feat: calculate semanticCommitType priority

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 +159,14 @@ function compilePrTitle(
   logger.trace(`prTitle: ` + JSON.stringify(upgrade.prTitle));
 }
 
+const semanticCommitTypePriorities: Record<string, number> = {
+  feat: 2,
+  fix: 1,
+  build: 0,
+  ci: 0,
+  chore: 0,
+};
+
 export function generateBranchConfig(
   upgrades: BranchUpgradeConfig[],
 ): BranchConfig {
@@ -355,6 +363,27 @@ export function generateBranchConfig(
     releaseTimestamp: releaseTimestamp!,
   }; // TODO: fixme (#9666)
 
+  let highestPrioritySemanticCommitType = '';
+
+  for (const upgrade of config.upgrades) {
+    if (
+      upgrade.semanticCommitType &&
+      upgrade.semanticCommitType in semanticCommitTypePriorities
+    ) {
+      const priority = semanticCommitTypePriorities[upgrade.semanticCommitType];
+      const highestPriority =
+        semanticCommitTypePriorities[highestPrioritySemanticCommitType] ?? -1;
+
+      if (priority > highestPriority) {
+        highestPrioritySemanticCommitType = upgrade.semanticCommitType;
+      }
+    }
+  }
+
+  if (highestPrioritySemanticCommitType) {
+    config.semanticCommitType = highestPrioritySemanticCommitType;
+  }
+
   // Use templates to generate strings
   const commitMessage = compileCommitMessage(config);
   compilePrTitle(config, commitMessage);