Function isOneOf

src/test/helpers.ts:338–340

(value: V, arrayOfPossibilities: ReadonlyArray<V>)

/** Essentially Array:includes, but with tweaked types for checks on enums */
export function isOneOf<V>(value: V, arrayOfPossibilities: ReadonlyArray<V>) {
  return arrayOfPossibilities.includes(value as any);
}