feat: calculate semanticCommitType priority (#32069)

Co-authored-by: Rhys Arkins <rhys@arkins.net>

lib/workers/repository/updates/generate.spec.ts

@@ -703,6 +703,54 @@ describe('workers/repository/updates/generate', () => {
       );
     });
 
+    it('calculates the highest priority semanticCommitType', () => {
+      const branch = [
+        {
+          ...requiredDefaultOptions,
+          manager: 'some-manager',
+          depName: 'some-dep',
+          semanticCommits: 'enabled',
+          semanticCommitType: 'chore',
+          semanticCommitScope: 'package',
+          newValue: '1.2.0',
+          isSingleVersion: true,
+          newVersion: '1.2.0',
+          branchName: 'some-branch',
+        },
+        {
+          ...requiredDefaultOptions,
+          manager: 'some-manager',
+          depName: 'some-dep',
+          semanticCommits: 'enabled',
+          semanticCommitType: 'feat',
+          semanticCommitScope: 'package',
+          newValue: '1.2.0',
+          isSingleVersion: true,
+          newVersion: '1.2.0',
+          branchName: 'some-branch',
+        },
+        {
+          ...requiredDefaultOptions,
+          manager: 'some-manager',
+          depName: 'some-dep',
+          semanticCommits: 'enabled',
+          semanticCommitType: 'fix',
+          semanticCommitScope: 'package',
+          newValue: '1.2.0',
+          isSingleVersion: true,
+          newVersion: '1.2.0',
+          branchName: 'some-branch',
+        },
+      ] satisfies BranchUpgradeConfig[];
+      const res = generateBranchConfig(branch);
+      expect(res.prTitle).toBe(
+        'feat(package): update dependency some-dep to v1.2.0',
+      );
+      expect(res.commitMessage).toBe(
+        'feat(package): update dependency some-dep to v1.2.0',
+      );
+    });
+
     it('scopes monorepo commits', () => {
       const branch = [
         {

lib/workers/repository/updates/generate.ts

@@ -159,6 +159,9 @@ function compilePrTitle(
   logger.trace(`prTitle: ` + JSON.stringify(upgrade.prTitle));
 }
 
+// Sorted by priority, from low to high
+const semanticCommitTypeByPriority = ['chore', 'ci', 'build', 'fix', 'feat'];
+
 export function generateBranchConfig(
   upgrades: BranchUpgradeConfig[],
 ): BranchConfig {
@@ -355,6 +358,30 @@ export function generateBranchConfig(
     releaseTimestamp: releaseTimestamp!,
   }; // TODO: fixme (#9666)
 
+  // Enable `semanticCommits` if one of the branches has it enabled
+  if (
+    config.upgrades.some((upgrade) => upgrade.semanticCommits === 'enabled')
+  ) {
+    config.semanticCommits = 'enabled';
+    // Calculate the highest priority `semanticCommitType`
+    let highestIndex = -1;
+    for (const upgrade of config.upgrades) {
+      if (upgrade.semanticCommits === 'enabled' && upgrade.semanticCommitType) {
+        const priorityIndex = semanticCommitTypeByPriority.indexOf(
+          upgrade.semanticCommitType,
+        );
+
+        if (priorityIndex > highestIndex) {
+          highestIndex = priorityIndex;
+        }
+      }
+    }
+
+    if (highestIndex > -1) {
+      config.semanticCommitType = semanticCommitTypeByPriority[highestIndex];
+    }
+  }
+
   // Use templates to generate strings
   const commitMessage = compileCommitMessage(config);
   compilePrTitle(config, commitMessage);