Type Alias SetRequired<BaseType, Keys>

SetRequired: (
    BaseType extends (...arguments_: never) => any
        ? (...arguments_: Parameters<BaseType>) => ReturnType<BaseType>
        : unknown
) & _SetRequired<BaseType, Keys>

Create a type that makes the given keys required, while keeping the remaining keys 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 required.

Type Parameters

BaseType
Keys extends keyof BaseType

Example

import type {SetRequired} from 'type-fest';

type Foo = {
	a?: number;
	b: string;
	c?: boolean;
};

type SomeRequired = SetRequired<Foo, 'b' | 'c'>;
//=> {a?: number; b: string; c: boolean}

// Set specific indices in an array to be required.
type ArrayExample = SetRequired<[number?, number?, number?], 0 | 1>;
//=> [number, number, number?]