Function isPlainObject

src/queryCore/core/utils.ts:393–417

(o: any)

// Copied from: https://github.com/jonschlinkert/is-plain-object
export function isPlainObject(o: any): o is Object {
  if (!hasObjectPrototype(o)) {
    return false
  }

  // If has modified constructor
  const ctor = o.constructor
  if (typeof ctor === 'undefined') {
    return true
  }

  // If has modified prototype
  const prot = ctor.prototype
  if (!hasObjectPrototype(prot)) {
    return false
  }

  // If constructor does not have an Object-specific method
  if (!prot.hasOwnProperty('isPrototypeOf')) {
    return false
  }

  // Most likely a plain Object
  return true
}

function hasObjectPrototype(o: any): boolean {
  return Object.prototype.toString.call(o) === '[object Object]'