Function mixSpecIntoComponent

lib/assets/react-source/development/react.js:29653–29764

* Mixin helper which handles policy validation and reserved * specification keys when building React classes.

(Constructor, spec)

	   * specification keys when building React classes.
	   */
	  function mixSpecIntoComponent(Constructor, spec) {
	    if (!spec) {
	      if (process.env.NODE_ENV !== 'production') {
	        var typeofSpec = typeof spec;
	        var isMixinValid = typeofSpec === 'object' && spec !== null;

	        if (process.env.NODE_ENV !== 'production') {
	          warning(
	            isMixinValid,
	            "%s: You're attempting to include a mixin that is either null " +
	              'or not an object. Check the mixins included by the component, ' +
	              'as well as any mixins they include themselves. ' +
	              'Expected object but got %s.',
	            Constructor.displayName || 'ReactClass',
	            spec === null ? null : typeofSpec
	          );
	        }
	      }

	      return;
	    }

	    _invariant(
	      typeof spec !== 'function',
	      "ReactClass: You're attempting to " +
	        'use a component class or function as a mixin. Instead, just use a ' +
	        'regular object.'
	    );
	    _invariant(
	      !isValidElement(spec),
	      "ReactClass: You're attempting to " +
	        'use a component as a mixin. Instead, just use a regular object.'
	    );

	    var proto = Constructor.prototype;
	    var autoBindPairs = proto.__reactAutoBindPairs;

	    // By handling mixins before any other properties, we ensure the same
	    // chaining order is applied to methods with DEFINE_MANY policy, whether
	    // mixins are listed before or after these methods in the spec.
	    if (spec.hasOwnProperty(MIXINS_KEY)) {
	      RESERVED_SPEC_KEYS.mixins(Constructor, spec.mixins);
	    }

	    for (var name in spec) {
	      if (!spec.hasOwnProperty(name)) {
	        continue;
	      }

	      if (name === MIXINS_KEY) {
	        // We have already handled mixins in a special case above.
	        continue;
	      }

	      var property = spec[name];
	      var isAlreadyDefined = proto.hasOwnProperty(name);
	      validateMethodOverride(isAlreadyDefined, name);