meteor/packages/check/jquery.js

// Copy of jQuery.isPlainObject for the server side from jQuery v1.11.2.

var class2type = {};

var toString = class2type.toString;

var hasOwn = class2type.hasOwnProperty;

var support = {};

// Populate the class2type map
_.each("Boolean Number String Function Array Date RegExp Object Error".split(" "), function(name, i) {
  class2type[ "[object " + name + "]" ] = name.toLowerCase();
});

jQuery = {
  isPlainObject: function( obj ) {
    var key;

    // Must be an Object.
    // Because of IE, we also have to check the presence of the constructor property.
    // Make sure that DOM nodes and window objects don't pass through, as well
    if ( !obj || jQuery.type(obj) !== "object" || obj.nodeType || jQuery.isWindow( obj ) ) {
      return false;
    }

    try {
      // Not own constructor property must be Object
      if ( obj.constructor &&
        !hasOwn.call(obj, "constructor") &&
        !hasOwn.call(obj.constructor.prototype, "isPrototypeOf") ) {
        return false;
      }
    } catch ( e ) {
      // IE8,9 Will throw exceptions on certain host objects #9897
      return false;
    }

    // Support: IE<9
    // Handle iteration over inherited properties before own properties.
    if ( support.ownLast ) {
      for ( key in obj ) {
        return hasOwn.call( obj, key );
      }
    }

    // Own properties are enumerated firstly, so to speed up,
    // if last one is own, then all properties are own.
    for ( key in obj ) {}

    return key === undefined || hasOwn.call( obj, key );
  },

  type: function( obj ) {
    if ( obj == null ) {
      return obj + "";
    }
    return typeof obj === "object" || typeof obj === "function" ?
      class2type[ toString.call(obj) ] || "object" :
      typeof obj;
  },

  isWindow: function( obj ) {
    /* jshint eqeqeq: false */
    return obj != null && obj == obj.window;
  }
};