Vite: Don't prefix story import with @fs

code/builders/builder-vite/package.json

@@ -53,7 +53,9 @@
     "es-module-lexer": "^1.5.0",
     "find-cache-dir": "^3.0.0",
     "glob": "^10.0.0",
+    "knitwork": "^1.1.0",
     "magic-string": "^0.30.0",
+    "pathe": "^1.1.2",
     "polka": "^1.0.0-next.28",
     "sirv": "^2.0.4",
     "slash": "^5.0.0",

code/builders/builder-vite/src/codegen-importfn-script.test.ts

@@ -0,0 +1,56 @@
+import { beforeEach, describe, expect, it, vi } from 'vitest';
+
+import { toImportFn } from './codegen-importfn-script';
+
+describe('toImportFn', () => {
+  it('should correctly map story paths to import functions for absolute paths on Linux', async () => {
+    const root = '/absolute/path';
+    const stories = ['/absolute/path/to/story1.js', '/absolute/path/to/story2.js'];
+
+    const result = await toImportFn(root, stories);
+
+    expect(result).toMatchInlineSnapshot(`
+      "const importers = {
+        "./to/story1.js": () => import("/absolute/path/to/story1.js"),
+        "./to/story2.js": () => import("/absolute/path/to/story2.js")
+      };
+
+      export async function importFn(path) {
+        return await importers[path]();
+      }"
+    `);
+  });
+
+  it('should correctly map story paths to import functions for absolute paths on Windows', async () => {
+    const root = 'C:\\absolute\\path';
+    const stories = ['C:\\absolute\\path\\to\\story1.js', 'C:\\absolute\\path\\to\\story2.js'];
+
+    const result = await toImportFn(root, stories);
+
+    expect(result).toMatchInlineSnapshot(`
+      "const importers = {
+        "./to/story1.js": () => import("C:/absolute/path/to/story1.js"),
+        "./to/story2.js": () => import("C:/absolute/path/to/story2.js")
+      };
+
+      export async function importFn(path) {
+        return await importers[path]();
+      }"
+    `);
+  });
+
+  it('should handle an empty array of stories', async () => {
+    const root = '/absolute/path';
+    const stories: string[] = [];
+
+    const result = await toImportFn(root, stories);
+
+    expect(result).toMatchInlineSnapshot(`
+      "const importers = {};
+
+      export async function importFn(path) {
+        return await importers[path]();
+      }"
+    `);
+  });
+});

code/builders/builder-vite/src/codegen-importfn-script.ts

@@ -1,7 +1,9 @@
-import { relative } from 'node:path';
-
 import type { Options } from 'storybook/internal/types';
 
+import { genDynamicImport, genImport, genObjectFromRawEntries } from 'knitwork';
+import { normalize, relative } from 'pathe';
+import { dedent } from 'ts-dedent';
+
 import { listStories } from './list-stories';
 
 /**
@@ -21,34 +23,33 @@ function toImportPath(relativePath: string) {
 /**
  * This function takes an array of stories and creates a mapping between the stories' relative paths
  * to the working directory and their dynamic imports. The import is done in an asynchronous
- * function to delay loading. It then creates a function, `importFn(path)`, which resolves a path to
- * an import function and this is called by Storybook to fetch a story dynamically when needed.
+ * function to delay loading and to allow Vite to split the code into smaller chunks. It then
+ * creates a function, `importFn(path)`, which resolves a path to an import function and this is
+ * called by Storybook to fetch a story dynamically when needed.
  *
  * @param stories An array of absolute story paths.
  */
-async function toImportFn(stories: string[]) {
-  const { normalizePath } = await import('vite');
+export async function toImportFn(root: string, stories: string[]) {
   const objectEntries = stories.map((file) => {
-    const relativePath = normalizePath(relative(process.cwd(), file));
+    const relativePath = relative(root, file);
 
-    return `  '${toImportPath(relativePath)}': async () => import('/@fs/${file}')`;
+    return [toImportPath(relativePath), genDynamicImport(normalize(file))] as [string, string];
   });
 
-  return `
-    const importers = {
-      ${objectEntries.join(',\n')}
-    };
+  return dedent`
+    const importers = ${genObjectFromRawEntries(objectEntries)};
 
     export async function importFn(path) {
-        return importers[path]();
+      return await importers[path]();
     }
   `;
 }
 
-export async function generateImportFnScriptCode(options: Options) {
+export async function generateImportFnScriptCode(options: Options): Promise<string> {
   // First we need to get an array of stories and their absolute paths.
   const stories = await listStories(options);
 
   // We can then call toImportFn to create a function that can be used to load each story dynamically.
-  return (await toImportFn(stories)).trim();
+  // eslint-disable-next-line @typescript-eslint/return-await
+  return await toImportFn(options.projectRoot || process.cwd(), stories);
 }

code/builders/builder-vite/src/vite-config.ts

@@ -53,18 +53,18 @@ export async function commonConfig(
 
   const { viteConfigPath } = await getBuilderOptions<BuilderOptions>(options);
 
-  const projectRoot = resolve(options.configDir, '..');
+  options.projectRoot = options.projectRoot || resolve(options.configDir, '..');
 
   // I destructure away the `build` property from the user's config object
   // I do this because I can contain config that breaks storybook, such as we had in a lit project.
   // If the user needs to configure the `build` they need to do so in the viteFinal function in main.js.
   const { config: { build: buildProperty = undefined, ...userConfig } = {} } =
-    (await loadConfigFromFile(configEnv, viteConfigPath, projectRoot)) ?? {};
+    (await loadConfigFromFile(configEnv, viteConfigPath, options.projectRoot)) ?? {};
 
   const sbConfig: InlineConfig = {
     configFile: false,
     cacheDir: resolvePathInStorybookCache('sb-vite', options.cacheKey),
-    root: projectRoot,
+    root: options.projectRoot,
     // Allow storybook deployed as subfolder.  See https://github.com/storybookjs/builder-vite/issues/238
     base: './',
     plugins: await pluginConfig(options),

code/core/src/types/modules/core-common.ts

@@ -194,6 +194,7 @@ export interface BuilderOptions {
   ignorePreview?: boolean;
   cache?: FileSystemCache;
   configDir: string;
+  projectRoot?: string;
   docsMode?: boolean;
   features?: StorybookConfigRaw['features'];
   versionCheck?: VersionCheck;

code/sandbox/nuxt-vite-default-ts/project.json

@@ -0,0 +1,21 @@
+{
+  "name": "nuxt-vite/default-ts",
+  "$schema": "../../node_modules/nx/schemas/project-schema.json",
+  "projectType": "application",
+  "implicitDependencies": [
+    "storybook",
+    "core",
+    "addon-essentials",
+    "addon-interactions",
+    "addon-links",
+    "addon-onboarding",
+    "blocks",
+    "vue3-vite"
+  ],
+  "targets": {
+    "sandbox": {},
+    "sb:dev": {},
+    "sb:build": {}
+  },
+  "tags": ["ci:normal", "ci:merged", "ci:daily"]
+}

code/yarn.lock

@@ -6172,7 +6172,9 @@ __metadata:
     es-module-lexer: "npm:^1.5.0"
     find-cache-dir: "npm:^3.0.0"
     glob: "npm:^10.0.0"
+    knitwork: "npm:^1.1.0"
     magic-string: "npm:^0.30.0"
+    pathe: "npm:^1.1.2"
     polka: "npm:^1.0.0-next.28"
     sirv: "npm:^2.0.4"
     slash: "npm:^5.0.0"
@@ -19330,6 +19332,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"knitwork@npm:^1.1.0":
+  version: 1.1.0
+  resolution: "knitwork@npm:1.1.0"
+  checksum: 10c0/e23c679d4ded01890ab2669ccde2e85e4d7e6ba327b1395ff657f8067c7d73dc134fc8cd8188c653de4a687be7fa9c130bd36c3e2f76d8685e8b97ff8b30779c
+  languageName: node
+  linkType: hard
+
 "language-subtag-registry@npm:^0.3.20":
   version: 0.3.22
   resolution: "language-subtag-registry@npm:0.3.22"