters but none use type parameter type
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function noGenericParams<T>(n: string) { }
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noGenericParams('');
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noGenericParams<number>('');
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noGenericParams<{}>('');
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// Generic call with multiple type parameters and only one used in parameter type annotation
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function someGenerics1<T, U>(n: T, m: number) { }
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someGenerics1(3, 4);
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someGenerics1<number, {}>(3, 4);
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// Generic call with argument of function type whose parameter is of type parameter type
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function someGenerics2a<T>(n: (x: T) => void) { }
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someGenerics2a((n: string) => n);
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someGenerics2a<string>((n: string) => n);
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someGenerics2a<string>((n) => n.substr(0));
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function someGenerics2b<T, U>(n: (x: T, y: U) => void) { }
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someGenerics2b((n: string, x: number) => n);
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someGenerics2b<string, number>((n: string, t: number) => n);
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someGenerics2b<string, number>((n, t) => n.substr(t * t));
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// Generic call with argument of function type whose parameter is not of type parameter type but body/return type uses type parameter
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function someGenerics3<T>(producer: () => T) { }
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someGenerics3(() => '');
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someGenerics3<Date>(() => undefined);
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someGenerics3<number>(() => 3);
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// 2 parameter generic call with argument 1 of type parameter type and argument 2 of function type whose parameter is of type parameter type
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function someGenerics4<T, U>(n: T, f: (x: U) => void) { }
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someGenerics4(4, () => null);
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someGenerics4<string, number>('', () => 3);
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someGenerics4<string, number>(null, null);
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// 2 parameter generic call with argument 2 of type parameter type and argument 1 of function type whose parameter is of type parameter type
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function someGenerics5<U, T>(n: T, f: (x: U) => void) { }
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someGenerics5(4, () => null);
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someGenerics5<number, string>('', () => 3);
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someGenerics5<string, number>(null, null);
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// Generic call with multiple arguments of function types that each have parameters of the same generic type
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function someGenerics6<A>(a: (a: A) => A, b: (b: A) => A, c: (c: A) => A) { }
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someGenerics6(n => n, n => n, n => n);
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someGenerics6<number>(n => n, n => n, n => n);
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someGenerics6<number>((n: number) => n, (n: number) => n, (n: number) => n);
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// Generic call with multiple arguments of function types that each have parameters of different generic type
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function someGenerics7<A, B, C>(a: (a: A) => A, b: (b: B) => B, c: (c: C) => C) { }
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someGenerics7(n => n, n => n, n => n);
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someGenerics7<number, string, number>(n => n, n => n, n => n);
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someGenerics7<number, string, number>((n: number) => n, (n: string) => n, (n: number) => n);
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// Generic call with argument of generic function type
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function someGenerics8<T>(n: T): T { return n; }
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var x = someGenerics8(someGenerics7);
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x<string, string, string>(null, null, null);
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// Generic call with multiple parameters of generic type passed arguments with no best common type
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function someGenerics9<T>(a: T, b: T, c: T): T {
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return null;
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}
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var a9a = someGenerics9('', 0, []);
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~~~~~~~~~~~~~
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!!! error TS2453: The type argument for type parameter 'T' cannot be inferred from the usage. Consider specifying the type arguments explicitly.
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!!! error TS2453: Type argument candidate 'string' is not a valid type argument because it is not a supertype of candidate 'number'.
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var a9a: {};
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var a9b = someGenerics9<{ a?: number; b?: string; }>({ a: 0 }, { b: '' }, null);
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var a9b: { a?: number; b?: string; };
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// Generic call with multiple parameters of generic type passed arguments with multiple best common types
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interface A91 {
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x: number;
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y?: string;
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}
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interface A92 {
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x: number;
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z?: Date;
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}
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var a9e = someGenerics9(undefined, { x: 6, z: new Date() }, { x: 6, y: '' });
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~~~~~~~~~~~~~
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!!! error TS2453: The type argument for type parameter 'T' cannot be inferred from the usage. Consider specifying the type arguments explicitly.
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!!! error TS2453: Type argument candidate '{ x: number; z: Date; }' is not a valid type argument because it is not a supertype of candidate '{ x: number; y: string; }'.
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!!! error TS2453: Property 'z' is missing in type '{ x: number; y: string; }'.
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var a9e: {};
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var a9f = someGenerics9<A92>(undefined, { x: 6, z: new Date() }, { x: 6, y: '' });
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var a9f: A92;
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// Generic call with multiple parameters of generic type passed arguments with a single best common type
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var a9d = someGenerics9({ x: 3 }, { x: 6 }, { x: 6 });
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var a9d: { x: number; };
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// Generic call with multiple parameters of generic type where one argument is of type 'any'
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var anyVar: any;
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var a = someGenerics9(7, anyVar, 4);
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var a: any;
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// Generic call with multiple parameters of generic type where one argument is [] and the other is not 'any'
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var arr = someGenerics9([], null, undefined);
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var arr: any[];
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