Add comprehensive GitHub Copilot instructions for bowser repository

Co-authored-by: naorpeled <6171622+naorpeled@users.noreply.github.com>

.github/copilot-instructions.md

@@ -0,0 +1,179 @@
+# Bowser - Browser/Device/OS Detection Library
+
+Bowser is a lightweight JavaScript library for detecting browser, operating system, and device information from user-agent strings. It works in both browser and Node.js environments and provides a rich API for parsing and comparing browser capabilities.
+
+**ALWAYS follow these instructions first and fallback to additional search and context gathering only if the information here is incomplete or found to be in error.**
+
+## Working Effectively
+
+### Environment Setup
+- **CRITICAL**: Use Node.js version 12.16.3 exactly. Newer versions (16+, 20+) will fail due to webpack/babel compatibility issues.
+- Install nvm to manage Node.js versions if needed:
+  ```bash
+  curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.40.0/install.sh | bash
+  export NVM_DIR="$HOME/.nvm"
+  [ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh"
+  nvm install 12.16.3
+  nvm use 12.16.3
+  ```
+
+### Bootstrap and Build
+Follow these steps exactly in order:
+1. **Install dependencies**: `npm ci` -- takes 6-7 seconds. Use npm ci instead of npm install for consistency.
+2. **Build the library**: `npm run build` -- takes 4-5 seconds. NEVER CANCEL. Set timeout to 30+ seconds.
+3. **Run tests**: `npm test` -- takes 8 seconds. NEVER CANCEL. Set timeout to 60+ seconds.
+4. **Run linting**: `npm run lint:check` -- takes 1-2 seconds.
+
+### Build Troubleshooting
+- **If build fails with "digital envelope routines::unsupported"**: You are using the wrong Node.js version. Switch to 12.16.3.
+- **If build fails with "@babel/helper-compilation-targets" errors**: You are using the wrong Node.js version. Switch to 12.16.3.
+- **npm install shows many deprecation warnings**: This is expected with the legacy dependencies, ignore these warnings.
+- **Build shows webpack/babel warnings about core-js and caniuse-lite**: These are expected warnings, the build still succeeds correctly.
+- **"WARNING: We noticed you're using the `useBuiltIns` option without declaring a core-js version"**: This is expected, ignore this warning.
+
+## Validation
+
+### Manual Testing Requirements
+After making any changes, ALWAYS validate functionality:
+1. **Test the built library**: Create a test script to verify bowser functionality works correctly
+2. **Basic parsing test** (create test script in project root):
+   ```javascript
+   const bowser = require('./es5.js');
+   const testUA = 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36';
+   const browser = bowser.getParser(testUA);
+   console.log('Browser:', browser.getBrowserName());
+   console.log('OS:', browser.getOSName());
+   console.log('Platform:', browser.getPlatformType());
+   ```
+3. **Verify build outputs**: Check that both `es5.js` and `bundled.js` are generated and have reasonable file sizes (~26KB and ~114KB respectively)
+
+### End-to-End Scenarios
+Test these complete workflows after making changes:
+- **Parse a modern browser UA**: Verify Chrome, Firefox, Safari detection works correctly
+- **Parse mobile browser UA**: Test mobile Chrome, Safari iOS detection
+- **Test satisfies() method**: Verify version comparison logic with common version patterns
+- **Test alias resolution**: Verify browser aliases work (e.g., 'chrome' instead of 'Chrome')
+
+### Pre-commit Validation
+ALWAYS run these before committing changes or the CI will fail:
+- `npm run lint:check` - ESLint validation (1-2 seconds)
+- `npm run build` - Verify builds successfully (4-5 seconds)
+- `npm test` - Full test suite (8 seconds, 257 tests)
+
+## Development Workflow
+
+### Common Tasks
+- **Add new browser support**: Update `src/parser-browsers.js` and add test cases to `test/acceptance/useragentstrings.yml`
+- **Update browser aliases**: Modify `src/constants.js` following naming conventions (lowercase, underscores, no 'browser' suffix)
+- **Fix parsing logic**: Main parsing logic is in `src/parser.js`
+- **Update documentation**: Run `npm run generate-docs` to rebuild JSDoc documentation (takes <1 second)
+
+### Testing Strategy
+- **Unit tests**: Located in `test/unit/` - test individual functions and methods
+- **Acceptance tests**: Located in `test/acceptance/` - test against real user-agent strings from `useragentstrings.yml`
+- **Test data**: The `useragentstrings.yml` file contains 200+ real user-agent strings with expected parsing results
+
+### Code Organization
+```
+src/
+├── bowser.js          # Main entry point and public API
+├── parser.js          # Core parsing logic and Parser class
+├── parser-browsers.js # Browser detection patterns
+├── parser-engines.js  # Engine detection patterns  
+├── parser-os.js       # Operating system detection
+├── parser-platforms.js# Platform/device type detection
+├── constants.js       # Browser aliases and constants
+└── utils.js           # Utility functions
+
+test/
+├── unit/              # Unit tests for individual modules
+└── acceptance/        # End-to-end tests with real user agents
+```
+
+## Build and Distribution
+
+### Output Files
+- `es5.js` - Main transpiled version (~26KB) - referenced by package.json "main" field
+- `bundled.js` - Version with babel polyfill included (~114KB) - for environments without polyfills
+- Both files are UMD modules compatible with CommonJS, AMD, and browser globals
+
+### Webpack Configuration
+- Uses webpack 4.41.0 with babel-loader for transpilation
+- Targets ES5 for maximum compatibility
+- Includes compression plugin for .gz versions
+- Configuration in `webpack.config.js`
+
+## Timing Expectations
+
+**NEVER CANCEL these commands - wait for completion:**
+- `npm ci`: 6-7 seconds 
+- `npm run build`: 4-5 seconds - NEVER CANCEL, set timeout to 30+ seconds
+- `npm test`: 8 seconds - NEVER CANCEL, set timeout to 60+ seconds  
+- `npm run lint:check`: 1-2 seconds
+- `npm run generate-docs`: <1 second
+
+## CI/CD Integration
+
+The project uses GitHub Actions (.github/workflows/):
+- **pull-request.yml**: Runs on every PR, tests with Node.js 12.16.3
+- **merge-to-master.yml**: Handles merges to master branch
+- **publish.yml**: Handles npm publishing
+- Uses `npm ci`, `npm run build`, `npm test`, and `npm run lint:check`
+
+## Library Usage Patterns
+
+### Common API Usage
+```javascript
+// Get parser instance
+const browser = Bowser.getParser(userAgentString);
+
+// Get browser info
+browser.getBrowserName();     // "Chrome"
+browser.getBrowserVersion();  // "91.0.4472.114"
+
+// Get OS info  
+browser.getOSName();         // "macOS"
+browser.getOSVersion();      // "10.15.7"
+
+// Get platform info
+browser.getPlatformType();   // "desktop"
+
+// Parse everything at once
+Bowser.parse(userAgentString);
+
+// Version comparison
+browser.satisfies({
+  chrome: ">=70",
+  firefox: ">60"
+});
+```
+
+### Browser Aliases
+Defined in `src/constants.js`. Follow these rules when adding:
+- Use lowercase letters only
+- Replace spaces/dashes with underscores  
+- Drop "browser" from names when possible
+- Examples: "UC Browser" → "uc", "Opera Coast" → "opera_coast"
+
+## Troubleshooting
+
+### Common Issues
+- **Build fails**: Wrong Node.js version - use 12.16.3 exactly
+- **Tests fail**: Usually indicates real bugs - don't ignore failing tests
+- **Lint errors**: Run `npm run lint:fix` to auto-fix style issues
+- **New browser not detected**: Add patterns to `parser-browsers.js` and test cases to `useragentstrings.yml`
+
+### Debug Workflow
+1. Add console.log() statements in parsing logic
+2. Run single test: `npx ava test/unit/parser.js -m "*specific test*"`
+3. Test with custom user agent: Create temporary test script
+4. Check test data: Verify `useragentstrings.yml` has correct expected results
+
+## Documentation
+
+- **API docs**: Generated with JSDoc, run `npm run generate-docs`
+- **Main docs**: `README.md` with usage examples
+- **Contributing**: `.github/CONTRIBUTING.md` with development guidelines
+- **Online demo**: https://bowser-js.github.io/bowser-online/
+
+Always update documentation when making API changes or adding new features.

docs/Bowser.html

@@ -492,7 +492,7 @@ explicitly. Same as <code>skipParsing</code> for <a href="Parser.html">Parser</a
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 <footer>
-    Documentation generated by <a href="https://github.com/jsdoc3/jsdoc">JSDoc 3.6.3</a> on Sat Aug 09 2025 17:54:44 GMT+0000 (Coordinated Universal Time) using the <a href="https://github.com/clenemt/docdash">docdash</a> theme.
+    Documentation generated by <a href="https://github.com/jsdoc3/jsdoc">JSDoc 3.6.3</a> on Sat Aug 09 2025 17:59:04 GMT+0000 (Coordinated Universal Time) using the <a href="https://github.com/clenemt/docdash">docdash</a> theme.
 </footer>
 
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docs/Parser.html

@@ -3596,7 +3596,7 @@ Returns <code>undefined</code> when the browser is no described in the checkTree
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 <footer>
-    Documentation generated by <a href="https://github.com/jsdoc3/jsdoc">JSDoc 3.6.3</a> on Sat Aug 09 2025 17:54:44 GMT+0000 (Coordinated Universal Time) using the <a href="https://github.com/clenemt/docdash">docdash</a> theme.
+    Documentation generated by <a href="https://github.com/jsdoc3/jsdoc">JSDoc 3.6.3</a> on Sat Aug 09 2025 17:59:04 GMT+0000 (Coordinated Universal Time) using the <a href="https://github.com/clenemt/docdash">docdash</a> theme.
 </footer>
 
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docs/bowser.js.html

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 <footer>
-    Documentation generated by <a href="https://github.com/jsdoc3/jsdoc">JSDoc 3.6.3</a> on Sat Aug 09 2025 17:54:44 GMT+0000 (Coordinated Universal Time) using the <a href="https://github.com/clenemt/docdash">docdash</a> theme.
+    Documentation generated by <a href="https://github.com/jsdoc3/jsdoc">JSDoc 3.6.3</a> on Sat Aug 09 2025 17:59:04 GMT+0000 (Coordinated Universal Time) using the <a href="https://github.com/clenemt/docdash">docdash</a> theme.
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docs/global.html

@@ -2706,7 +2706,7 @@ like <code>&quot;iPhone&quot;</code> or <code>&quot;Kindle Fire HD 7&quot;</code
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 <footer>
-    Documentation generated by <a href="https://github.com/jsdoc3/jsdoc">JSDoc 3.6.3</a> on Sat Aug 09 2025 17:54:44 GMT+0000 (Coordinated Universal Time) using the <a href="https://github.com/clenemt/docdash">docdash</a> theme.
+    Documentation generated by <a href="https://github.com/jsdoc3/jsdoc">JSDoc 3.6.3</a> on Sat Aug 09 2025 17:59:04 GMT+0000 (Coordinated Universal Time) using the <a href="https://github.com/clenemt/docdash">docdash</a> theme.
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docs/index.html

@@ -208,7 +208,7 @@ list of aliases can be found in <a href="src/constants.js">the file</a>.</p>
 <br class="clear">
 
 <footer>
-    Documentation generated by <a href="https://github.com/jsdoc3/jsdoc">JSDoc 3.6.3</a> on Sat Aug 09 2025 17:54:44 GMT+0000 (Coordinated Universal Time) using the <a href="https://github.com/clenemt/docdash">docdash</a> theme.
+    Documentation generated by <a href="https://github.com/jsdoc3/jsdoc">JSDoc 3.6.3</a> on Sat Aug 09 2025 17:59:04 GMT+0000 (Coordinated Universal Time) using the <a href="https://github.com/clenemt/docdash">docdash</a> theme.
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 <script>prettyPrint();</script>

docs/parser.js.html

@@ -567,7 +567,7 @@ export default Parser;
 <br class="clear">
 
 <footer>
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+    Documentation generated by <a href="https://github.com/jsdoc3/jsdoc">JSDoc 3.6.3</a> on Sat Aug 09 2025 17:59:04 GMT+0000 (Coordinated Universal Time) using the <a href="https://github.com/clenemt/docdash">docdash</a> theme.
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docs/utils.js.html

@@ -365,7 +365,7 @@ export default class Utils {
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+    Documentation generated by <a href="https://github.com/jsdoc3/jsdoc">JSDoc 3.6.3</a> on Sat Aug 09 2025 17:59:04 GMT+0000 (Coordinated Universal Time) using the <a href="https://github.com/clenemt/docdash">docdash</a> theme.
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