Function wrapMethod

packages/core/src/utils/object.ts:92–112

(
  obj: O,
  field: T,
  wrapped: WrappedFunction,
  enumerable: boolean = true,
)

 * the rare case where we might patch a non-enumerable method.
 */
export function wrapMethod<O extends {}, T extends string & keyof O>(
  obj: O,
  field: T,
  wrapped: WrappedFunction,
  enumerable: boolean = true,
): void {
  const original = obj[field];
  if (typeof original !== 'function') {
    throw new Error(`Cannot wrap method: ${field} is not a function`);
  }
  if (getOriginalFunction(original)) {
    throw new Error(`Attempting to wrap method ${field} multiple times`);
  }
  markFunctionWrapped(wrapped, original);
  Object.defineProperty(obj, field, {
    writable: true,
    configurable: true,
    enumerable,
    value: wrapped,
  });
}

/**
 * This extracts the original function if available.  See