2852-omitbytype.ts

/**
 * 2852 - OmitByType
 *
 * 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 }
 * ```
 */

/* _____________ Your Code Here _____________ */

type OmitByType<T extends object, U extends T[keyof T]> = {
  [K in keyof T as T[K] extends U ? never : K]: T[K];
};

/* _____________ 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 }>>,
]