55 lines
1.7 KiB
Plaintext
55 lines
1.7 KiB
Plaintext
==== tests/cases/conformance/types/typeRelationships/assignmentCompatibility/assignmentCompatWithNumericIndexer3.ts (3 errors) ====
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// Derived type indexer must be subtype of base type indexer
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interface Base { foo: string; }
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interface Derived extends Base { bar: string; }
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interface Derived2 extends Derived { baz: string; }
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class A {
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[x: number]: Derived;
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}
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var a: A;
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var b: { [x: number]: Base; };
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a = b; // error
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~
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!!! Type '{ [x: number]: Base; }' is not assignable to type 'A':
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!!! Index signatures are incompatible:
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!!! Type 'Base' is not assignable to type 'Derived':
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!!! Property 'bar' is missing in type 'Base'.
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b = a; // ok
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class B2 extends A {
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[x: number]: Derived2; // ok
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}
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var b2: { [x: number]: Derived2; };
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a = b2; // ok
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b2 = a; // error
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~~
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!!! Type 'A' is not assignable to type '{ [x: number]: Derived2; }':
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!!! Index signatures are incompatible:
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!!! Type 'Derived' is not assignable to type 'Derived2':
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!!! Property 'baz' is missing in type 'Derived'.
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module Generics {
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class A<T extends Derived> {
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[x: number]: T;
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}
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function foo<T extends Derived>() {
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var a: A<T>;
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var b: { [x: number]: Derived; };
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a = b; // error
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~
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!!! Type '{ [x: number]: Derived; }' is not assignable to type 'A<T>':
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!!! Index signatures are incompatible:
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!!! Type 'Derived' is not assignable to type 'T'.
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b = a; // ok
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var b2: { [x: number]: T; };
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a = b2; // ok
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b2 = a; // ok
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}
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} |