2852-omit-by-type.ts

/*
  2852 - OmitByType
  -------
  by jiangshan (@jiangshanmeta) #medium #object

  ### Question

  From ```T```, pick a set of properties whose type are not assignable to ```U```.

  For Example

  ```typescript
  type OmitBoolean = OmitByType<{
    name: string
    count: number
    isReadonly: boolean
    isEnable: boolean
  }, boolean> // { name: string; count: number }
  ```

  > View on GitHub: https://tsch.js.org/2852
*/

/* _____________ Your Code Here _____________ */

type OmitByType<T extends Record<PropertyKey, any>, U> = {
    [key in keyof T as (T[key] extends U ? never : key)]: T[key];
}

/* _____________ Test Cases _____________ */
import type { Equal, Expect } from '@type-challenges/utils'

interface Model {
    name: string
    count: number
    isReadonly: boolean
    isEnable: boolean
}

type cases = [
    Expect<Equal<OmitByType<Model, boolean>, { name: string; count: number }>>,
    Expect<Equal<OmitByType<Model, string>, { count: number; isReadonly: boolean; isEnable: boolean }>>,
    Expect<Equal<OmitByType<Model, number>, { name: string; isReadonly: boolean; isEnable: boolean }>>,
]

/* _____________ Further Steps _____________ */
/*
  > Share your solutions: https://tsch.js.org/2852/answer
  > View solutions: https://tsch.js.org/2852/solutions
  > More Challenges: https://tsch.js.org
*/