Type Alias ConditionalPick<Base, Condition>

ConditionalPick: Pick<Base, ConditionalKeys<Base, Condition>>

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.

Type Parameters

  • Base
  • Condition

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}

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