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33 lines
1.0 KiB
33 lines
1.0 KiB
3 years ago
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/**
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Create a type that makes the given keys required. The remaining keys are kept as is. The sister of the `SetOptional` type.
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Use-case: You want to define a single model where the only thing that changes is whether or not some of the keys are required.
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@example
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```
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import {SetRequired} from 'type-fest';
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type Foo = {
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a?: number;
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b: string;
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c?: boolean;
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}
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type SomeRequired = SetRequired<Foo, 'b' | 'c'>;
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// type SomeRequired = {
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// a?: number;
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// b: string; // Was already required and still is.
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// c: boolean; // Is now required.
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// }
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```
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*/
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export type SetRequired<BaseType, Keys extends keyof BaseType = keyof BaseType> =
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// Pick just the keys that are not required from the base type.
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Pick<BaseType, Exclude<keyof BaseType, Keys>> &
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// Pick the keys that should be required from the base type and make them required.
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Required<Pick<BaseType, Keys>> extends
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// If `InferredType` extends the previous, then for each key, use the inferred type key.
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infer InferredType
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? {[KeyType in keyof InferredType]: InferredType[KeyType]}
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: never;
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