Function getUntaintedMethod

packages/utils/src/index.ts:173–195

(
  key: K,
  instance: BasePrototypeCache[K],
  method: T,
)

// eslint-disable-next-line @typescript-eslint/no-explicit-any
const untaintedMethodCache: Record<string, BaseMethod<any>> = {};
export function getUntaintedMethod<
  K extends keyof BasePrototypeCache,
  T extends keyof BasePrototypeCache[K],
>(
  key: K,
  instance: BasePrototypeCache[K],
  method: T,
): BasePrototypeCache[K][T] {
  const cacheKey = `${key}.${String(method)}`;
  if (untaintedMethodCache[cacheKey])
    return untaintedMethodCache[cacheKey].bind(
      instance,
    ) as BasePrototypeCache[K][T];

  const untaintedPrototype = getUntaintedPrototype(key);
  const untaintedMethod = untaintedPrototype[method];

  if (typeof untaintedMethod !== 'function') return instance[method];

  untaintedMethodCache[cacheKey] = untaintedMethod as BaseMethod<K>;

  return untaintedMethod.bind(instance) as BasePrototypeCache[K][T];
}

export function ownerDocument(n: Node): Document | null {
  return getUntaintedAccessor('Node', n, 'ownerDocument');