chore: setup release-please

.github/workflows/release-please.yml

@@ -13,6 +13,6 @@ jobs:
   release-please:
     runs-on: ubuntu-latest
     steps:
-      - uses: google-github-actions/release-please-action@v4
+      - uses: googleapis/release-please-action@v4
         with:
           token: ${{ secrets.GITHUB_TOKEN }}

.release-please-manifest.json

@@ -0,0 +1,4 @@
+{
+  "packages/a": "0.1.0",
+  "packages/b": "0.1.0"
+}

README.md

@@ -1,8 +1,60 @@
-# monorepo-changelog-example
+# Monorepo Changelog Example
 
-a example that use release-please to auto generate independent changelog in JavaScript mono repo.
+An example that utilizes release-please to automatically generate independent changelogs in a JavaScript monorepo.
 
-## reference
+## How to Use Release-please
+
+### Prepare Release-please Configuration and Manifest
+
+Add `release-please-config.json` in the root directory:
+
+```javascript
+{
+  "packages": {
+    // Specify the path for every package in the "packages" field.
+    "packages/a": {
+      // The "component" field specifies the tag name by release-please.
+      // If not set, release-please will use the package name and remove @scope prefix to tag.
+      "component": "b"
+    },
+    "packages/b": {
+      "component": "a"
+    }
+  },
+  // It specifies where to update the version. In Node.js, it will update the "package.json" version field.
+  "release-type": "node",
+  // To support monorepo, we need to specify the workspace plugin.
+  "plugins": ["node-workspace"],
+  // Schema for autocompletion, not used in release-please.
+  "$schema": "https://raw.githubusercontent.com/googleapis/release-please/main/schemas/config.json"
+}
+```
+
+Add `.release-please-manifest.json` manually; do not use the release-please bootstrap command because it may throw errors for monorepos:
+
+```javascript
+{
+  // Path to the package, release-please will update the version in this field and also in "package.json".
+  "packages/a": "0.1.0",
+  "packages/b": "0.1.0"
+}
+```
+
+### Action Permissions
+Release-please requires the following permissions:
+
+```yaml
+  contents: write
+  pull-requests: write
+```
+
+After adding these permissions, you also need to set action permission settings in repo/org settings: `Repo/Org settings -- Actions -- General`
+
+![Repo/Org settings -- Actions -- General](./action.png)
+
+> If you use GITHUB_TOKEN for release-please-action, be aware that it cannot trigger other actions. If you want to trigger other actions, you need to create an organization PAT or user PAT. Refer to [Github Credential](https://github.com/google-github-actions/release-please-action?tab=readme-ov-file#github-credentials) for more details.
+
+## Reference
 
 - [release-please](https://github.com/googleapis/release-please)
 - [release-please-action](https://github.com/google-github-actions/release-please-action)

packages/a/index.js

@@ -1 +1 @@
-export {}
+export const a = 'a';

packages/b/index.js

@@ -1 +1 @@
-export {}
+export const b = 'b';

release-please-config.json

@@ -0,0 +1,18 @@
+{
+  "packages": {
+    "packages/a": {
+      "component": "a"
+    },
+    "packages/b": {
+      "component": "b"
+    }
+  },
+  "bump-minor-pre-major": true,
+  "bump-patch-for-minor-pre-major": true,
+  "release-type": "node",
+  "plugins": [{
+    "type": "node-workspace",
+    "updatePeerDependencies": true
+  }],
+  "$schema": "https://raw.githubusercontent.com/googleapis/release-please/main/schemas/config.json"
+}