Function createClass

lib/assets/react-source/development/react.js:30016–30131

* Creates a composite component class given a class specification. * See https://facebook.github.io/react/docs/top-level-api.html#react.createclass * * @param {object} spec Class specification (which must define `render`). * @return {function} Component constructor function. * @p

(spec)

	   * @public
	   */
	  function createClass(spec) {
	    // To keep our warnings more understandable, we'll use a little hack here to
	    // ensure that Constructor.name !== 'Constructor'. This makes sure we don't
	    // unnecessarily identify a class without displayName as 'Constructor'.
	    var Constructor = identity(function(props, context, updater) {
	      // This constructor gets overridden by mocks. The argument is used
	      // by mocks to assert on what gets mounted.

	      if (process.env.NODE_ENV !== 'production') {
	        warning(
	          this instanceof Constructor,
	          'Something is calling a React component directly. Use a factory or ' +
	            'JSX instead. See: https://fb.me/react-legacyfactory'
	        );
	      }

	      // Wire up auto-binding
	      if (this.__reactAutoBindPairs.length) {
	        bindAutoBindMethods(this);
	      }

	      this.props = props;
	      this.context = context;
	      this.refs = emptyObject;
	      this.updater = updater || ReactNoopUpdateQueue;

	      this.state = null;

	      // ReactClasses doesn't have constructors. Instead, they use the
	      // getInitialState and componentWillMount methods for initialization.

	      var initialState = this.getInitialState ? this.getInitialState() : null;
	      if (process.env.NODE_ENV !== 'production') {
	        // We allow auto-mocks to proceed as if they're returning null.
	        if (
	          initialState === undefined &&
	          this.getInitialState._isMockFunction
	        ) {
	          // This is probably bad practice. Consider warning here and
	          // deprecating this convenience.
	          initialState = null;
	        }
	      }
	      _invariant(
	        typeof initialState === 'object' && !Array.isArray(initialState),
	        '%s.getInitialState(): must return an object or null',
	        Constructor.displayName || 'ReactCompositeComponent'
	      );

	      this.state = initialState;
	    });
	    Constructor.prototype = new ReactClassComponent();
	    Constructor.prototype.constructor = Constructor;
	    Constructor.prototype.__reactAutoBindPairs = [];

	    injectedMixins.forEach(mixSpecIntoComponent.bind(null, Constructor));

	    mixSpecIntoComponent(Constructor, IsMountedPreMixin);