40 lines
1.1 KiB
Plaintext
40 lines
1.1 KiB
Plaintext
/**
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Create a type that makes the given keys non-nullable, where the remaining keys are kept as is.
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If no keys are given, all keys will be made non-nullable.
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Use-case: You want to define a single model where the only thing that changes is whether or not some or all of the keys are non-nullable.
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@example
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```
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import type {SetNonNullable} from 'type-fest';
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type Foo = {
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a: number | null;
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b: string | undefined;
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c?: boolean | null;
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}
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type SomeNonNullable = SetNonNullable<Foo, 'b' | 'c'>;
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// type SomeNonNullable = {
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// a: number | null;
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// b: string; // Can no longer be undefined.
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// c?: boolean; // Can no longer be null, but is still optional.
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// }
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type AllNonNullable = SetNonNullable<Foo>;
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// type AllNonNullable = {
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// a: number; // Can no longer be null.
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// b: string; // Can no longer be undefined.
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// c?: boolean; // Can no longer be null, but is still optional.
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// }
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```
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@category Object
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*/
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export type SetNonNullable<BaseType, Keys extends keyof BaseType = keyof BaseType> = {
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[Key in keyof BaseType]: Key extends Keys
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? NonNullable<BaseType[Key]>
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: BaseType[Key];
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};
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