52 lines
1.5 KiB
Plaintext
52 lines
1.5 KiB
Plaintext
import type {IfAny} from './if-any';
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import type {IfNever} from './if-never';
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import type {IfNotAnyOrNever, RequireNone} from './internal';
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/**
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Requires all of the keys in the given object.
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*/
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type RequireAll<ObjectType, KeysType extends keyof ObjectType> = Required<Pick<ObjectType, KeysType>>;
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/**
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Create a type that requires all of the given keys or none of the given keys. The remaining keys are kept as is.
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Use-cases:
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- Creating interfaces for components with mutually-inclusive keys.
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The caveat with `RequireAllOrNone` is that TypeScript doesn't always know at compile time every key that will exist at runtime. Therefore `RequireAllOrNone` can't do anything to prevent extra keys it doesn't know about.
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@example
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```
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import type {RequireAllOrNone} from 'type-fest';
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type Responder = {
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text?: () => string;
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json?: () => string;
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secure: boolean;
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};
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const responder1: RequireAllOrNone<Responder, 'text' | 'json'> = {
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secure: true
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};
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const responder2: RequireAllOrNone<Responder, 'text' | 'json'> = {
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text: () => '{"message": "hi"}',
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json: () => '{"message": "ok"}',
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secure: true
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};
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```
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@category Object
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*/
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export type RequireAllOrNone<ObjectType, KeysType extends keyof ObjectType = keyof ObjectType> =
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IfNotAnyOrNever<ObjectType,
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IfNever<KeysType,
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ObjectType,
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_RequireAllOrNone<ObjectType, IfAny<KeysType, keyof ObjectType, KeysType>>
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>>;
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type _RequireAllOrNone<ObjectType, KeysType extends keyof ObjectType> = (
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| RequireAll<ObjectType, KeysType>
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| RequireNone<KeysType>
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) & Omit<ObjectType, KeysType>; // The rest of the keys.
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