Vue: Add Vue 3 support

app/vue3/README.md

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+# Storybook for Vue 3
+
+Storybook for Vue 3 is a UI development environment for your Vue 3 components.
+With it, you can visualize different states of your UI components and develop them interactively.
+
+![Storybook Screenshot](https://github.com/storybookjs/storybook/blob/master/media/storybook-intro.gif)
+
+Storybook runs outside of your app.
+So you can develop UI components in isolation without worrying about app specific dependencies and requirements.
+
+## Getting Started
+
+```sh
+cd my-vue3-app
+npx -p @storybook/cli sb init
+```
+
+For more information visit: [storybook.js.org](https://storybook.js.org)
+
+---
+
+Storybook also comes with a lot of [addons](https://storybook.js.org/docs/vue3/configure/storybook-addons) and a great API to customize as you wish.
+You can also build a [static version](https://storybook.js.org/docs/vue3/workflows/publish-storybook) of your storybook and deploy it anywhere you want.
+
+## Extending the Vue application
+
+Storybook creates a [Vue 3 application](https://v3.vuejs.org/api/application-api.html#application-api) for your component preview, which can be imported as `import { app } from '@storybook/vue3'`.
+
+When using global custom components (`app.component`), directives (`app.directive`), extensions (`app.use`), or other application methods, you will need to configure those in the `./storybook/preview.js` file.
+
+For example:
+
+```js
+// .storybook/preview.js
+
+import { app } from '@storybook/vue3';
+
+app.use(MyPlugin);
+app.component('my-component', MyComponent);
+app.mixin({ /* My mixin */ });
+```

app/vue3/bin/build.js

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+#!/usr/bin/env node
+
+process.env.NODE_ENV = process.env.NODE_ENV || 'production';
+require('../dist/cjs/server/build');

app/vue3/bin/index.js

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+#!/usr/bin/env node
+
+require('../dist/cjs/server');

app/vue3/package.json

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+{
+  "name": "@storybook/vue3",
+  "version": "6.2.0-alpha.19",
+  "description": "Storybook for Vue 3: Develop Vue 3 Components in isolation with Hot Reloading.",
+  "keywords": [
+    "storybook"
+  ],
+  "homepage": "https://github.com/storybookjs/storybook/tree/master/app/vue3",
+  "bugs": {
+    "url": "https://github.com/storybookjs/storybook/issues"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/storybookjs/storybook.git",
+    "directory": "app/vue3"
+  },
+  "license": "MIT",
+  "main": "dist/cjs/client/index.js",
+  "module": "dist/esm/client/index.js",
+  "types": "dist/ts3.9/client/index.d.ts",
+  "typesVersions": {
+    "<3.8": {
+      "*": [
+        "dist/ts3.4/*"
+      ]
+    }
+  },
+  "bin": {
+    "build-storybook": "./bin/build.js",
+    "start-storybook": "./bin/index.js",
+    "storybook-server": "./bin/index.js"
+  },
+  "files": [
+    "bin/**/*",
+    "dist/**/*",
+    "README.md",
+    "*.js",
+    "*.d.ts"
+  ],
+  "scripts": {
+    "prepare": "node ../../scripts/prepare.js"
+  },
+  "dependencies": {
+    "@storybook/addons": "6.2.0-alpha.19",
+    "@storybook/core": "6.2.0-alpha.19",
+    "@types/webpack-env": "^1.16.0",
+    "core-js": "^3.8.2",
+    "global": "^4.4.0",
+    "react": "16.14.0",
+    "react-dom": "16.14.0",
+    "read-pkg-up": "^7.0.1",
+    "regenerator-runtime": "^0.13.7",
+    "ts-dedent": "^2.0.0",
+    "ts-loader": "^6.2.2",
+    "vue-docgen-api": "^4.34.2",
+    "vue-docgen-loader": "^1.5.0",
+    "webpack": "^4.46.0"
+  },
+  "devDependencies": {
+    "@types/node": "^14.14.20",
+    "@types/webpack": "^4.41.26",
+    "@vue/compiler-sfc": "^3.0.0",
+    "vue": "^3.0.0",
+    "vue-loader": "^16.0.0"
+  },
+  "peerDependencies": {
+    "@babel/core": "*",
+    "@vue/compiler-sfc": "^3.0.0",
+    "babel-loader": "^7.0.0 || ^8.0.0",
+    "vue": "^3.0.0",
+    "vue-loader": "^16.0.0"
+  },
+  "engines": {
+    "node": ">=10.13.0"
+  },
+  "publishConfig": {
+    "access": "public"
+  },
+  "gitHead": "ed19e4b88b0fbc36d10379149b7c98194254897e"
+}

app/vue3/src/client/index.ts

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+export {
+  storiesOf,
+  setAddon,
+  addDecorator,
+  addParameters,
+  configure,
+  getStorybook,
+  forceReRender,
+  raw,
+  app,
+} from './preview';
+
+export * from './preview/types-6-0';
+
+if (module && module.hot && module.hot.decline) {
+  module.hot.decline();
+}

app/vue3/src/client/preview/globals.ts

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+import { window } from 'global';
+
+window.STORYBOOK_REACT_CLASSES = {};
+window.STORYBOOK_ENV = 'vue3';

app/vue3/src/client/preview/index.ts

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+import { ConcreteComponent, Component, App, defineComponent, h } from 'vue';
+import { start } from '@storybook/core/client';
+import {
+  ClientStoryApi,
+  StoryFn,
+  DecoratorFunction,
+  StoryContext,
+  Loadable,
+} from '@storybook/addons';
+
+import './globals';
+import { IStorybookSection, StoryFnVueReturnType } from './types';
+
+import render, { storybookApp } from './render';
+
+const PROPS = 'STORYBOOK_PROPS';
+
+function prepare(story: StoryFnVueReturnType, innerStory?: ConcreteComponent): Component | null {
+  if (story == null) {
+    return null;
+  }
+
+  if (innerStory) {
+    return {
+      extends: story,
+      components: { story: innerStory },
+      props: innerStory.props,
+      inject: {
+        props: {
+          from: PROPS,
+          default: null,
+        },
+      },
+      provide() {
+        return {
+          [PROPS]: this.props || this.$props,
+        };
+      },
+    };
+  }
+
+  return defineComponent({
+    props: story.props,
+    inject: {
+      props: {
+        from: PROPS,
+        default: null,
+      },
+    },
+    render() {
+      return h(story, this.props || this.$props);
+    },
+  });
+}
+
+const defaultContext: StoryContext = {
+  id: 'unspecified',
+  name: 'unspecified',
+  kind: 'unspecified',
+  parameters: {},
+  args: {},
+  argTypes: {},
+  globals: {},
+};
+
+function decorateStory(
+  storyFn: StoryFn<StoryFnVueReturnType>,
+  decorators: DecoratorFunction<ConcreteComponent>[]
+): StoryFn<Component> {
+  return decorators.reduce(
+    (decorated: StoryFn<ConcreteComponent>, decorator) => (
+      context: StoryContext = defaultContext
+    ) => {
+      let story;
+
+      const decoratedStory = decorator(
+        ({ parameters, ...innerContext }: StoryContext = {} as StoryContext) => {
+          story = decorated({ ...context, ...innerContext });
+          return story;
+        },
+        context
+      );
+
+      if (!story) {
+        story = decorated(context);
+      }
+
+      if (decoratedStory === story) {
+        return story;
+      }
+
+      return prepare(decoratedStory, story);
+    },
+    (context) => prepare(storyFn(context))
+  );
+}
+const framework = 'vue3';
+
+interface ClientApi extends ClientStoryApi<StoryFnVueReturnType> {
+  setAddon(addon: any): void;
+  configure(loader: Loadable, module: NodeModule): void;
+  getStorybook(): IStorybookSection[];
+  clearDecorators(): void;
+  forceReRender(): void;
+  raw: () => any; // todo add type
+  load: (...args: any[]) => void;
+  app: App;
+}
+
+const api = start(render, { decorateStory });
+
+export const storiesOf: ClientApi['storiesOf'] = (kind, m) => {
+  return (api.clientApi.storiesOf(kind, m) as ReturnType<ClientApi['storiesOf']>).addParameters({
+    framework,
+  });
+};
+
+export const configure: ClientApi['configure'] = (...args) => api.configure(framework, ...args);
+export const { addDecorator } = api.clientApi;
+export const { addParameters } = api.clientApi;
+export const { clearDecorators } = api.clientApi;
+export const { setAddon } = api.clientApi;
+export const { forceReRender } = api;
+export const { getStorybook } = api.clientApi;
+export const { raw } = api.clientApi;
+export const app: ClientApi['app'] = storybookApp;

app/vue3/src/client/preview/render.ts

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+import type { Args } from '@storybook/addons';
+import dedent from 'ts-dedent';
+import { createApp, h, shallowRef, ComponentPublicInstance } from 'vue';
+import { RenderContext, StoryFnVueReturnType } from './types';
+
+const activeStoryComponent = shallowRef<StoryFnVueReturnType | null>(null);
+const activeProps = shallowRef<Args>({});
+
+let root: ComponentPublicInstance | null = null;
+
+export const storybookApp = createApp({
+  // If an end-user calls `unmount` on the app, we need to clear our root variable
+  unmounted() {
+    root = null;
+  },
+
+  setup() {
+    return () => {
+      if (!activeStoryComponent.value) throw new Error('TODO: No Vue3 story');
+      return h(activeStoryComponent.value, activeProps.value);
+    };
+  },
+});
+
+export default function render({
+  storyFn,
+  kind,
+  name,
+  args,
+  showMain,
+  showError,
+  showException,
+  forceRender,
+}: RenderContext) {
+  storybookApp.config.errorHandler = showException;
+
+  const element: StoryFnVueReturnType = storyFn();
+
+  if (!element) {
+    showError({
+      title: `Expecting a Vue component from the story: "${name}" of "${kind}".`,
+      description: dedent`
+        Did you forget to return the Vue component from the story?
+        Use "() => ({ template: '<my-comp></my-comp>' })" or "() => ({ components: MyComp, template: '<my-comp></my-comp>' })" when defining the story.
+      `,
+    });
+    return;
+  }
+
+  showMain();
+
+  activeStoryComponent.value = element;
+  activeProps.value = args;
+
+  if (!root) {
+    root = storybookApp.mount('#root');
+  }
+}

app/vue3/src/client/preview/types-6-0.ts

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+import { ConcreteComponent } from 'vue';
+import { Args as DefaultArgs, Annotations, BaseMeta, BaseStory } from '@storybook/addons';
+import { StoryFnVueReturnType } from './types';
+
+export type { Args, ArgTypes, Parameters, StoryContext } from '@storybook/addons';
+
+type VueComponent = ConcreteComponent;
+type VueReturnType = StoryFnVueReturnType;
+
+/**
+ * Metadata to configure the stories for a component.
+ *
+ * @see [Default export](https://storybook.js.org/docs/formats/component-story-format/#default-export)
+ */
+export type Meta<Args = DefaultArgs> = BaseMeta<VueComponent> & Annotations<Args, VueReturnType>;
+
+/**
+ * Story function that represents a component example.
+ *
+ * @see [Named Story exports](https://storybook.js.org/docs/formats/component-story-format/#named-story-exports)
+ */
+export type Story<Args = DefaultArgs> = BaseStory<Args, VueReturnType> &
+  Annotations<Args, VueReturnType>;

app/vue3/src/client/preview/types.ts

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+import { ConcreteComponent } from 'vue';
+
+export { RenderContext } from '@storybook/core';
+
+export interface ShowErrorArgs {
+  title: string;
+  description: string;
+}
+
+export type StoryFnVueReturnType = ConcreteComponent;
+
+export interface IStorybookStory {
+  name: string;
+  render: () => any;
+}
+
+export interface IStorybookSection {
+  kind: string;
+  stories: IStorybookStory[];
+}

app/vue3/src/server/build.ts

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+import { buildStatic } from '@storybook/core/server';
+import options from './options';
+
+buildStatic(options);