feat(ng-dev): add support for ensuring merge-mode is set to release before publishing a new release

Author: josephperrott

ng-dev/release/publish/index.ts

@@ -8,6 +8,7 @@
 
 import {GithubConfig} from '../../utils/config.js';
 import {AuthenticatedGitClient} from '../../utils/git/authenticated-git-client.js';
+import {getCurrentMergeMode} from '../../utils/git/repository-merge-mode.js';
 import {ReleaseConfig} from '../config/index.js';
 import {ActiveReleaseTrains} from '../versioning/active-release-trains.js';
 import {NpmCommand} from '../versioning/npm-command.js';
@@ -50,6 +51,7 @@ export class ReleaseTool {
     const nextBranchName = getNextBranchName(this._github);
 
     if (
+      !(await this._verifyInReleaseMergeMode()) ||
       !(await this._verifyNoUncommittedChanges()) ||
       !(await this._verifyRunningFromNextBranch(nextBranchName)) ||
       !(await this._verifyNoShallowRepository()) ||
@@ -144,6 +146,21 @@ export class ReleaseTool {
     return true;
   }
 
+  /**
+   * Verifies that there are no uncommitted changes in the project.
+   * @returns a boolean indicating success or failure.
+   */
+  private async _verifyInReleaseMergeMode(): Promise<boolean> {
+    const mode = await getCurrentMergeMode();
+    if (mode !== 'release') {
+      Log.error(`  ✘   The repository merge-mode is set to ${mode} but must be set to release`);
+      Log.error('      prior to publishing releases. You can set merge-mode for release using:');
+      Log.error('      ng-dev caretaker merge-mode release');
+      return false;
+    }
+    return true;
+  }
+
   /**
    * Verifies that the local repository is not configured as shallow.
    * @returns a boolean indicating success or failure.