@zedux/core/src/api/isPlainObject.ts

A high-level, declarative, composable form of Redux

/**
 * Checks whether the passed value is a plain old object.
 *
 * The object may originate from another realm or have its prototype explicitly
 * set to Object.prototype, but it may not have a null prototype or prototype
 * chain more than 1 layer deep.
 */
export const isPlainObject = (value: any) => {
  if (typeof value !== 'object' || !value) return false

  const prototype = Object.getPrototypeOf(value)
  if (!prototype) return false // it was created with Object.create(null)

  // If the prototype chain is exactly 1 layer deep, it's likely a normal object
  return Object.getPrototypeOf(prototype) === null
}