1. function Component(props, context, updater) {
    2.   this.props = props;
    3.   this.context = context;
    4.   // If a component has string refs, we will assign a different object later.
    5.   this.refs = emptyObject;
    6.   // We initialize the default updater but the real one gets injected by the
    7.   // renderer.
    8.   this.updater = updater || ReactNoopUpdateQueue;
    9. }
    11. Component.prototype.isReactComponent = {};
    1. Component.prototype.setState = function(partialState, callback) {
    2.   if (
    3.     typeof partialState !== 'object' &&
    4.     typeof partialState !== 'function' &&
    5.     partialState != null
    6.   ) {
    7.     throw new Error(
    8.       'setState(...): takes an object of state variables to update or a ' +
    9.         'function which returns an object of state variables.',
    10.     );
    11.   }
    13.   this.updater.enqueueSetState(this, partialState, callback, 'setState');
    14. };
    1. Component.prototype.forceUpdate = function(callback) {
    2.   this.updater.enqueueForceUpdate(this, callback, 'forceUpdate');
    3. };
    1. function ComponentDummy() {}
    2. ComponentDummy.prototype = Component.prototype;