PickType and OmitType

[piotrwitek]

PickType and OmitType

[piotrwitek]

I like this types, they are definitely useful.

For the name I would propose:

• PickByValue
• OmitByValue

I choose this name because regular pick is picking by key, and PickByValue is picking by the value, check the example below:

Examples:

type PickByValue<Base, Condition> = Pick<
  Base,
  { [Key in keyof Base]: Base[Key] extends Condition ? Key : never }[keyof Base]
>;

type Props2 = { name: string; 0: boolean };

type SomeProps1 = Pick<Props2, 0>;
// Expect: { 0: boolean }

type SomeProps2 = PickByValue<Props2, boolean>;
// Expect: { 0: boolean }

Accepting PR's.

[piotrwitek]

It's merged but I'm blocking the release for the moment. Mainly because there are few other API proposals and until all of them are sorted out I don't want to make a mistake and introduce some breaking changes in the process.

[ProdigySim]

What happened to these? It looks like they got merged, but then they were removed from index.ts... and are now difficult to import.

[zepatrik]

currently:

import { PickByValue, OmitByValue } from 'utility-types/dist/mapped-types'

[piotrwitek]

I'll have some time during weekend, so hopefully I can finish the proposal for this API and make it public

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