fix(storybook-builder): fix paths on Windows

Author: bashmish

packages/storybook-builder/src/esbuild-plugin-commonjs-named-exports.ts

@@ -1,11 +1,13 @@
 import type { Plugin } from 'esbuild';
 import { readFile } from 'fs-extra';
-import { dirname } from 'path';
+import { dirname, relative } from 'path';
 
 export function esbuildPluginCommonjsNamedExports(modules: string[]): Plugin {
   return {
     name: 'commonjs-named-exports',
     async setup(build) {
+      const slash = (await import('slash')).default;
+
       const { init, parse } = await import('cjs-module-lexer');
       await init();
 
@@ -56,7 +58,9 @@ export function esbuildPluginCommonjsNamedExports(modules: string[]): Plugin {
 
         return {
           resolveDir,
-          contents: `export { ${finalExports.join(',')} } from '${resolvedPath}';`,
+          contents: `export { ${finalExports.join(',')} } from '${slash(
+            relative(resolveDir, resolvedPath),
+          )}';`,
         };
       });
 

packages/storybook-builder/src/rollup-plugin-mdx.ts

@@ -1,7 +1,7 @@
 import { compile } from '@storybook/mdx2-csf';
 import type { Options } from '@storybook/types';
 import { exists, readFile } from 'fs-extra';
-import { isAbsolute } from 'path';
+import { isAbsolute, normalize } from 'path';
 import remarkExternalLinks from 'remark-external-links';
 import remarkSlug from 'remark-slug';
 import type { Plugin } from 'rollup';
@@ -30,7 +30,7 @@ export function rollupPluginMdx(storybookOptions: Options): Plugin {
       if (!id.endsWith('.mdx.js')) return;
 
       const mdxPath = id.replace(/\.js$/, '');
-      const mdxCode = await readFile(mdxPath, 'utf8');
+      const mdxCode = await readFile(normalize(mdxPath), 'utf8');
 
       const mdxLoaderOptions = await storybookOptions.presets.apply('mdxLoaderOptions', {
         ...mdxPluginOptions,

packages/storybook-builder/src/rollup-plugin-prebundle-modules.ts

@@ -1,12 +1,12 @@
 import { stringifyProcessEnvs } from '@storybook/core-common';
 import { build } from 'esbuild';
 import { remove } from 'fs-extra';
-import { join } from 'path';
+import { join, normalize } from 'path';
 import type { Plugin } from 'rollup';
 import { esbuildPluginCommonjsNamedExports } from './esbuild-plugin-commonjs-named-exports.js';
 import { getNodeModuleDir } from './get-node-module-dir.js';
 
-export const PREBUNDLED_MODULES_DIR = 'node_modules/.prebundled_modules';
+export const PREBUNDLED_MODULES_DIR = normalize('node_modules/.prebundled_modules');
 
 export function rollupPluginPrebundleModules(env: Record<string, string>): Plugin {
   const modulePaths: Record<string, string> = {};