22 lines
667 B
Plaintext
22 lines
667 B
Plaintext
import type {ReadonlyKeysOf} from './readonly-keys-of';
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/**
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Creates a type that represents `true` or `false` depending on whether the given type has any readonly fields.
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This is useful when you want to create an API whose behavior depends on the presence or absence of readonly fields.
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@example
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```
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import type {HasReadonlyKeys, ReadonlyKeysOf} from 'type-fest';
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type UpdateService<Entity extends object> = {
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removeField: HasReadonlyKeys<Entity> extends true
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? (field: ReadonlyKeysOf<Entity>) => Promise<void>
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: never
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}
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```
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@category Utilities
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*/
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export type HasReadonlyKeys<BaseType extends object> = ReadonlyKeysOf<BaseType> extends never ? false : true;
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