Function constructClassInstance

code/event-handlers/public/app.js:7698–7772

(workInProgress, props)

  }

  function constructClassInstance(workInProgress, props) {
    var ctor = workInProgress.type;
    var unmaskedContext = getUnmaskedContext(workInProgress);
    var needsContext = isContextConsumer(workInProgress);
    var context = needsContext ? getMaskedContext(workInProgress, unmaskedContext) : emptyObject;

    // Instantiate twice to help detect side-effects.
    if (debugRenderPhaseSideEffects || debugRenderPhaseSideEffectsForStrictMode && workInProgress.mode & StrictMode) {
      new ctor(props, context); // eslint-disable-line no-new
    }

    var instance = new ctor(props, context);
    var state = instance.state !== null && instance.state !== undefined ? instance.state : null;
    adoptClassInstance(workInProgress, instance);

    {
      if (typeof ctor.getDerivedStateFromProps === 'function') {
        if (state === null) {
          var componentName = getComponentName(workInProgress) || 'Component';
          if (!didWarnAboutUninitializedState[componentName]) {
            warning(false, '%s: Did not properly initialize state during construction. ' + 'Expected state to be an object, but it was %s.', componentName, instance.state === null ? 'null' : 'undefined');
            didWarnAboutUninitializedState[componentName] = true;
          }
        }

        // If getDerivedStateFromProps() is defined, "unsafe" lifecycles won't be called.
        // Warn about these lifecycles if they are present.
        // Don't warn about react-lifecycles-compat polyfilled methods though.
        var foundWillMountName = null;
        var foundWillReceivePropsName = null;
        var foundWillUpdateName = null;
        if (typeof instance.componentWillMount === 'function' && instance.componentWillMount.__suppressDeprecationWarning !== true) {
          foundWillMountName = 'componentWillMount';
        } else if (typeof instance.UNSAFE_componentWillMount === 'function') {
          foundWillMountName = 'UNSAFE_componentWillMount';
        }
        if (typeof instance.componentWillReceiveProps === 'function' && instance.componentWillReceiveProps.__suppressDeprecationWarning !== true) {
          foundWillReceivePropsName = 'componentWillReceiveProps';
        } else if (typeof instance.UNSAFE_componentWillReceiveProps === 'function') {
          foundWillReceivePropsName = 'UNSAFE_componentWillReceiveProps';
        }
        if (typeof instance.componentWillUpdate === 'function') {
          foundWillUpdateName = 'componentWillUpdate';
        } else if (typeof instance.UNSAFE_componentWillUpdate === 'function') {
          foundWillUpdateName = 'UNSAFE_componentWillUpdate';
        }
        if (foundWillMountName !== null || foundWillReceivePropsName !== null || foundWillUpdateName !== null) {
          var _componentName = getComponentName(workInProgress) || 'Component';
          if (!didWarnAboutLegacyLifecyclesAndDerivedState[_componentName]) {
            warning(false, 'Unsafe legacy lifecycles will not be called for components using ' + 'the new getDerivedStateFromProps() API.\n\n' + '%s uses getDerivedStateFromProps() but also contains the following legacy lifecycles:' + '%s%s%s\n\n' + 'The above lifecycles should be removed. Learn more about this warning here:\n' + 'https://fb.me/react-async-component-lifecycle-hooks', _componentName, foundWillMountName !== null ? '\n  ' + foundWillMountName : '', foundWillReceivePropsName !== null ? '\n  ' + foundWillReceivePropsName : '', foundWillUpdateName !== null ? '\n  ' + foundWillUpdateName : '');
            didWarnAboutLegacyLifecyclesAndDerivedState[_componentName] = true;
          }
        }
      }
    }

    workInProgress.memoizedState = state;