45 lines
966 B
Plaintext
45 lines
966 B
Plaintext
|
import type {ConditionalKeys} from './conditional-keys';
|
||
|
|
||
|
/**
|
||
|
Pick keys from the shape that matches the given `Condition`.
|
||
|
|
||
|
This is useful when you want to create a new type from a specific subset of an existing type. For example, you might want to pick all the primitive properties from a class and form a new automatically derived type.
|
||
|
|
||
|
@example
|
||
|
```
|
||
|
import type {Primitive, ConditionalPick} from 'type-fest';
|
||
|
|
||
|
class Awesome {
|
||
|
name: string;
|
||
|
successes: number;
|
||
|
failures: bigint;
|
||
|
|
||
|
run() {}
|
||
|
}
|
||
|
|
||
|
type PickPrimitivesFromAwesome = ConditionalPick<Awesome, Primitive>;
|
||
|
//=> {name: string; successes: number; failures: bigint}
|
||
|
```
|
||
|
|
||
|
@example
|
||
|
```
|
||
|
import type {ConditionalPick} from 'type-fest';
|
||
|
|
||
|
interface Example {
|
||
|
a: string;
|
||
|
b: string | number;
|
||
|
c: () => void;
|
||
|
d: {};
|
||
|
}
|
||
|
|
||
|
type StringKeysOnly = ConditionalPick<Example, string>;
|
||
|
//=> {a: string}
|
||
|
```
|
||
|
|
||
|
@category Object
|
||
|
*/
|
||
|
export type ConditionalPick<Base, Condition> = Pick<
|
||
|
Base,
|
||
|
ConditionalKeys<Base, Condition>
|
||
|
>;
|