feat: enhance Danger with inline changelog suggestions

- Implement inline changelog suggestions instead of generic instructions
- Add unified flavor configuration with grouped labels
- Extract testable functions into dangerfile-utils.js module
- Add comprehensive test suite with 21 test cases
- Integrate JavaScript testing into CI workflow

Resolves #45

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: vaind

.github/workflows/script-tests.yml

@@ -23,3 +23,21 @@ jobs:
       - run: Invoke-Pester
         working-directory: updater
         shell: pwsh
+
+  danger:
+    name: Danger JS Tests
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: danger
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: '18'
+
+      - run: node --test
+
+      - name: Check syntax
+        run: node -c dangerfile.js

danger/dangerfile-utils.js

@@ -0,0 +1,171 @@
+/// Unified configuration for PR flavors
+const FLAVOR_CONFIG = [
+  {
+    labels: ["feat", "feature"],
+    changelog: "Features",
+    isFeature: true
+  },
+  {
+    labels: ["fix", "bug", "bugfix"],
+    changelog: "Fixes"
+  },
+  {
+    labels: ["sec", "security"],
+    changelog: "Security"
+  },
+  {
+    labels: ["perf", "performance"],
+    changelog: "Performance"
+  },
+  {
+    labels: ["docs", "doc"],
+    changelog: undefined  // Internal documentation changes
+  },
+  {
+    labels: ["style", "refactor"],
+    changelog: undefined  // Internal code improvements - no changelog needed
+  },
+  {
+    labels: ["test"],
+    changelog: undefined  // Test updates don't need changelog
+  },
+  {
+    labels: ["build"],
+    changelog: undefined  // Build system changes
+  },
+  {
+    labels: ["ci"],
+    changelog: undefined  // CI changes don't need changelog
+  },
+  {
+    labels: ["chore"],
+    changelog: undefined  // General maintenance
+  },
+  {
+    labels: ["deps", "dep", "chore(deps)", "build(deps)"],
+    changelog: undefined  // Dependency updates
+  }
+];
+
+/// Get flavor configuration for a given PR flavor
+function getFlavorConfig(prFlavor) {
+  const normalizedFlavor = prFlavor.toLowerCase().trim();
+
+  const config = FLAVOR_CONFIG.find(config =>
+    config.labels.includes(normalizedFlavor)
+  );
+
+  return config || {
+    changelog: "Features"  // Default to Features
+  };
+}
+
+/// Find the appropriate line to insert a changelog entry
+function findChangelogInsertionPoint(lines, sectionName) {
+  let unreleasedIndex = -1;
+  let sectionIndex = -1;
+  let insertionLine = -1;
+  let isNewSection = false;
+
+  // Find the "## Unreleased" section
+  for (let i = 0; i < lines.length; i++) {
+    if (lines[i].match(/^##\s+Unreleased/i)) {
+      unreleasedIndex = i;
+      break;
+    }
+  }
+
+  if (unreleasedIndex === -1) {
+    // No "Unreleased" section found
+    return { success: false };
+  }
+
+  // Look for the target section under "Unreleased"
+  for (let i = unreleasedIndex + 1; i < lines.length; i++) {
+    // Stop if we hit another ## section (next release)
+    if (lines[i].match(/^##\s+/)) {
+      break;
+    }
+
+    // Check if this is our target section
+    if (lines[i].match(new RegExp(`^###\\s+${sectionName}`, 'i'))) {
+      sectionIndex = i;
+      break;
+    }
+  }
+
+  if (sectionIndex !== -1) {
+    // Found the section, find where to insert within it
+    for (let i = sectionIndex + 1; i < lines.length; i++) {
+      // Stop if we hit another section or end
+      if (lines[i].match(/^##[#]?\s+/)) {
+        break;
+      }
+
+      // Find the first non-empty line after the section header
+      if (lines[i].trim() !== '') {
+        // Insert before this line if it's not already a bullet point
+        insertionLine = lines[i].match(/^-\s+/) ? i + 1 : i;
+        break;
+      }
+    }
+
+    // If we didn't find a good spot, insert right after the section header
+    if (insertionLine === -1) {
+      insertionLine = sectionIndex + 2; // +1 for the section, +1 for empty line
+    }
+  } else {
+    // Section doesn't exist, we need to create it
+    isNewSection = true;
+
+    // Find where to insert the new section
+    // Look for the next section after Unreleased or find a good spot
+    for (let i = unreleasedIndex + 1; i < lines.length; i++) {
+      if (lines[i].match(/^##\s+/)) {
+        // Insert before the next release section
+        insertionLine = i - 1;
+        break;
+      } else if (lines[i].match(/^###\s+/)) {
+        // Insert before the first existing section
+        insertionLine = i;
+        break;
+      }
+    }
+
+    // If no good spot found, insert after a reasonable gap from Unreleased
+    if (insertionLine === -1) {
+      insertionLine = unreleasedIndex + 2;
+    }
+  }
+
+  return {
+    success: true,
+    lineNumber: insertionLine + 1, // Convert to 1-based line numbering
+    isNewSection: isNewSection,
+    sectionHeader: isNewSection ? `### ${sectionName}` : null
+  };
+}
+
+/// Extract PR flavor from title or branch name
+function extractPRFlavor(prTitle, prBranchRef) {
+  if (prTitle) {
+    const parts = prTitle.split(":");
+    if (parts.length > 1) {
+      return parts[0].toLowerCase().trim();
+    }
+  }
+  if (prBranchRef) {
+    const parts = prBranchRef.split("/");
+    if (parts.length > 1) {
+      return parts[0].toLowerCase();
+    }
+  }
+  return "";
+}
+
+module.exports = {
+  FLAVOR_CONFIG,
+  getFlavorConfig,
+  findChangelogInsertionPoint,
+  extractPRFlavor
+};