rambda/_ts-toolbelt/src/Object/ExcludeKeys.ts

Lightweight faster alternative to Ramda

import {Keys} from './Keys'
import {Exclude} from '../Union/Exclude'
import {Match} from '../Any/_Internal'
import {Is} from '../Any/Is'
import {At} from './At'

type ExcludeMatch<O extends object, O1 extends object, match extends Match> = {
    [K in Keys<O>]: {
        1: never
        0: K
    }[Is<O[K], At<O1, K>, match>]
}[Keys<O>]

/** Exclude the keys of **`O1`** out of the keys of **`O`**
 * (If `match = 'default'`, no type checks are done)
 * @param O to remove the keys from
 * @param O1 to remove the keys out
 * @param match to change precision (?=`'default'`)
 * @returns **`keyof`**
 * @example
 * ```ts
 * ```
 */
export type ExcludeKeys<O extends object, O1 extends object, match extends Match = 'default'> = {
    'default'     : Exclude<keyof O, keyof O1>
    'implements->': ExcludeMatch<O,  O1, 'implements->'>
    'extends->'   : ExcludeMatch<O,  O1, 'extends->'>
    '<-implements': ExcludeMatch<O,  O1, '<-implements'>
    '<-extends'   : ExcludeMatch<O,  O1, '<-extends'>
    'equals'      : ExcludeMatch<O,  O1, 'equals'>
}[match]