Introduce Changesets (#10337)

* Introduce changesets

* Add check-prerelease workflow

* Add repository check to prevent PR creation on forks

.changeset/README.md

@@ -0,0 +1,8 @@
+# Changesets
+
+Hello and welcome! This folder has been automatically generated by `@changesets/cli`, a build tool that works
+with multi-package repos, or single-package repos to help you version and publish your code. You can
+find the full documentation for it [in our repository](https://github.com/changesets/changesets)
+
+We have a quick list of common questions to get you started engaging with this project in
+[our documentation](https://github.com/changesets/changesets/blob/main/docs/common-questions.md)

.changeset/config.json

@@ -0,0 +1,14 @@
+{
+  "$schema": "https://unpkg.com/@changesets/config@2.2.0/schema.json",
+  "changelog": [
+    "@changesets/changelog-github",
+    { "repo": "apollographql/apollo-client" }
+  ],
+  "commit": false,
+  "fixed": [],
+  "linked": [],
+  "access": "public",
+  "baseBranch": "main",
+  "updateInternalDependencies": "patch",
+  "ignore": []
+}

.circleci/config.yml

@@ -29,6 +29,25 @@ jobs:
       - store_artifacts:
           path: reports/junit
 
+  # Ensure that any PR that changes packages has a changeset on it (perhaps
+  # an empty one created with `changeset --empty`).
+  # We run the Changesets job itself on all branches so that we can require
+  # it to pass, but we don't run any steps on the "Version Packages" PRs
+  # themselves.
+  Changesets:
+    docker:
+      - image: circleci/node:16.13.1
+    steps:
+      - checkout
+      - run: npm ci
+      - unless:
+          condition:
+            matches:
+              pattern: "^changeset-release/.+$"
+              value: << pipeline.git.branch >>
+          steps:
+            - run: npm run changeset-check
+
 workflows:
   version: 2
   Build and Test:

.github/workflows/check-prerelease.yml

@@ -0,0 +1,15 @@
+name: No prerelease file (pre.json) present
+
+on:
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  check_prerelease:
+    name: "Check branch does not have a prerelease file committed"
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: "Check that the file .changeset/pre.json is not present"
+        run: "! test -f .changeset/pre.json"

.github/workflows/exit-prerelease.yml

@@ -0,0 +1,59 @@
+name: Exit Prerelease Mode
+
+on:
+  workflow_dispatch:
+    inputs:
+      branch:
+        description: "Exit prerelease mode on release branch"
+        type: string
+        default: "release-"
+        required: true
+
+jobs:
+  exit_prerelease:
+    name: Changesets Exit Prerelease
+    runs-on: ubuntu-latest
+    # Allow GITHUB_TOKEN to have write permissions
+    permissions:
+      contents: write
+
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v3
+        with:
+          # Checkout release branch entered when workflow was kicked off
+          ref: ${{ github.event.inputs.branch }}
+          # Fetch entire git history so  Changesets can generate changelogs
+          # with the correct commits
+          fetch-depth: 0
+
+      - name: Setup Node.js 18.x
+        uses: actions/setup-node@v2
+        with:
+          node-version: 18.x
+
+      - name: Get latest tagged version
+        id: previoustag
+        uses: WyriHaximus/github-action-get-previous-tag@v1
+
+      - name: Remove 'v' prefix from version number (e.g. v1.0.0)
+        uses: mad9000/actions-find-and-replace-string@1
+        id: formatversion
+        with:
+          source: ${{ steps.previoustag.outputs.tag }}
+          find: "v"
+          replace: ""
+
+      - name: Write previous version to package.json
+        uses: jaywcjlove/github-action-package@v1.3.0
+        with:
+          version: ${{ steps.formatversion.outputs.value }}
+
+      - name: Remove pre.json
+        run: npx rimraf .changeset/pre.json
+
+      - uses: stefanzweifel/git-auto-commit-action@v4
+        with:
+          commit_message: Exit prerelease mode
+          # Commit these changes to the branch workflow is running against
+          branch: ${{ github.event.inputs.branch }}

.github/workflows/prerelease.yml

@@ -0,0 +1,63 @@
+name: Prerelease
+
+on:
+  push:
+    branches:
+      # Target release-x.x branches
+      - "release-*"
+
+concurrency: ${{ github.workflow }}-${{ github.ref }}
+
+jobs:
+  prerelease:
+    name: Changesets Prerelease
+    # Prevents changesets action from creating a PR on forks
+    if: github.repository == 'apollographql/apollo-client'
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v3
+        with:
+          # Fetch entire git history so  Changesets can generate changelogs
+          # with the correct commits
+          fetch-depth: 0
+
+      - name: Append NPM token to .npmrc
+        run: |
+          cat << EOF > "$HOME/.npmrc"
+            //registry.npmjs.org/:_authToken=$NPM_TOKEN
+          EOF
+        env:
+          NPM_TOKEN: ${{ secrets.NPM_TOKEN }}
+
+      - name: Setup Node.js 18.x
+        uses: actions/setup-node@v2
+        with:
+          node-version: 18.x
+
+      - name: Install dependencies with cache
+        uses: bahmutov/npm-install@v1
+
+      - name: Enter prerelease mode
+        # if .changeset/pre.json does not exist and we did not recently exit
+        # prerelease mode, enter prerelease mode with tag alpha
+        run: |
+          [ ! -f .changeset/pre.json && !contains(github.event.head_commit.message, 'Exit prerelease') ] \
+            && npx changeset pre enter alpha \
+            || echo 'Already in pre mode or recently exited'
+
+      - name: Create release PR
+        id: changesets
+        uses: changesets/action@v1
+        with:
+          version: npm run changeset-version
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Publish alpha to npm
+        if: "! test -f .changeset/pre.json"
+        run: npm run changeset-publish
+
+      # - name: Send a Slack notification on Publish
+      #   if: steps.changesets.outputs.published == 'true'
+      #   run: echo "Send message to Slack"

.github/workflows/release.yml

@@ -0,0 +1,50 @@
+name: Release
+
+on:
+  push:
+    branches:
+      - main
+
+concurrency: ${{ github.workflow }}-${{ github.ref }}
+
+jobs:
+  release:
+    name: Changesets Release
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v3
+        with:
+          # Fetch entire git history so  Changesets can generate changelogs
+          # with the correct commits
+          fetch-depth: 0
+
+      - name: Append NPM token to .npmrc
+        run: |
+          cat << EOF > "$HOME/.npmrc"
+            //registry.npmjs.org/:_authToken=$NPM_TOKEN
+          EOF
+        env:
+          NPM_TOKEN: ${{ secrets.NPM_TOKEN }}
+
+      - name: Setup Node.js 18.x
+        uses: actions/setup-node@v2
+        with:
+          node-version: 18.x
+
+      - name: Install dependencies (with cache)
+        uses: bahmutov/npm-install@v1
+
+      - name: Create release PR or publish to npm + GitHub
+        id: changesets
+        uses: changesets/action@v1
+        with:
+          version: npm run changeset-version
+          publish: npm run changeset-publish
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          NPM_TOKEN: ${{ secrets.NPM_TOKEN }}
+
+      # - name: Send a Slack notification on Publish
+      #   if: steps.changesets.outputs.published == 'true'
+      #   run: echo "Send message to Slack"

CONTRIBUTING.md

@@ -12,6 +12,7 @@ Here are some ways to contribute to the project, from easiest to most difficult:
   - [Reporting bugs](#reporting-bugs)
   - [Improving the documentation](#improving-the-documentation)
   - [Responding to issues](#responding-to-issues)
+  - [Changesets](#changesets)
   - [Small bug fixes](#small-bug-fixes)
   - [Suggesting features](#suggesting-features)
 - [Big PRs](#big-prs)
@@ -43,6 +44,12 @@ Improving the documentation, examples, and other open source content can be the
 
 In addition to reporting issues, a great way to contribute to Apollo is to respond to other peoples' issues and try to identify the problem or help them work around it. If you’re interested in taking a more active role in this process, please go ahead and respond to issues. And don't forget to say "Hi" in our [community forums](https://community.apollographql.com)!
 
+### Changesets
+
+Apollo Client uses [changesets](https://github.com/changesets/changesets) to automate its versioning and release process. When contributing to Apollo Client, your PR should contain a "changeset" that can be generated by running `npx changeset` from your branch locally.
+
+The changeset CLI will ask you to enter the corresponding [semver bump type](https://semver.org/) and a description of your changes: feel free to enter a brief description via the command line and continue editing the generated Markdown file found inside of `.changeset` in your editor of choice. When editing your changeset's Markdown file, you can leverage any of the features of GitHub flavored markdown! The description you provide in your changeset will be used to generate an entry in `CHANGELOG.md` and the release notes in a future release, so the more complete and descriptive the better.
+
 ### Small bug fixes
 
 For a small bug fix change (less than 20 lines of code changed), feel free to open a pull request. We’ll try to merge it as fast as possible and ideally publish a new release on the same day. The only requirement is, make sure you also add a test that verifies the bug you are trying to fix.