Svelte: Add experimental portable stories support

.circleci/config.yml

@@ -670,7 +670,7 @@ workflows:
             - build
           matrix:
             parameters:
-              directory: ["react", "vue3", "nextjs"]
+              directory: ["react", "vue3", "nextjs", "svelte"]
       # TODO: reenable once we find out the source of flakyness
       # - test-runner-dev:
       #     requires:
@@ -728,7 +728,7 @@ workflows:
             - build
           matrix:
             parameters:
-              directory: ["react", "vue3", "nextjs"]
+              directory: ["react", "vue3", "nextjs", "svelte"]
       - bench:
           parallelism: 5
           requires:
@@ -791,7 +791,7 @@ workflows:
             - build
           matrix:
             parameters:
-              directory: ["react", "vue3", "nextjs"]
+              directory: ["react", "vue3", "nextjs", "svelte"]
       - test-empty-init:
           requires:
             - build

code/lib/preview-api/src/modules/store/csf/portable-stories.ts

@@ -169,7 +169,7 @@ export function createPlaywrightTest<TFixture extends { extend: any }>(
 ): TFixture {
   return baseTest.extend({
     mount: async ({ mount, page }: any, use: any) => {
-      await use(async (storyRef: WrappedStoryRef) => {
+      await use(async (storyRef: WrappedStoryRef, ...restArgs: any) => {
         // load the story in the browser
         await page.evaluate(async (wrappedStoryRef: WrappedStoryRef) => {
           const unwrappedStoryRef = await globalThis.__pwUnwrapObject?.(wrappedStoryRef);
@@ -179,7 +179,7 @@ export function createPlaywrightTest<TFixture extends { extend: any }>(
         }, storyRef);
 
         // mount the story
-        const mountResult = await mount(storyRef);
+        const mountResult = await mount(storyRef, ...restArgs);
 
         // play the story in the browser
         await page.evaluate(async (wrappedStoryRef: WrappedStoryRef) => {

code/renderers/svelte/package.json

@@ -26,12 +26,19 @@
       "require": "./dist/index.js",
       "import": "./dist/index.mjs"
     },
+    "./experimental-playwright": {
+      "types": "./dist/playwright.d.ts",
+      "node": "./dist/playwright.js",
+      "require": "./dist/playwright.js",
+      "import": "./dist/playwright.mjs"
+    },
     "./preset": "./preset.js",
     "./dist/entry-preview.mjs": "./dist/entry-preview.mjs",
     "./dist/entry-preview-docs.mjs": "./dist/entry-preview-docs.mjs",
     "./package.json": "./package.json",
     "./internal/PreviewRender.svelte": "./dist/components/PreviewRender.svelte",
     "./internal/SlotDecorator.svelte": "./dist/components/SlotDecorator.svelte",
+    "./internal/AddStorybookIdDecorator.svelte": "./dist/components/AddStorybookIdDecorator.svelte",
     "./internal/createSvelte5Props": "./dist/createSvelte5Props.svelte.js"
   },
   "main": "dist/index.js",
@@ -62,8 +69,11 @@
   },
   "devDependencies": {
     "@sveltejs/vite-plugin-svelte": "^3.0.2",
+    "@testing-library/jest-dom": "^6.4.1",
+    "@testing-library/svelte": "patch:@testing-library/svelte@npm%3A4.1.0#~/.yarn/patches/@testing-library-svelte-npm-4.1.0-34b7037bc0.patch",
     "expect-type": "^0.15.0",
     "fs-extra": "^11.1.0",
+    "jsdom": "^24.0.0",
     "svelte": "^5.0.0-next.65",
     "svelte-check": "^3.6.4",
     "typescript": "^5.3.2"
@@ -83,7 +93,8 @@
       "./src/index.ts",
       "./src/preset.ts",
       "./src/entry-preview.ts",
-      "./src/entry-preview-docs.ts"
+      "./src/entry-preview-docs.ts",
+      "./src/playwright.ts"
     ],
     "platform": "browser"
   },

code/renderers/svelte/src/__test__/composeStories/AddWrapperDecorator.svelte

@@ -0,0 +1,3 @@
+<div style="margin: 3em;" data-testid="local-decorator">
+  <slot/>
+</div>

code/renderers/svelte/src/__test__/composeStories/Button.stories.ts

@@ -0,0 +1,152 @@
+import { expect, fn, userEvent, within } from '@storybook/test';
+import type { Meta, StoryFn as CSF2Story, StoryObj } from '../..';
+
+import LoaderStoryComponent from './LoaderStoryComponent.svelte';
+import InputFilledStoryComponent from './InputFilledStoryComponent.svelte';
+import StoryWithLocaleComponent from './StoryWithLocaleComponent.svelte';
+import AddWrapperDecorator from './AddWrapperDecorator.svelte';
+import CustomRenderComponent from './CustomRenderComponent.svelte';
+
+import Button from './Button.svelte';
+
+const meta = {
+  title: 'Example/Button',
+  component: Button,
+  argTypes: {
+    backgroundColor: { control: 'color' },
+    size: {
+      control: { type: 'select' },
+      options: ['small', 'medium', 'large'],
+    },
+  },
+  excludeStories: /.*ImNotAStory$/,
+} satisfies Meta<Button>;
+
+export default meta;
+type CSF3Story = StoryObj<typeof meta>;
+
+// For testing purposes. Should be ignored in ComposeStories
+export const ImNotAStory = 123;
+
+const Template: CSF2Story = (args) => ({
+  Component: Button,
+  props: args,
+});
+
+export const CSF2Secondary = Template.bind({});
+CSF2Secondary.args = {
+  label: 'label coming from story args!',
+  primary: false,
+};
+
+const getCaptionForLocale = (locale: string) => {
+  switch (locale) {
+    case 'es':
+      return 'Hola!';
+    case 'fr':
+      return 'Bonjour!';
+    case 'kr':
+      return '안녕하세요!';
+    case 'pt':
+      return 'Olá!';
+    default:
+      return 'Hello!';
+  }
+};
+
+export const CSF2StoryWithLocale: CSF2Story = (args, { globals }) => ({
+  Component: StoryWithLocaleComponent,
+  props: {
+    ...args,
+    locale: globals.locale,
+    label: getCaptionForLocale(globals.locale),
+  },
+});
+CSF2StoryWithLocale.storyName = 'WithLocale';
+
+export const CSF2StoryWithParamsAndDecorator = Template.bind({});
+CSF2StoryWithParamsAndDecorator.args = {
+  label: 'foo',
+};
+CSF2StoryWithParamsAndDecorator.parameters = {
+  layout: 'centered',
+};
+CSF2StoryWithParamsAndDecorator.decorators = [
+  () => ({
+    Component: AddWrapperDecorator,
+  }),
+];
+
+export const NewStory: CSF3Story = {
+  args: {
+    label: 'foo',
+    size: 'large',
+    primary: true,
+  },
+  decorators: [
+    () => ({
+      Component: AddWrapperDecorator,
+    }),
+  ],
+};
+
+export const CSF3Primary: CSF3Story = {
+  args: {
+    label: 'foo',
+    size: 'large',
+    primary: true,
+  },
+};
+
+export const CSF3Button: CSF3Story = {
+  args: { label: 'foo' },
+};
+
+export const CSF3ButtonWithRender: CSF3Story = {
+  ...CSF3Button,
+  render: (args) => ({
+    Component: CustomRenderComponent,
+    props: {
+      args,
+    },
+  }),
+};
+
+export const CSF3InputFieldFilled: CSF3Story = {
+  render: () => ({
+    Component: InputFilledStoryComponent,
+  }),
+  play: async ({ canvasElement, step }) => {
+    const canvas = within(canvasElement);
+    await step('Step label', async () => {
+      const inputEl = canvas.getByTestId('input');
+      await userEvent.type(inputEl, 'Hello world!');
+      await expect(inputEl).toHaveValue('Hello world!');
+    });
+  },
+};
+
+const mockFn = fn();
+export const LoaderStory: StoryObj<{ mockFn: (val: string) => string }> = {
+  args: {
+    mockFn,
+  },
+  loaders: [
+    async () => {
+      mockFn.mockReturnValueOnce('mockFn return value');
+      return {
+        value: 'loaded data',
+      };
+    },
+  ],
+  render: (args, { loaded }) => ({
+    Component: LoaderStoryComponent,
+    props: {
+      ...args,
+      loaded,
+    },
+  }),
+  play: async () => {
+    expect(mockFn).toHaveBeenCalledWith('render');
+  },
+};

code/renderers/svelte/src/__test__/composeStories/Button.svelte

@@ -0,0 +1,33 @@
+<script lang="ts">
+  /**
+   * Is this the principal call to action on the page?
+   */
+  export let primary = false;
+
+  /**
+   * What background color to use
+   */
+  export let backgroundColor: string | undefined = undefined;
+  /**
+   * How large should the button be?
+   */
+  export let size: 'small' | 'medium' | 'large' = 'medium';
+  /**
+   * Button contents
+   */
+  export let label: string = '';
+
+  $: mode = primary ? 'storybook-button--primary' : 'storybook-button--secondary';
+
+  $: style = backgroundColor ? `background-color: ${backgroundColor}` : '';
+</script>
+
+<button
+  type="button"
+  class={['storybook-button', `storybook-button--${size}`, mode].join(' ')}
+  {style}
+  on:click
+>
+  {label}
+  <slot/>
+</button>

code/renderers/svelte/src/__test__/composeStories/CustomRenderComponent.svelte

@@ -0,0 +1,10 @@
+<script>
+  import Button from './Button.svelte';
+
+  export let args;
+</script>
+
+<div>
+  <p data-testid="custom-render">I am a custom render function</p>
+  <Button {...args} />
+</div>

code/renderers/svelte/src/__test__/composeStories/InputFilledStoryComponent.svelte

@@ -0,0 +1 @@
+<input data-testid="input" />