79 lines
2.7 KiB
Plaintext
79 lines
2.7 KiB
Plaintext
tests/cases/conformance/types/typeRelationships/assignmentCompatibility/callSignatureAssignabilityInInheritance.ts(57,15): error TS2430: Interface 'I2' incorrectly extends interface 'Base2'.
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Types of property 'a' are incompatible.
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Type '(x: number) => string' is not assignable to type '(x: number) => number'.
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Type 'string' is not assignable to type 'number'.
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==== tests/cases/conformance/types/typeRelationships/assignmentCompatibility/callSignatureAssignabilityInInheritance.ts (1 errors) ====
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module CallSignature {
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interface Base { // T
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// M's
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(x: number): void;
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(x: number, y: number): void;
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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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(x: number): number; // ok because base returns void
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(x: number, y: number): boolean; // ok because base returns void
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<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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(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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(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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<T>(x: T): string; // ok, adds a new call signature
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}
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}
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module MemberWithCallSignature {
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interface Base { // T
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// M's
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a: (x: number) => void;
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a2: (x: number, y: number) => void;
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a3: <T>(x: T) => void;
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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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a: (x: number) => number; // ok because base returns void
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a2: (x: number, y: number) => boolean; // ok because base returns void
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a3: <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: (x: number) => number;
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a2: <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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!!! error TS2430: Interface 'I2' incorrectly extends interface 'Base2'.
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!!! error TS2430: Types of property 'a' are incompatible.
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!!! error TS2430: Type '(x: number) => string' is not assignable to type '(x: number) => number'.
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!!! error TS2430: Type 'string' is not assignable to type 'number'.
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// N's
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a: (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: <T>(x: T) => string; // error because base returns non-void;
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}
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} |