[WIP] (#1736) ability to force re-render a story

app/angular/src/client/preview/index.js

@@ -53,3 +53,5 @@ const renderUI = () => {
 };
 
 reduxStore.subscribe(renderUI);
+
+export const forceReRender = () => render(context, true);

app/angular/src/client/preview/render.js

@@ -22,7 +22,7 @@ export function renderException(error) {
   logger.error(error.stack);
 }
 
-export function renderMain(data, storyStore) {
+export function renderMain(data, storyStore, forceRender) {
   if (storyStore.size() === 0) return null;
 
   const { selectedKind, selectedStory } = data;
@@ -39,7 +39,7 @@ export function renderMain(data, storyStore) {
   //    https://github.com/storybooks/react-storybook/issues/116
 
   const reRender = selectedKind !== previousKind || previousStory !== selectedStory;
-  if (reRender) {
+  if (reRender || forceRender) {
     // We need to unmount the existing set of components in the DOM node.
     // Otherwise, React may not recrease instances for every story run.
     // This could leads to issues like below:
@@ -54,14 +54,14 @@ export function renderMain(data, storyStore) {
   return renderNgApp(story, context, reRender);
 }
 
-export default function renderPreview({ reduxStore, storyStore }) {
+export default function renderPreview({ reduxStore, storyStore }, forceRender = false) {
   const state = reduxStore.getState();
   if (state.error) {
     return renderException(state.error);
   }
 
   try {
-    return renderMain(state, storyStore);
+    return renderMain(state, storyStore, forceRender);
   } catch (ex) {
     return renderException(ex);
   }

app/react/src/client/index.js

@@ -4,7 +4,14 @@ import deprecate from 'util-deprecate';
 import { action as deprecatedAction } from '@storybook/addon-actions';
 import { linkTo as deprecatedLinkTo } from '@storybook/addon-links';
 
-export { storiesOf, setAddon, addDecorator, configure, getStorybook } from './preview';
+export {
+  storiesOf,
+  setAddon,
+  addDecorator,
+  configure,
+  getStorybook,
+  forceReRender,
+} from './preview';
 
 export const action = deprecate(
   deprecatedAction,

app/react/src/client/preview/index.js

@@ -21,7 +21,9 @@ const isBrowser =
   !(navigator.userAgent.indexOf('jsdom') > -1);
 
 const storyStore = new StoryStore();
+/* eslint-disable no-underscore-dangle */
 const reduxStore = createStore(reducer);
+/* eslint-enable */
 const context = { storyStore, reduxStore };
 
 if (isBrowser) {
@@ -54,3 +56,5 @@ const renderUI = () => {
 };
 
 reduxStore.subscribe(renderUI);
+
+export const forceReRender = () => render(context, true);

app/react/src/client/preview/render.js

@@ -39,7 +39,7 @@ export function renderException(error) {
   logger.error(error.stack);
 }
 
-export function renderMain(data, storyStore) {
+export function renderMain(data, storyStore, forceRender) {
   if (storyStore.size() === 0) return null;
 
   const NoPreview = () => <p>No Preview Available!</p>;
@@ -60,6 +60,7 @@ export function renderMain(data, storyStore) {
   // However, we do want the story to re-render if the store itself has changed
   // (which happens at the moment when HMR occurs)
   if (
+    !forceRender &&
     revision === previousRevision &&
     selectedKind === previousKind &&
     previousStory === selectedStory
@@ -109,14 +110,14 @@ export function renderMain(data, storyStore) {
   return null;
 }
 
-export default function renderPreview({ reduxStore, storyStore }) {
+export default function renderPreview({ reduxStore, storyStore }, forceRender = false) {
   const state = reduxStore.getState();
   if (state.error) {
     return renderException(state.error);
   }
 
   try {
-    return renderMain(state, storyStore);
+    return renderMain(state, storyStore, forceRender);
   } catch (ex) {
     return renderException(ex);
   }

app/vue/src/client/preview/index.js

@@ -54,3 +54,5 @@ const renderUI = () => {
 };
 
 reduxStore.subscribe(renderUI);
+
+export const forceReRender = () => render(context, true);

app/vue/src/client/preview/render.js

@@ -49,7 +49,7 @@ function renderRoot(options) {
   app = new Vue(options);
 }
 
-export function renderMain(data, storyStore) {
+export function renderMain(data, storyStore, forceRender) {
   if (storyStore.size() === 0) return;
 
   const { selectedKind, selectedStory } = data;
@@ -60,7 +60,7 @@ export function renderMain(data, storyStore) {
   // renderMain() gets executed after each action. Actions will cause the whole
   // story to re-render without this check.
   //    https://github.com/storybooks/react-storybook/issues/116
-  if (selectedKind !== previousKind || previousStory !== selectedStory) {
+  if (forceRender || selectedKind !== previousKind || previousStory !== selectedStory) {
     // We need to unmount the existing set of components in the DOM node.
     // Otherwise, React may not recrease instances for every story run.
     // This could leads to issues like below:
@@ -97,14 +97,14 @@ export function renderMain(data, storyStore) {
   });
 }
 
-export default function renderPreview({ reduxStore, storyStore }) {
+export default function renderPreview({ reduxStore, storyStore }, forceRender = false) {
   const state = reduxStore.getState();
   if (state.error) {
     return renderException(state.error);
   }
 
   try {
-    return renderMain(state, storyStore);
+    return renderMain(state, storyStore, forceRender);
   } catch (ex) {
     return renderException(ex);
   }

examples/cra-kitchen-sink/src/stories/__snapshots__/force-rerender.stories.storyshot

@@ -0,0 +1,7 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`Storyshots Force ReRender button 1`] = `
+<button>
+   Click me to increment: 0 
+</button>
+`;

examples/cra-kitchen-sink/src/stories/force-rerender.stories.js

@@ -0,0 +1,12 @@
+import React from 'react';
+import { storiesOf, forceReRender } from '@storybook/react';
+
+let count = 0;
+const increment = () => {
+  count += 1;
+  forceReRender();
+};
+
+storiesOf('Force ReRender', module).add('button', () => (
+  <button onClick={increment}> Click me to increment: {count} </button>
+));