Replace legacy yarn with pnpm

Author: EhabY

.github/workflows/ci.yaml

@@ -17,18 +17,20 @@ jobs:
     steps:
       - uses: actions/checkout@v6
 
+      - uses: pnpm/action-setup@v4
+
       - uses: actions/setup-node@v6
         with:
           node-version: "22"
-          cache: "yarn"
+          cache: "pnpm"
 
-      - run: yarn
+      - run: pnpm install
 
-      - run: yarn prettier --check .
+      - run: pnpm prettier --check .
 
-      - run: yarn lint
+      - run: pnpm lint
 
-      - run: yarn build
+      - run: pnpm build
 
   test-unit:
     name: Unit Test (Electron ${{ matrix.electron-version }})
@@ -42,12 +44,14 @@ jobs:
     steps:
       - uses: actions/checkout@v6
 
+      - uses: pnpm/action-setup@v4
+
       - uses: actions/setup-node@v6
         with:
           node-version: "22"
-          cache: "yarn"
+          cache: "pnpm"
 
-      - run: yarn
+      - run: pnpm install
 
       - name: Run tests with Electron ${{ matrix.electron-version }}
         run: ./scripts/test-electron.sh ${{ matrix.electron-version }}
@@ -65,17 +69,19 @@ jobs:
     steps:
       - uses: actions/checkout@v6
 
+      - uses: pnpm/action-setup@v4
+
       - uses: actions/setup-node@v6
         with:
           node-version: "22"
-          cache: "yarn"
+          cache: "pnpm"
 
-      - run: yarn
+      - run: pnpm install
 
-      - run: yarn build
+      - run: pnpm build
 
       - name: Run integration tests on VS Code ${{ matrix.vscode-version }}
-        run: xvfb-run -a yarn test:integration --label "VS Code ${{ matrix.vscode-version }}"
+        run: xvfb-run -a pnpm test:integration --label "VS Code ${{ matrix.vscode-version }}"
 
   package:
     name: Package
@@ -84,15 +90,15 @@ jobs:
     steps:
       - uses: actions/checkout@v6
 
+      - uses: pnpm/action-setup@v4
+
       - uses: actions/setup-node@v6
         with:
           node-version: "22"
-          cache: "yarn"
+          cache: "pnpm"
 
       - name: Install dependencies
-        run: |
-          yarn
-          npm install -g @vscode/vsce
+        run: pnpm install
 
       - name: Get version from package.json
         id: version
@@ -111,7 +117,7 @@ jobs:
           echo "packageName=$PACKAGE_NAME" >> $GITHUB_OUTPUT
 
       - name: Package extension
-        run: vsce package --out "${{ steps.setup.outputs.packageName }}"
+        run: pnpm vsce package --no-dependencies --out "${{ steps.setup.outputs.packageName }}"
 
       - name: Upload artifact (PR)
         if: github.event_name == 'pull_request'

.github/workflows/pre-release.yaml

@@ -18,9 +18,12 @@ jobs:
     steps:
       - uses: actions/checkout@v6
 
+      - uses: pnpm/action-setup@v4
+
       - uses: actions/setup-node@v6
         with:
           node-version: "22"
+          cache: "pnpm"
 
       - name: Extract version from tag
         id: version
@@ -45,9 +48,7 @@ jobs:
           echo "Version validation successful: $TAG_VERSION"
 
       - name: Install dependencies
-        run: |
-          yarn
-          npm install -g @vscode/vsce
+        run: pnpm install
 
       - name: Setup package path
         id: setup
@@ -57,7 +58,7 @@ jobs:
           echo "packageName=$PACKAGE_NAME" >> $GITHUB_OUTPUT
 
       - name: Package extension
-        run: vsce package --pre-release --out "${{ steps.setup.outputs.packageName }}"
+        run: pnpm vsce package --no-dependencies --pre-release --out "${{ steps.setup.outputs.packageName }}"
 
       - name: Upload artifact
         uses: actions/upload-artifact@v6

.github/workflows/release.yaml

@@ -19,9 +19,12 @@ jobs:
     steps:
       - uses: actions/checkout@v6
 
+      - uses: pnpm/action-setup@v4
+
       - uses: actions/setup-node@v6
         with:
           node-version: "22"
+          cache: "pnpm"
 
       - name: Extract version from tag
         id: version
@@ -45,9 +48,7 @@ jobs:
           echo "Version validation successful: $TAG_VERSION"
 
       - name: Install dependencies
-        run: |
-          yarn
-          npm install -g @vscode/vsce
+        run: pnpm install
 
       - name: Setup package path
         id: setup
@@ -57,7 +58,7 @@ jobs:
           echo "packageName=$PACKAGE_NAME" >> $GITHUB_OUTPUT
 
       - name: Package extension
-        run: vsce package --out "${{ steps.setup.outputs.packageName }}"
+        run: pnpm vsce package --no-dependencies --out "${{ steps.setup.outputs.packageName }}"
 
       - name: Upload artifact
         uses: actions/upload-artifact@v6

.gitignore

@@ -5,5 +5,5 @@
 /.nyc_output/
 /coverage/
 *.vsix
-yarn-error.log
+pnpm-debug.log
 .eslintcache

.prettierignore

@@ -6,4 +6,5 @@
 /coverage/
 *.vsix
 flake.lock
-yarn-error.log
+pnpm-debug.log
+pnpm-lock.yaml

.vscodeignore

@@ -24,7 +24,8 @@ esbuild.mjs
 **/.git-blame-ignore-revs
 
 # Package manager files
-yarn.lock
+pnpm-lock.yaml
+pnpm-workspace.yaml
 
 # Nix/flake files
 flake.nix

CLAUDE.md

@@ -46,18 +46,18 @@ Comments explain what code does or why it exists:
 
 ## Build and Test Commands
 
-- Build: `yarn build`
-- Watch mode: `yarn watch`
-- Package: `yarn package`
-- Format: `yarn fmt`
-- Format check: `yarn fmt:check`
-- Lint: `yarn lint`
-- Lint with auto-fix: `yarn lint:fix`
-- Run all tests: `yarn test`
-- Unit tests: `yarn test:ci`
-- Integration tests: `yarn test:integration`
-- Run specific unit test: `yarn test:ci ./test/unit/filename.test.ts`
-- Run specific integration test: `yarn test:integration ./test/integration/filename.test.ts`
+- Build: `pnpm build`
+- Watch mode: `pnpm watch`
+- Package: `pnpm package`
+- Format: `pnpm fmt`
+- Format check: `pnpm fmt:check`
+- Lint: `pnpm lint`
+- Lint with auto-fix: `pnpm lint:fix`
+- Run all tests: `pnpm test`
+- Unit tests: `pnpm test:ci`
+- Integration tests: `pnpm test:integration`
+- Run specific unit test: `pnpm test:ci ./test/unit/filename.test.ts`
+- Run specific integration test: `pnpm test:integration ./test/integration/filename.test.ts`
 
 ## Code Style
 

CONTRIBUTING.md

@@ -80,16 +80,17 @@ The link format is `vscode://coder.coder-remote/open?${query}`. For example:
 code --open-url 'vscode://coder.coder-remote/open?url=dev.coder.com&owner=my-username&workspace=my-ws&agent=my-agent'
 ```
 
-There are some unit tests as well:
+There are unit tests using `vitest` with mocked VS Code APIs:
 
 ```bash
-yarn test
+pnpm test:ci
 ```
 
-Note that we have an unusual testing setup with `vitest`; this needs to be
-changed back to how using the standard testing framework for VS Code extensions
-was but for now it means some things are difficult to test as you cannot import
-`vscode` in tests or write any UI tests.
+There are also integration tests that run inside a real VS Code instance:
+
+```bash
+pnpm test:integration
+```
 
 ## Development
 
@@ -98,7 +99,7 @@ was but for now it means some things are difficult to test as you cannot import
 > this extension from a coder workspace. We currently recommend cloning the
 > repo locally
 
-1. Run `yarn watch` in the background.
+1. Run `pnpm watch` in the background.
 2. OPTIONAL: Compile the `coder` binary and place it in the equivalent of
    `os.tmpdir() + "/coder"`. If this is missing, it will download the binary
    from the Coder deployment, as it normally would. Reading from `/tmp/coder` is
@@ -123,7 +124,7 @@ Some dependencies are not directly used in the source but are required anyway.
 - `bufferutil` and `utf-8-validate` are peer dependencies of `ws`.
 - `ua-parser-js` and `dayjs` are used by the Coder API client.
 
-The coder client is vendored from coder/coder. Every now and then, we should be running `yarn upgrade coder --latest`
+The coder client is vendored from coder/coder. Every now and then, we should be running `pnpm update coder`
 to make sure we're using up to date versions of the client.
 
 ## Releasing

flake.nix

@@ -7,12 +7,10 @@
     flake-utils.lib.eachDefaultSystem
       (system:
         let pkgs = nixpkgs.legacyPackages.${system};
-            nodejs = pkgs.nodejs;
-            yarn' = pkgs.yarn.override { inherit nodejs; };
         in {
           devShells.default = pkgs.mkShell {
             nativeBuildInputs = with pkgs; [
-              nodejs yarn'
+              nodejs nodePackages.pnpm
             ];
           };
         }

package.json

@@ -23,14 +23,14 @@
 		"fmt": "prettier --write --cache --cache-strategy content .",
 		"fmt:check": "prettier --check --cache --cache-strategy content .",
 		"lint": "eslint --cache --cache-strategy content .",
-		"lint:fix": "yarn lint --fix",
-		"package": "vsce package",
-		"package:prerelease": "vsce package --pre-release",
-		"pretest": "tsc -p test --noEmit && yarn fmt:check && yarn lint",
+		"lint:fix": "pnpm lint --fix",
+		"package": "vsce package --no-dependencies",
+		"package:prerelease": "vsce package --pre-release --no-dependencies",
+		"pretest": "tsc -p test --noEmit && pnpm fmt:check && pnpm lint",
 		"test": "ELECTRON_RUN_AS_NODE=1 electron node_modules/vitest/vitest.mjs",
-		"test:ci": "CI=true yarn test",
+		"test:ci": "CI=true pnpm test",
 		"test:integration": "tsc -p test --outDir out && node esbuild.mjs && vscode-test",
-		"vscode:prepublish": "yarn build:production",
+		"vscode:prepublish": "pnpm build:production",
 		"watch": "node esbuild.mjs --watch"
 	},
 	"contributes": {
@@ -422,6 +422,7 @@
 	"devDependencies": {
 		"@eslint/js": "^9.39.2",
 		"@eslint/markdown": "^7.5.1",
+		"@types/mocha": "^10.0.10",
 		"@types/node": "^20",
 		"@types/node-forge": "^1.3.14",
 		"@types/proper-lockfile": "^4.1.4",
@@ -457,7 +458,7 @@
 	"extensionPack": [
 		"ms-vscode-remote.remote-ssh"
 	],
-	"packageManager": "yarn@1.22.22+sha512.a6b2f7906b721bba3d67d4aff083df04dad64c399707841b7acf00f6b133b7ac24255f2652fa22ae3534329dc6180534e98d17432037ff6fd140556e2bb3137e",
+	"packageManager": "pnpm@10.27.0",
 	"engines": {
 		"vscode": "^1.95.0",
 		"node": ">= 20"