feat(ng-dev/release): Allow retrieving the number of commits in the r…

…elease notes (#180)

PR Close #180

ng-dev/release/notes/release-notes.ts

@@ -50,6 +50,12 @@ export class ReleaseNotes {
     return render(changelogTemplate, await this.generateRenderContext(), {rmWhitespace: true});
   }
 
+  /** Retrieve the number of commits included in the release notes after filtering and deduping. */
+  async getCommitCountInReleaseNotes() {
+    const context = await this.generateRenderContext();
+    return context.commits.filter(context.includeInReleaseNotes()).length;
+  }
+
   /**
    * Gets the URL fragment for the release notes. The URL fragment identifier
    * can be used to point to a specific changelog entry through an URL.

ng-dev/release/publish/test/release-notes/generation.spec.ts

@@ -423,4 +423,18 @@ describe('release notes generation', () => {
       `);
     });
   });
+
+  it('should determine the number of commits included in the entry', async () => {
+    SandboxGitRepo.withInitialCommit(githubConfig)
+      .createTagForHead('0.0.0')
+      .commit('fix: first thing fixed')
+      .commit('feat: first new thing')
+      .commit('feat: second new thing')
+      .commit('build: rework everything')
+      .commit('fix: fix what we broke');
+
+    const releaseNotes = await ReleaseNotes.forRange(parse('0.0.1'), '0.0.0', 'HEAD');
+
+    expect(await releaseNotes.getCommitCountInReleaseNotes()).toBe(4);
+  });
 });