22 lines
657 B
TypeScript
22 lines
657 B
TypeScript
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type OriginalType = {
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key1: { sub1: string; sub2: string };
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key2: { subA: string; subB: string };
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};
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type ValidKeys = keyof OriginalType;
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type ValidSubKeys<K extends ValidKeys> = keyof OriginalType[K];
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type FixedLengthArray<T, L extends number> = [T, ...T[]] & { length: L };
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type EnforcedRecord<L extends number> = {
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[K in ValidKeys]: FixedLengthArray<ValidSubKeys<K>, L>;
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};
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// Example usage:
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const example: EnforcedRecord<2> = {
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key1: ['sub1', 'sub2'], // Valid
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key2: ['subA', 'subB'], // Valid
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// key1: ['sub1'], // Invalid, TypeScript will give an error
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// key2: ['subA', 'subB', 'subC'], // Invalid, TypeScript will give an error
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};
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