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Contents
import type {Except} from './except';
import type {Simplify} from './simplify';
/**
Create a type that makes the given keys non-nullable. The remaining keys are kept as is.
Use-case: You want to define a single model where the only thing that changes is whether or not some of the keys are non-nullable.
@example
```
import type {SetNonNullable} from 'type-fest';
type Foo = {
a: number;
b: string | undefined;
c?: boolean | null;
}
type SomeNonNullable = SetNonNullable<Foo, 'b' | 'c'>;
// type SomeNonNullable = {
// a: number;
// b: string; // Can no longer be undefined.
// c?: boolean; // Can no longer be null, but is still optional.
// }
```
@category Object
*/
export type SetNonNullable<BaseType, Keys extends keyof BaseType> =
Simplify<
// Pick just the keys that are readonly from the base type.
Except<BaseType, Keys> &
// Pick the keys that should be non-nullable from the base type and make them non-nullable.
{[Key in Keys]: NonNullable<BaseType[Key]>}
>;
Version data entries
33 entries across 33 versions & 1 rubygems