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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.
+
+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.
+
+@example
+```
+import {SetRequired} from 'type-fest';
+
+type Foo = {
+	a?: number;
+	b: string;
+	c?: boolean;
+}
+
+type SomeRequired = SetRequired<Foo, 'b' | 'c'>;
+// type SomeRequired = {
+// 	a?: number;
+// 	b: string; // Was already required and still is.
+// 	c: boolean; // Is now required.
+// }
+```
+*/
+export type SetRequired<BaseType, Keys extends keyof BaseType = keyof BaseType> =
+	// Pick just the keys that are not required from the base type.
+	Pick<BaseType, Exclude<keyof BaseType, Keys>> &
+	// Pick the keys that should be required from the base type and make them required.
+	Required<Pick<BaseType, Keys>> extends
+	// If `InferredType` extends the previous, then for each key, use the inferred type key.
+	infer InferredType
+		? {[KeyType in keyof InferredType]: InferredType[KeyType]}
+		: never;