36 lines
764 B
TypeScript
36 lines
764 B
TypeScript
// @strict: true
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// @declaration: true
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// A mapped type { [P in K]: X }, where K is a generic type, is related to
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// { [key: string]: Y } if X is related to Y.
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function f1<T, K extends string>(x: { [key: string]: T }, y: Record<K, T>) {
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x = y;
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y = x; // Error
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}
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function f2<T>(x: { [key: string]: T }, y: Record<string, T>) {
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x = y;
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y = x;
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}
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function f3<T, U, K extends string>(x: { [key: string]: T }, y: Record<K, U>) {
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x = y; // Error
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y = x; // Error
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}
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// Repro from #14548
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type Dictionary = {
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[key: string]: string;
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};
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interface IBaseEntity {
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name: string;
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properties: Dictionary;
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}
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interface IEntity<T extends string> extends IBaseEntity {
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properties: Record<T, string>;
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}
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