@feugene/mu/src/is/isPrototype.ts

Helpful TS utilities without dependencies

/** Used for built-in method references. */
import isFunction from './isFunction'

const objectProto = Object.prototype

/**
 * Checks if `value` is likely a prototype object.
 *
 * @private
 */
export default function isPrototype(value: any): boolean {
  const Ctor = value && value.constructor,
    proto = (isFunction(Ctor) && Ctor.prototype) || objectProto

  return value === proto
}