114 lines
4.4 KiB
TypeScript
114 lines
4.4 KiB
TypeScript
//// [taggedTemplateStringsWithOverloadResolution3_ES6.ts]
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// Ambiguous call picks the first overload in declaration order
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function fn1(strs: TemplateStringsArray, s: string): string;
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function fn1(strs: TemplateStringsArray, n: number): number;
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function fn1() { return null; }
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var s: string = fn1 `${ undefined }`;
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// No candidate overloads found
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fn1 `${ {} }`; // Error
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function fn2(strs: TemplateStringsArray, s: string, n: number): number;
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function fn2<T>(strs: TemplateStringsArray, n: number, t: T): T;
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function fn2() { return undefined; }
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var d1: Date = fn2 `${ 0 }${ undefined }`; // contextually typed
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var d2 = fn2 `${ 0 }${ undefined }`; // any
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d1.foo(); // error
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d2(); // no error (typed as any)
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// Generic and non-generic overload where generic overload is the only candidate
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fn2 `${ 0 }${ '' }`; // OK
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// Generic and non-generic overload where non-generic overload is the only candidate
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fn2 `${ '' }${ 0 }`; // OK
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// Generic overloads with differing arity
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function fn3<T>(strs: TemplateStringsArray, n: T): string;
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function fn3<T, U>(strs: TemplateStringsArray, s: string, t: T, u: U): U;
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function fn3<T, U, V>(strs: TemplateStringsArray, v: V, u: U, t: T): number;
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function fn3() { return null; }
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var s = fn3 `${ 3 }`;
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var s = fn3 `${'' }${ 3 }${ '' }`;
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var n = fn3 `${ 5 }${ 5 }${ 5 }`;
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var n: number;
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// Generic overloads with differing arity tagging with arguments matching each overload type parameter count
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var s = fn3 `${ 4 }`
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var s = fn3 `${ '' }${ '' }${ '' }`;
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var n = fn3 `${ '' }${ '' }${ 3 }`;
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// Generic overloads with differing arity tagging with argument count that doesn't match any overload
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fn3 ``; // Error
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// Generic overloads with constraints
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function fn4<T extends string, U extends number>(strs: TemplateStringsArray, n: T, m: U);
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function fn4<T extends number, U extends string>(strs: TemplateStringsArray, n: T, m: U);
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function fn4(strs: TemplateStringsArray)
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function fn4() { }
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// Generic overloads with constraints tagged with types that satisfy the constraints
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fn4 `${ '' }${ 3 }`;
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fn4 `${ 3 }${ '' }`;
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fn4 `${ 3 }${ undefined }`;
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fn4 `${ '' }${ null }`;
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// Generic overloads with constraints called with type arguments that do not satisfy the constraints
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fn4 `${ null }${ null }`; // Error
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// Generic overloads with constraints called without type arguments but with types that do not satisfy the constraints
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fn4 `${ true }${ null }`;
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fn4 `${ null }${ true }`;
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// Non - generic overloads where contextual typing of function arguments has errors
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function fn5(strs: TemplateStringsArray, f: (n: string) => void): string;
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function fn5(strs: TemplateStringsArray, f: (n: number) => void): number;
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function fn5() { return undefined; }
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fn5 `${ (n) => n.toFixed() }`; // will error; 'n' should have type 'string'.
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fn5 `${ (n) => n.substr(0) }`;
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//// [taggedTemplateStringsWithOverloadResolution3_ES6.js]
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function fn1() { return null; }
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var s = fn1 `${undefined}`;
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// No candidate overloads found
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fn1 `${{}}`; // Error
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function fn2() { return undefined; }
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var d1 = fn2 `${0}${undefined}`; // contextually typed
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var d2 = fn2 `${0}${undefined}`; // any
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d1.foo(); // error
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d2(); // no error (typed as any)
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// Generic and non-generic overload where generic overload is the only candidate
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fn2 `${0}${''}`; // OK
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// Generic and non-generic overload where non-generic overload is the only candidate
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fn2 `${''}${0}`; // OK
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function fn3() { return null; }
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var s = fn3 `${3}`;
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var s = fn3 `${''}${3}${''}`;
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var n = fn3 `${5}${5}${5}`;
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var n;
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// Generic overloads with differing arity tagging with arguments matching each overload type parameter count
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var s = fn3 `${4}`;
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var s = fn3 `${''}${''}${''}`;
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var n = fn3 `${''}${''}${3}`;
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// Generic overloads with differing arity tagging with argument count that doesn't match any overload
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fn3 ``; // Error
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function fn4() { }
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// Generic overloads with constraints tagged with types that satisfy the constraints
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fn4 `${''}${3}`;
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fn4 `${3}${''}`;
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fn4 `${3}${undefined}`;
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fn4 `${''}${null}`;
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// Generic overloads with constraints called with type arguments that do not satisfy the constraints
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fn4 `${null}${null}`; // Error
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// Generic overloads with constraints called without type arguments but with types that do not satisfy the constraints
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fn4 `${true}${null}`;
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fn4 `${null}${true}`;
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function fn5() { return undefined; }
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fn5 `${(n) => n.toFixed()}`; // will error; 'n' should have type 'string'.
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fn5 `${(n) => n.substr(0)}`;
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