Add option to write only changelog md or json

change/beachball-526ee2eb-1931-449a-b24e-cc00cf631525.json

@@ -0,0 +1,7 @@
+{
+  "comment": "Add `'md'` and `'json'` options for `generateChangelog`",
+  "type": "minor",
+  "packageName": "beachball",
+  "email": "[email protected]",
+  "dependentChangeType": "patch"
+}

src/__e2e__/bump.test.ts

@@ -602,7 +602,7 @@ describe('version bumping', () => {
     expect(modified).toContain('package2');
 
     const changelogJson = readChangelogJson(repo.pathTo('packages/package2'));
-    expect(changelogJson.entries[0].comments.patch![0].comment).toBe('Bump package1 to v0.0.2');
+    expect(changelogJson?.entries[0].comments.patch![0].comment).toBe('Bump package1 to v0.0.2');
   });
 
   it('calls sync prebump hook before packages are bumped', async () => {

src/__fixtures__/changelog.ts

@@ -4,16 +4,28 @@ import _ from 'lodash';
 import { SortedChangeTypes } from '../changefile/changeTypes';
 import { ChangelogJson } from '../types/ChangeLog';
 
-/** Read the CHANGELOG.md under the given package path, sanitizing any dates for snapshots */
-export function readChangelogMd(packagePath: string): string {
+/**
+ * Read the CHANGELOG.md under the given package path, sanitizing any dates for snapshots.
+ * Returns null if it doesn't exist.
+ */
+export function readChangelogMd(packagePath: string): string | null {
   const changelogFile = path.join(packagePath, 'CHANGELOG.md');
+  if (!fs.existsSync(changelogFile)) {
+    return null;
+  }
   const text = fs.readFileSync(changelogFile, { encoding: 'utf-8' });
   return text.replace(/\w\w\w, \d\d \w\w\w [\d :]+?GMT/gm, '(date)');
 }
 
-/** Read the CHANGELOG.json under the given package path */
-export function readChangelogJson(packagePath: string, cleanForSnapshot: boolean = false): ChangelogJson {
+/**
+ * Read the CHANGELOG.json under the given package path.
+ * Returns null if it doesn't exist.
+ */
+export function readChangelogJson(packagePath: string, cleanForSnapshot: boolean = false): ChangelogJson | null {
   const changelogJsonFile = path.join(packagePath, 'CHANGELOG.json');
+  if (!fs.existsSync(changelogJsonFile)) {
+    return null;
+  }
   const json = fs.readJSONSync(changelogJsonFile, { encoding: 'utf-8' });
   return cleanForSnapshot ? cleanChangelogJson(json) : json;
 }
@@ -22,7 +34,10 @@ export function readChangelogJson(packagePath: string, cleanForSnapshot: boolean
  * Clean changelog json for a snapshot: replace dates and SHAs with placeholders.
  * Note: this clones the changelog object rather than modifying the original.
  */
-export function cleanChangelogJson(changelog: ChangelogJson): ChangelogJson {
+export function cleanChangelogJson(changelog: ChangelogJson | null): ChangelogJson | null {
+  if (!changelog) {
+    return null;
+  }
   changelog = _.cloneDeep(changelog);
   // for a better snapshot, make the fake commit match if the real commit did
   const fakeCommits: { [commit: string]: string } = {};

src/__functional__/changelog/writeChangelog.test.ts

@@ -8,16 +8,16 @@ import { writeChangelog } from '../../changelog/writeChangelog';
 import { getPackageInfos } from '../../monorepo/getPackageInfos';
 import { readChangeFiles } from '../../changefile/readChangeFiles';
 import { BeachballOptions } from '../../types/BeachballOptions';
-import { ChangeFileInfo } from '../../types/ChangeInfo';
+import { ChangeFileInfo, ChangeType } from '../../types/ChangeInfo';
 import type { Repository } from '../../__fixtures__/repository';
 import { getDefaultOptions } from '../../options/getDefaultOptions';
 
-function getChange(packageName: string, comment: string): ChangeFileInfo {
+function getChange(packageName: string, comment: string, type: ChangeType = 'patch'): ChangeFileInfo {
   return {
     comment,
     email: '[email protected]',
     packageName,
-    type: 'patch',
+    type,
     dependentChangeType: 'patch',
   };
 }
@@ -77,7 +77,7 @@ describe('writeChangelog', () => {
     expect(cleanChangelogJson(changelogJson)).toMatchSnapshot('changelog json');
 
     // Every entry should have a different commit hash
-    const patchComments = changelogJson.entries[0].comments.patch!;
+    const patchComments = changelogJson!.entries[0].comments.patch!;
     const commits = patchComments.map(entry => entry.commit);
     expect(new Set(commits).size).toEqual(patchComments.length);
 
@@ -111,7 +111,7 @@ describe('writeChangelog', () => {
     expect(cleanChangelogJson(changelogJson)).toMatchSnapshot('changelog json');
 
     // Every entry should have a different commit hash
-    const patchComments = changelogJson.entries[0].comments.patch!;
+    const patchComments = changelogJson!.entries[0].comments.patch!;
     const commits = patchComments.map(entry => entry.commit);
     expect(new Set(commits).size).toEqual(patchComments.length);
 
@@ -151,7 +151,7 @@ describe('writeChangelog', () => {
     expect(readChangelogJson(repo.pathTo('packages/bar'), true /*clean*/)).toMatchSnapshot('bar CHANGELOG.json');
 
     // Every entry should have a different commit hash
-    const patchComments = fooJson.entries[0].comments.patch!;
+    const patchComments = fooJson!.entries[0].comments.patch!;
     const commits = patchComments.map(entry => entry.commit);
     expect(new Set(commits).size).toEqual(patchComments.length);
 
@@ -296,4 +296,44 @@ describe('writeChangelog', () => {
     // Validate grouped changelog for foo and bar packages
     expect(readChangelogMd(repo.pathTo('packages/foo'))).toMatchSnapshot();
   });
+
+  it('writes only CHANGELOG.md if generateChangelog is "md"', async () => {
+    repo = repositoryFactory.cloneRepository();
+    const options = getOptions({ generateChangelog: 'md' });
+
+    repo.commitChange('foo');
+    generateChangeFiles([getChange('foo', 'comment 1')], options);
+
+    const packageInfos = getPackageInfos(repo.rootPath);
+    const changes = readChangeFiles(options, packageInfos);
+
+    await writeChangelog(options, changes, { foo: 'patch' }, { foo: new Set(['foo']) }, packageInfos);
+
+    // CHANGELOG.md is written
+    expect(readChangelogMd(repo.rootPath)).toContain('## 1.0.0');
+
+    // CHANGELOG.json is not written
+    expect(readChangelogJson(repo.rootPath)).toBeNull();
+  });
+
+  it('writes only CHANGELOG.json if generateChangelog is "json"', async () => {
+    repo = repositoryFactory.cloneRepository();
+    const options = getOptions({ generateChangelog: 'json' });
+
+    repo.commitChange('foo');
+    generateChangeFiles([getChange('foo', 'comment 1')], options);
+
+    const packageInfos = getPackageInfos(repo.rootPath);
+    const changes = readChangeFiles(options, packageInfos);
+
+    await writeChangelog(options, changes, { foo: 'patch' }, { foo: new Set(['foo']) }, packageInfos);
+
+    // CHANGELOG.md is not written
+    expect(readChangelogMd(repo.rootPath)).toBeNull();
+
+    // CHANGELOG.json is written
+    const changelogJson = readChangelogJson(repo.rootPath);
+    expect(changelogJson).not.toBeNull();
+    expect(changelogJson!.entries[0].comments.patch).toEqual([expect.objectContaining({ comment: 'comment 1' })]);
+  });
 });

src/changelog/writeChangelog.ts

@@ -123,25 +123,25 @@ async function writeChangelogFiles(
   let previousJson: ChangelogJson | undefined;
 
   // Update CHANGELOG.json
-  const changelogJsonFile = path.join(changelogPath, 'CHANGELOG.json');
-  try {
-    previousJson = fs.existsSync(changelogJsonFile) ? fs.readJSONSync(changelogJsonFile) : undefined;
-  } catch (e) {
-    console.warn(`${changelogJsonFile} is invalid: ${e}`);
-  }
-  try {
-    const nextJson = renderJsonChangelog(newVersionChangelog, previousJson);
-    fs.writeJSONSync(changelogJsonFile, nextJson, { spaces: 2 });
-  } catch (e) {
-    console.warn(`Problem writing to ${changelogJsonFile}: ${e}`);
+  if (options.generateChangelog === true || options.generateChangelog === 'json') {
+    const changelogJsonFile = path.join(changelogPath, 'CHANGELOG.json');
+    try {
+      previousJson = fs.existsSync(changelogJsonFile) ? fs.readJSONSync(changelogJsonFile) : undefined;
+    } catch (e) {
+      console.warn(`${changelogJsonFile} is invalid: ${e}`);
+    }
+    try {
+      const nextJson = renderJsonChangelog(newVersionChangelog, previousJson);
+      fs.writeJSONSync(changelogJsonFile, nextJson, { spaces: 2 });
+    } catch (e) {
+      console.warn(`Problem writing to ${changelogJsonFile}: ${e}`);
+    }
   }
 
-  // Update CHANGELOG.md
+  // Update CHANGELOG.md if there are changes of types besides "none"
   if (
-    newVersionChangelog.comments.major ||
-    newVersionChangelog.comments.minor ||
-    newVersionChangelog.comments.patch ||
-    newVersionChangelog.comments.prerelease
+    (options.generateChangelog === true || options.generateChangelog === 'md') &&
+    Object.entries(newVersionChangelog.comments).some(([type, comments]) => type !== 'none' && comments?.length)
   ) {
     const changelogFile = path.join(changelogPath, 'CHANGELOG.md');
     const previousContent = fs.existsSync(changelogFile) ? fs.readFileSync(changelogFile).toString() : '';

src/types/BeachballOptions.ts

@@ -109,10 +109,13 @@ export interface RepoOptions {
    */
   fetch: boolean;
   /**
-   * Whether to generate changelog files
-   * @default true
+   * Whether to generate changelog files.
+   * - `true` (default) to generate both CHANGELOG.md and CHANGELOG.json
+   * - `false` to skip changelog generation
+   * - `'md'` to generate only CHANGELOG.md
+   * - `'json'` to generate only CHANGELOG.json
    */
-  generateChangelog: boolean;
+  generateChangelog: boolean | 'md' | 'json';
   /** Options for bumping package versions together */
   groups?: VersionGroupOptions[];
   /**