Module not found: Can't resolve '@theme/hooks/useDocs'

Bug description

An error occurred: Module not found: Can't resolve '@theme/hooks/useDocs' after running yarn build.

Reproduction

yarn add @cmfcmf/docusaurus-search-local
add plugin settings to docusaurus.config.js
yarn build

Environment

Package Versions

yarn list v1.21.1
├─ @cmfcmf/docusaurus-search-local@0.4.0
├─ @docusaurus/core@2.0.0-alpha.55
├─ @docusaurus/mdx-loader@2.0.0-alpha.55
├─ @docusaurus/plugin-content-blog@2.0.0-alpha.55
├─ @docusaurus/plugin-content-docs@2.0.0-alpha.55
├─ @docusaurus/plugin-content-pages@2.0.0-alpha.55
├─ @docusaurus/plugin-google-analytics@2.0.0-alpha.55
├─ @docusaurus/plugin-google-gtag@2.0.0-alpha.55
├─ @docusaurus/plugin-sitemap@2.0.0-alpha.55
├─ @docusaurus/preset-classic@2.0.0-alpha.55
├─ @docusaurus/theme-classic@2.0.0-alpha.55
├─ @docusaurus/theme-search-algolia@2.0.0-alpha.55
├─ @docusaurus/types@2.0.0-alpha.55
└─ @docusaurus/utils@2.0.0-alpha.55

Node Version

v12.14.0

Docusaurus Environment

Are you using a custom theme?: No
Paste the plugin config of the local search plugin from your docusaurus.config.js file
```
plugins: [
[require.resolve("@cmfcmf/docusaurus-search-local") ]],
```

Additional Information

There seems to be no file like "hooks/useDocs.js" in this repository. Is the required file external one?

cmfcmf / docusaurus-search-local

Module not found: Can't resolve '@theme/hooks/useDocs' #26