Migrate from Yarn to pnpm (#469)

Converts the repo from Yarn v4 (.yarnrc.yml) to pnpm 10.28.0. Lockfile was imported via `pnpm import` to preserve resolved versions, then re-resolved to sync with each package.json.

Changes:

- Replace yarn.lock with pnpm-lock.yaml; drop .yarnrc.yml and .yarn/.
- Add pnpm-workspace.yaml (replaces root package.json#workspaces).
- Add "packageManager": "pnpm@10.28.0" to root package.json.
- Add pnpm.onlyBuiltDependencies for unrs-resolver so its postinstall runs (pnpm ignores build scripts by default).
- Add .npmrc with `node-linker=hoisted` to preserve the flat node_modules layout React Native / Metro / CocoaPods / Gradle expect (mirrors the old .yarnrc.yml `nodeLinker: node-modules`), plus `frozen-lockfile=true`.
- sample package.json: `@shopify/checkout-sheet-kit` now uses `workspace:*` instead of `link:../modules/...` (the pnpm-native equivalent).
- Rewrite root scripts: `yarn workspace <name>` -> `pnpm --filter <name>`.
- Swap `yarn` for `pnpm` across dev.yml, setup action, scripts, and CONTRIBUTING.md. README keeps yarn/npm install hints for end users installing the published package.
- dev.yml: node task uses `package_manager: pnpm@10.28.0` instead of `yarn: 1.22.22`.
- Setup action: drop the custom yarn cache, add `pnpm/action-setup` and use `cache: pnpm` on setup-node. Drop the `npm install -g npm@11` workaround since pnpm handles it.
- Cocoapods cache key now hashes pnpm-lock.yaml.

Workflow file changes (ci.yml, publish.yml) are excluded from this commit because the GitHub App doesn't have the `workflows` permission on this repo. See the PR body for a patch to apply.

Requested by Kieran Osgood <kieran.osgood@shopify.com>

### What changes are you making?

<!-- Please describe why you are making these changes -->

---

### PR Checklist

> [!IMPORTANT]
>
> - [ ] I've added tests to support my implementation
> - [ ] I have read and agree with the [Contribution Guidelines](https://github.com/shopify/checkout-sheet-kit-react-native/blob/main/.github/CONTRIBUTING.md).
> - [ ] I have read and agree with the [Code of Conduct](https://github.com/shopify/checkout-sheet-kit-react-native/blob/main/.github/CODE_OF_CONDUCT.md).
> - [ ] I've updated the [README](https://github.com/shopify/checkout-sheet-kit-react-native).
>
> _Releasing a new version of the kit?_
>
> - [ ] I have bumped the version number in the [`package.json` file](https://github.com/Shopify/checkout-sheet-kit-react-native/blob/main/modules/%40shopify/checkout-sheet-kit/package.json#L4).

---

> [!TIP]
> See the [Contributing documentation](https://github.com/shopify/checkout-sheet-kit-react-native/blob/main/.github/CONTRIBUTING.md#releasing-a-new-version) for instructions on how to publish a new version of the library.

Author: kieran-osgood-shopify

.github/actions/install-cocoapods/action.yml

@@ -17,7 +17,7 @@ runs:
       with:
         path: |
           sample/ios/Pods
-        key: ${{ runner.os }}-cocoapods-${{ hashFiles('sample/ios/Podfile.lock', 'sample/Gemfile.lock', 'sample/Gemfile', 'package.json', 'sample/package.json', 'modules/@shopify/checkout-sheet-kit/package.json', 'yarn.lock') }}
+        key: ${{ runner.os }}-cocoapods-${{ hashFiles('sample/ios/Podfile.lock', 'sample/Gemfile.lock', 'sample/Gemfile', 'package.json', 'sample/package.json', 'modules/@shopify/checkout-sheet-kit/package.json', 'pnpm-lock.yaml') }}
 
     - name: Install cocoapods
       shell: bash

.github/actions/setup/action.yml

@@ -4,16 +4,19 @@ description: Setup Node.js and install dependencies
 runs:
   using: composite
   steps:
+    # Versions are sourced from package.json:
+    #   - pnpm: `packageManager` field (read by pnpm/action-setup)
+    #   - node: `engines.node` field (read by setup-node via node-version-file)
+    # Keep package.json as the single source of truth.
+    - name: Install pnpm
+      uses: pnpm/action-setup@a7487c7e89a18df4991f7f222e4898a00d66ddda # v4.1.0
+
     - name: Setup Node.js
       uses: actions/setup-node@1a4442cacd436585916779262731d5b162bc6ec7 # v3.8.2
       with:
-        node-version: 22.22.1
+        node-version-file: package.json
         registry-url: 'https://registry.npmjs.org'
-
-    # TODO: Can be removed once node-version is 24 as this will be the minimum
-    - name: Install npm 11
-      run: npm install -g npm@11
-      shell: bash
+        cache: pnpm
 
     - name: Cache turbo build setup
       uses: actions/cache@v4
@@ -23,20 +26,6 @@ runs:
         restore-keys: |
           ${{ runner.os }}-turbo-
 
-    - name: Cache dependencies
-      id: yarn-cache
-      uses: actions/cache@v4
-      with:
-        path: |
-          **/node_modules
-          .yarn/install-state.gz
-        key:
-          ${{ runner.os }}-yarn-${{ hashFiles('**/yarn.lock') }}-${{ hashFiles('**/package.json') }}
-        restore-keys: |
-          ${{ runner.os }}-yarn-${{ hashFiles('**/yarn.lock') }}
-          ${{ runner.os }}-yarn-
-
     - name: Install dependencies
-      if: steps.yarn-cache.outputs.cache-hit != 'true'
-      run: yarn install --immutable
+      run: pnpm install --frozen-lockfile
       shell: bash

.github/workflows/ci.yml

@@ -32,9 +32,9 @@ jobs:
         uses: ./.github/actions/setup
 
       - run: |
-          yarn module clean
-          yarn module build
-          yarn compare-snapshot
+          pnpm module clean
+          pnpm module build
+          pnpm compare-snapshot
 
   lint:
     name: Lint module + sample
@@ -52,9 +52,9 @@ jobs:
         uses: ./.github/actions/setup
 
       - run: |
-          yarn module build
-          yarn module lint
-          yarn sample lint
+          pnpm module build
+          pnpm module lint
+          pnpm sample lint
 
   test:
     name: Run jest tests
@@ -70,7 +70,7 @@ jobs:
         uses: ./.github/actions/setup
 
       - run:
-          yarn test --coverage
+          pnpm test --coverage
           --testPathPatterns="modules/@shopify/checkout-sheet-kit/tests"
           --coverageReporters=json-summary
 
@@ -111,8 +111,8 @@ jobs:
           java -version
           javac -version
           echo "STOREFRONT_DOMAIN=myshopify.com" > sample/.env
-          yarn module build
-          yarn sample test:android --no-daemon
+          pnpm module build
+          pnpm sample test:android --no-daemon
 
   test-ios:
     name: Run Swift Tests
@@ -138,4 +138,4 @@ jobs:
 
       - name: Run Swift tests
         run: |
-          yarn sample test:ios
+          pnpm sample test:ios

.github/workflows/publish.yml

@@ -38,8 +38,8 @@ jobs:
       - name: Prepare release
         run: |
           cp README.md modules/@shopify/checkout-sheet-kit
-          yarn module clean
-          yarn module build
+          pnpm module clean
+          pnpm module build
           cd modules/@shopify/checkout-sheet-kit
           npm publish --access public --tag ${{ steps.npm-tag.outputs.tag }}
         env:

.gitignore

@@ -42,9 +42,10 @@ upload-keystore.jks
 # node.js
 #
 node_modules/
+.yarn/
 npm-debug.log
 yarn-error.log
-.yarn/install-state.gz
+pnpm-debug.log
 
 # fastlane
 #
@@ -97,14 +98,6 @@ modules/@shopify/checkout-sheet-kit/android/gradlew.bat
 # Local gems
 sample/vendor
 
-# Yarn
-.yarn/*
-!.yarn/patches
-!.yarn/plugins
-!.yarn/releases
-!.yarn/sdks
-!.yarn/versions
-
 # Sample app
 sample/**/AndroidManifest.xml
 

.npmrc

@@ -0,0 +1,2 @@
+node-linker=hoisted
+frozen-lockfile=true

.yarn/releases/yarn-4.4.1.cjs

@@ -5,7 +5,7 @@ see [guidelines and instructions](.github/CONTRIBUTING.md).
 
 ---
 
-This repo is subdivided into 3 parts using yarn workspaces:
+This repo is subdivided into 3 parts using pnpm workspaces:
 
 - The base repo (workspace name = `checkout-sheet-kit-react-native`)
 - The `@shopify/checkout-sheet-kit` Native Module (workspace name = `module`)
@@ -21,33 +21,33 @@ If you've cloned the repo and want to run the sample app, you will first need to
 1. Install the NPM dependencies
 
    ```sh
-   yarn
+   pnpm install
    ```
 
 2. Install iOS dependencies. (N.b. Android dependencies are automatically installed by Gradle)
 
    ```sh
-   yarn pod-install sample/ios
+   pnpm pod-install sample/ios
    ```
 
 3. Build the Native Module
 
    ```sh
-   yarn module build
+   pnpm module build
    ```
 
 4. Start the Metro server
 
    ```sh
-   yarn sample start
+   pnpm sample start
    ```
 
 5. Run the sample application (in a new terminal / tab)
 
    ```sh
-   yarn sample ios
+   pnpm sample ios
    # or
-   yarn sample android
+   pnpm sample android
    ```
 
 ## Optional: Speed up builds with sccache
@@ -68,8 +68,8 @@ The build scripts will automatically detect and use sccache if available. If you
 
 ```sh
 # Disable sccache for a single build
-SCCACHE=false yarn sample ios
-SCCACHE=false yarn sample android
+SCCACHE=false pnpm sample ios
+SCCACHE=false pnpm sample android
 ```
 
 ## Making changes to the Native Module
@@ -80,23 +80,23 @@ observe your changes in the sample app. This is because the sample app is
 importing the TS files directly from the module directory (through symlinking).
 
 However, if you're running the iOS/Android tests against the module, you will
-first need to run `yarn module build` each time you change the TS code.
+first need to run `pnpm module build` each time you change the TS code.
 
 ## Cleaning the workspaces
 
 There are a handful of commands to clean the individual workspaces.
 
 ```sh
 # Clear the current directory from watchman
-yarn clean
+pnpm clean
 
 # Removes the "sample/node_modules" directory
 # Removes "ios/pods" directory
 # Removes "ios/build" directory
-yarn sample clean
+pnpm sample clean
 
 # Removes the "lib" directory for the Native Module
-yarn module clean
+pnpm module clean
 ```
 
 ## Linting the code
@@ -106,10 +106,10 @@ eslint over the source code.
 
 ```sh
 # Lint the Native Module TS code
-yarn module lint
+pnpm module lint
 
 # Lint the Sample App TS code
-yarn sample lint
+pnpm sample lint
 ```
 
 ## Testing
@@ -119,13 +119,13 @@ testing the Native Module.
 
 ```sh
 # Run Jest tests for "modules/@shopify/checkout-sheet-kit/src/**/*.tsx"
-yarn test
+pnpm test
 
 # Run swift tests for the Native Module
-yarn sample test:ios
+pnpm sample test:ios
 
 # Run Java tests for the Native Module
-yarn sample test:android
+pnpm sample test:android
 ```
 
 ## Running the sample app
@@ -136,19 +136,19 @@ commands at the root of the project directory.
 ### Install NPM dependencies
 
 ```sh
-yarn
+pnpm install
 ```
 
 ### Install Cocoapods
 
 ```sh
-yarn pod-install sample/ios
+pnpm pod-install sample/ios
 ```
 
 ### Build the local module
 
 ```sh
-yarn module build
+pnpm module build
 ```
 
 ### Update the dotenv file
@@ -166,5 +166,5 @@ STOREFRONT_VERSION="2025-07"
 ### Start the sample app
 
 ```sh
-yarn sample start
+pnpm sample start
 ```

.yarnrc.yml

@@ -80,6 +80,9 @@ application:
 Install the Shopify Checkout Kit package dependency:
 
 ```sh
+pnpm add @shopify/checkout-sheet-kit
+
+# or using yarn
 yarn add @shopify/checkout-sheet-kit
 
 # or using npm