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[dotfiles/.git] / .config / coc / extensions / node_modules / coc-prettier / node_modules / @eslint / eslintrc / node_modules / type-fest / source / set-optional.d.ts

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+/**
+Create a type that makes the given keys optional. The remaining keys are kept as is. The sister of the `SetRequired` 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 optional.
+
+@example
+```
+import {SetOptional} from 'type-fest';
+
+type Foo = {
+       a: number;
+       b?: string;
+       c: boolean;
+}
+
+type SomeOptional = SetOptional<Foo, 'b' | 'c'>;
+// type SomeOptional = {
+//     a: number;
+//     b?: string; // Was already optional and still is.
+//     c?: boolean; // Is now optional.
+// }
+```
+*/
+export type SetOptional<BaseType, Keys extends keyof BaseType = keyof BaseType> =
+       // Pick just the keys that are not optional from the base type.
+       Pick<BaseType, Exclude<keyof BaseType, Keys>> &
+       // Pick the keys that should be optional from the base type and make them optional.
+       Partial<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;