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+# Developing Nominatim-UI
+
+## Background
+
+The user interface used to be included in the geocoder. Thus the
+first version avoid being a redesign and still uses some of the
+same configuration values. For simplicity it's not a single
+page application (SPA) written in a framework though it could
+be in the future if complexity grows.
+
+Uses [jQuery](https://jquery.com/) for browser DOM interaction,
+[handlebar](http://handlebarsjs.com/) templates to build pages,
+[leaflet](https://leafletjs.com/) for map interaction,
+[bootstrap](https://getbootstrap.com/) for layout styling.
+
+
+## Building the frontend
+
+* Install dependencies
+
+   ```
+   yarn install
+   ```
+
+* After you change files in `src` directory run
+
+   ```
+   yarn build
+   ```
+
+* Start a webserver on port 8000 to preview changes
+
+   ```
+   yarn start
+   ```
+
+* Run code style check
+
+   ```
+   yarn lint
+   ```
+
+## Prepare a release
+
+1. Update version number in `package.json` file
+
+2. Update `CHANGES.md` file
+
+3. Commit your changes: `git add... `, `git commit ...`, `git push ...` etc
+
+4. Tag release: `git tag THE_VERSION_NUMBER`, `git push --tags`
+
+5. Upload release
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