77 lines
2.5 KiB
Plaintext
77 lines
2.5 KiB
Plaintext
==== tests/cases/conformance/types/typeRelationships/assignmentCompatibility/constructSignatureAssignabilityInInheritance.ts (1 errors) ====
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// Checking basic subtype relations with construct signatures
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module ConstructSignature {
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interface Base { // T
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// M's
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new (x: number): void; // BUG 842221
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new (x: number, y: number): number;
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}
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// S's
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interface I extends Base {
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// N's
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new (x: number): number; // satisfies subtype for both of base's call signatures
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new (x: number, y: number): boolean; // so this one hides the base type member that is identical modulo return types
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}
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interface Base2 { // T
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// M's
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new (x: number): number;
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}
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// S's
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interface I2 extends Base2 {
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// N's
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new (x: number): string; // error because return types don't match
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}
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// S's
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interface I3 extends Base2 {
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// N's
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new <T>(x: T): string; // ok, adds a new call signature
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}
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}
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module MemberWithConstructSignature {
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interface Base { // T
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// M's
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a: new (x: number) => void;
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a2: new (x: number, y: number) => void;
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a3: new <T>(x: T) => void;
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}
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var b: Base;
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var r = new b.a(1);
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// S's
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interface I extends Base {
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// N's
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a: new (x: number) => number; // ok because base returns void
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a2: new (x: number, y: number) => boolean; // ok because base returns void
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a3: new <T>(x: T) => string; // ok because base returns void
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}
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interface Base2 { // T
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// M's
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a: new (x: number) => number;
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a2: new <T>(x: T) => T;
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}
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// S's
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interface I2 extends Base2 {
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~~
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!!! Interface 'I2' incorrectly extends interface 'Base2':
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!!! Types of property 'a' are incompatible:
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!!! Type 'new (x: number) => string' is not assignable to type 'new (x: number) => number':
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!!! Type 'string' is not assignable to type 'number'.
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// N's
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a: new (x: number) => string; // error because base returns non-void;
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}
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// S's
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interface I3 extends Base2 {
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// N's
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a2: new <T>(x: T) => string; // error because base returns non-void;
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}
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} |