100 lines
3 KiB
TypeScript
100 lines
3 KiB
TypeScript
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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class fn1 {
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constructor(s: string);
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constructor(s: number);
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constructor() { }
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}
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new fn1(undefined);
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// No candidate overloads found
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new 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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class fn2<T> {
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constructor(s: string, n: number);
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constructor(n: number, t: T);
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constructor() { }
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}
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var d = new fn2<Date>(0, undefined);
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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 = new 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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new fn2<Date>('', 0); // OK
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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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new fn2('', 0); // OK
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// Generic overloads with differing arity called without type arguments
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class fn3<T, U, V> {
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constructor(n: T);
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constructor(s: string, t: T, u: U);
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constructor(v: V, u: U, t: T);
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constructor() { }
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}
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new fn3(3);
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new fn3('', 3, '');
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new fn3(5, 5, 5);
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// Generic overloads with differing arity called with type arguments matching each overload type parameter count
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new fn3<number>(4); // Error
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new fn3<string, string>('', '', ''); // Error
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new 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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new 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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class fn4<T extends string, U extends number> {
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constructor(n: T, m: U);
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constructor() { }
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}
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new fn4<string, number>('', 3);
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new fn4<string, number>(3, ''); // Error
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new fn4<number, string>('', 3); // Error
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new fn4<number, string>(3, ''); // Error
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// Generic overloads with constraints called without type arguments but with types that satisfy the constraints
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new fn4('', 3);
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new fn4(3, ''); // Error
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new fn4(3, undefined); // Error
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new fn4('', null);
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// Generic overloads with constraints called with type arguments that do not satisfy the constraints
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new 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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new fn4(true, null); // Error
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new fn4(null, true); // Error
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// Non - generic overloads where contextual typing of function arguments has errors
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class fn5 {
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constructor(f: (n: string) => void);
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constructor(f: (n: number) => void);
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constructor() { return undefined; }
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}
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new fn5((n) => n.toFixed());
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new fn5((n) => n.substr(0));
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new fn5((n) => n.blah); // Error
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