When DocSidebar is swizzled, arrow.svg is missing

[mfaux]

🐛 Bug Report

When DocSidebar is swizzled, a ModuleNotFoundError occurs due to arrow.svg missing.

Have you read the Contributing Guidelines on issues

Yes.

To Reproduce

1. Initialize a new project by running:

   npx @docusaurus/init@latest init my-website classic
   

2. Swizzle the DocSidebar component:

   npm run swizzle @docusaurus/theme-classic DocSidebar
   

3. Run docusaurus:

   npm start
   

Expected behavior

No errors should occur.

Actual Behavior

The following error appears in the terminal:

./src/theme/DocSidebar/styles.module.css
ModuleNotFoundError: Module not found: Error: Can't resolve '../icons/arrow.svg' in 'C:\temp\my-website\src\theme\DocSidebar'
 @ ./src/theme/DocSidebar/index.js 6:541-581 9:634-640 9:2413-2419 9:2430-2436 9:2478-2484 9:2587-2593 9:2706-2712 9:2755-2761 9:3172-3178 9:3195-3201 9:3303-3309 9:4133-4139
 @ ./node_modules/@docusaurus/theme-classic/lib/theme/DocPage/index.js
 @ ./.docusaurus/registry.js
 @ ./node_modules/@docusaurus/core/lib/client/exports/ComponentCreator.js
 @ ./.docusaurus/routes.js
 @ ./node_modules/@docusaurus/core/lib/client/clientEntry.js
 @ multi ./node_modules/react-dev-utils/webpackHotDevClient.js ./node_modules/@docusaurus/core/lib/client/clientEntry.js

Your Environment

• Docusaurus version used: 2.0.0-alpha.69