172 lines
5.6 KiB
TypeScript
172 lines
5.6 KiB
TypeScript
//// [overloadResolution.ts]
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class SomeBase {
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private n;
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public s: string;
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}
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class SomeDerived1 extends SomeBase {
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private m;
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}
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class SomeDerived2 extends SomeBase {
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private m;
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}
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class SomeDerived3 extends SomeBase {
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private m;
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}
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// Ambiguous call picks the first overload in declaration order
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function fn1(s: string): string;
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function fn1(s: number): number;
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function fn1() { return null; }
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var s = fn1(undefined);
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var s: string;
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// No candidate overloads found
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fn1({}); // Error
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// Generic and non - generic overload where generic overload is the only candidate when called with type arguments
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function fn2(s: string, n: number): number;
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function fn2<T>(n: number, t: T): T;
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function fn2() { return undefined; }
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var d = fn2<Date>(0, undefined);
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var d: Date;
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// Generic and non - generic overload where generic overload is the only candidate when called without type arguments
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var s = fn2(0, '');
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// Generic and non - generic overload where non - generic overload is the only candidate when called with type arguments
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fn2<Date>('', 0); // Error
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// Generic and non - generic overload where non - generic overload is the only candidate when called without type arguments
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fn2('', 0); // OK
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// Generic overloads with differing arity called without type arguments
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function fn3<T>(n: T): string;
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function fn3<T, U>(s: string, t: T, u: U): U;
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function fn3<T, U, V>(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 called with type arguments matching each overload type parameter count
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var s = fn3<number>(4);
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var s = fn3<string, string>('', '', '');
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var n = fn3<number, string, string>('', '', 3);
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// Generic overloads with differing arity called with type argument count that doesn't match any overload
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fn3<number, number, number, number>(); // Error
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// Generic overloads with constraints called with type arguments that satisfy the constraints
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function fn4<T extends string, U extends number>(n: T, m: U);
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function fn4<T extends number, U extends string>(n: T, m: U);
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function fn4() { }
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fn4<string, number>('', 3);
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fn4<string, number>(3, ''); // Error
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fn4<number, string>('', 3); // Error
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fn4<number, string>(3, '');
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// Generic overloads with constraints called without type arguments but 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<boolean, Date>(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); // Error
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fn4(null, true); // Error
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// Non - generic overloads where contextual typing of function arguments has errors
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function fn5(f: (n: string) => void): string;
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function fn5(f: (n: number) => void): number;
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function fn5() { return undefined; }
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var n = fn5((n) => n.toFixed());
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var s = fn5((n) => n.substr(0));
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//// [overloadResolution.js]
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var __extends = (this && this.__extends) || function (d, b) {
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for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
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function __() { this.constructor = d; }
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__.prototype = b.prototype;
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d.prototype = new __();
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};
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var SomeBase = (function () {
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function SomeBase() {
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}
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return SomeBase;
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})();
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var SomeDerived1 = (function (_super) {
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__extends(SomeDerived1, _super);
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function SomeDerived1() {
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_super.apply(this, arguments);
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}
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return SomeDerived1;
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})(SomeBase);
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var SomeDerived2 = (function (_super) {
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__extends(SomeDerived2, _super);
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function SomeDerived2() {
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_super.apply(this, arguments);
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}
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return SomeDerived2;
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})(SomeBase);
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var SomeDerived3 = (function (_super) {
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__extends(SomeDerived3, _super);
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function SomeDerived3() {
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_super.apply(this, arguments);
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}
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return SomeDerived3;
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})(SomeBase);
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function fn1() { return null; }
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var s = fn1(undefined);
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var s;
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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 d = fn2(0, undefined);
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var d;
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// Generic and non - generic overload where generic overload is the only candidate when called without type arguments
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var s = fn2(0, '');
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// Generic and non - generic overload where non - generic overload is the only candidate when called with type arguments
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fn2('', 0); // Error
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// Generic and non - generic overload where non - generic overload is the only candidate when called without type arguments
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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 called with type 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 called with type argument count that doesn't match any overload
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fn3(); // Error
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function fn4() { }
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fn4('', 3);
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fn4(3, ''); // Error
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fn4('', 3); // Error
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fn4(3, '');
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// Generic overloads with constraints called without type arguments but 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); // Error
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fn4(null, true); // Error
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function fn5() { return undefined; }
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var n = fn5(function (n) { return n.toFixed(); });
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var s = fn5(function (n) { return n.substr(0); });
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