18 lines
607 B
TypeScript
18 lines
607 B
TypeScript
export type DeepReadonly<T> = T extends any[] ? DeepReadonlyArray<T[number]> : T extends object ? DeepReadonlyObject<T> : T;
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type NonFunctionPropertyNames<T> = { [K in keyof T]: T[K] extends Function ? never : K }[keyof T];
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interface DeepReadonlyArray<T> extends ReadonlyArray<DeepReadonly<T>> {}
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type DeepReadonlyObject<T> = {
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readonly [P in NonFunctionPropertyNames<T>]: DeepReadonly<T[P]>;
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};
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type TypeName<T> =
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T extends string ? "string" :
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T extends number ? "number" :
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T extends boolean ? "boolean" :
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T extends undefined ? "undefined" :
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T extends Function ? "function" :
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"object";
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