GLSP-1636: Switch client build from yarn/lerna to pnpm

- Migrate the client workspace from Yarn 1.x + Lerna to a pnpm
  workspace (pnpm-workspace.yaml, pinned 'packageManager', and an
  'only-allow pnpm' preinstall guard)
- Replace lerna-based publish/clean/index scripts with pnpm '-r' and
  'glsp releng publish' commands
- Declare previously-phantom dependencies explicitly and use the
  'workspace:*' protocol for the in-repo @eclipse-glsp/ide reference,
  as pnpm's strict node_modules layout requires
- Update GitHub Actions (ci/codeql/publish) and the Jenkins pipeline to
  install, build, and cache with pnpm
- Remove yarn.lock and lerna.json; add pnpm-lock.yaml
- Update README/AGENTS docs and VS Code tasks to reference pnpm

Also:
- Add a 'fix' client fix-and-verify skill

Part of: eclipse-glsp/glsp#1636

Author: tortmayr

.claude/skills/fix/SKILL.md

@@ -0,0 +1,31 @@
+---
+name: fix
+description: Run the fix-and-verify suite for the client workspace (build, auto-fix lint/format/headers). IMPORTANT - Proactively invoke this skill after completing any code changes to the client (new features, bug fixes, refactors) before reporting completion. Re-run it after manually addressing anything it could not auto-fix.
+---
+
+Run the auto-fix and validation suite for the GLSP Eclipse Integration client monorepo. All commands run from the `client/` directory (the pnpm workspace root):
+
+```bash
+cd client
+```
+
+1. Build first (compiles all TypeScript packages and bundles the workflow webapp). This is a hard gate: if the build fails, stop immediately, report the build errors, and do not run any of the following steps.
+   The build must pass before anything else runs.
+
+```bash
+pnpm build
+```
+
+2. Auto-fix lint, formatting, and copyright headers. Run all three even if an earlier one reports remaining problems (they are independent):
+
+```bash
+pnpm lint:fix
+pnpm format
+pnpm headers:fix
+```
+
+Then:
+
+- If `pnpm build` failed, fix the compile errors and re-run this skill.
+- If `pnpm lint:fix` reported lint errors it could not fix, fix them manually and re-run this skill.
+- Otherwise if everything is clean (compile succeeds, formatting and headers are corrected in place, lint has no remaining errors) — report completion.

.github/workflows/ci.yml

@@ -17,35 +17,35 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
       - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
+      - uses: pnpm/action-setup@0e279bb959325dab635dd2c09392533439d90093 # v6.0.8
+        with:
+          package_json_file: client/package.json
       - uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6.4.0
         with:
           node-version: 22.x
+          cache: pnpm
+          cache-dependency-path: client/pnpm-lock.yaml
       - name: Build
         working-directory: ./client
-        run: yarn install
-      - name: Check for uncommitted changes in yarn.lock
-        run: |
-          if git diff --name-only | grep -q "^client/yarn.lock"; then
-            echo "::error::The yarn.lock file has uncommitted changes!"
-            exit 1
-          fi
+        run: pnpm build
   lint:
     name: Lint
     timeout-minutes: 60
     runs-on: ubuntu-22.04
     steps:
       - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
+      - uses: pnpm/action-setup@0e279bb959325dab635dd2c09392533439d90093 # v6.0.8
+        with:
+          package_json_file: client/package.json
       - uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6.4.0
         with:
           node-version: 22.x
-      - name: Install
-        working-directory: ./client
-        run: |
-          yarn install
+          cache: pnpm
+          cache-dependency-path: client/pnpm-lock.yaml
       - name: Create eslint json report
         working-directory: ./client
         run: |
-          yarn lint:ci
+          pnpm lint:ci
       - name: Create summary
         if: always()
         working-directory: ./client

.github/workflows/codeql-analysis.yml

@@ -58,11 +58,16 @@ jobs:
         run: mvn -B clean verify --file pom.xml
         working-directory: server
 
-      - name: Build Client with yarn
+      - uses: pnpm/action-setup@0e279bb959325dab635dd2c09392533439d90093 # v6.0.8
+        with:
+          package_json_file: client/package.json
+      - name: Build Client with pnpm
         uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6.4.0
         with:
           node-version: '22'
-      - run: yarn install
+          cache: pnpm
+          cache-dependency-path: client/pnpm-lock.yaml
+      - run: pnpm build
 
       # ℹ️ Command-line programs to run using the OS shell.
       # 📚 https://git.io/JvXDl

.github/workflows/publish.yml

@@ -45,7 +45,7 @@ jobs:
       - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
         with:
           ref: ${{ inputs.ref || github.event.inputs.ref || github.event.workflow_run.head_commit.id || github.sha }}
-          # Fetch all history for lerna to determine versions
+          # Fetch all history to determine the canary version (commits since last tag)
           fetch-depth: 0
 
       - name: Check for changes in "client/packages" directory
@@ -64,26 +64,33 @@ jobs:
             echo "should_publish=true" >> $GITHUB_OUTPUT
           fi
 
+      - uses: pnpm/action-setup@0e279bb959325dab635dd2c09392533439d90093 # v6.0.8
+        if: steps.check_changes.outputs.should_publish == 'true'
+        with:
+          package_json_file: client/package.json
+
       - uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6.4.0
         if: steps.check_changes.outputs.should_publish == 'true'
         with:
           node-version: 22.x
           registry-url: 'https://registry.npmjs.org'
+          cache: pnpm
+          cache-dependency-path: client/pnpm-lock.yaml
 
       - name: Build
         working-directory: ./client
         if: steps.check_changes.outputs.should_publish == 'true'
-        run: yarn
+        run: pnpm compile
 
       - name: Publish to NPM
         if: steps.check_changes.outputs.should_publish == 'true'
         working-directory: ./client
         run: |
           DIST_TAG="${{ inputs.dist-tag || github.event.inputs.dist-tag || 'next' }}"
           if [[ "$DIST_TAG" == "next" ]]; then
-             yarn publish:next
+             pnpm publish:next
           elif [[ "$DIST_TAG" == "latest" ]]; then
-             yarn publish:latest
+             pnpm publish:latest
           else
             echo "Unknown dist-tag: $DIST_TAG"
             exit 1

AGENTS.md

@@ -2,7 +2,7 @@
 
 ## Project Structure & Module Organization
 This repository is split into two main parts:
-- `client/`: TypeScript/Yarn workspace for the GLSP IDE integration package and workflow webapp example.
+- `client/`: TypeScript/pnpm workspace for the GLSP IDE integration package and workflow webapp example.
   - `client/packages/ide/src/`: reusable integration source.
   - `client/examples/workflow-webapp/src/`: example app source, bundled to `client/examples/workflow-webapp/app/`.
 - `server/`: Java 17 + Maven/Tycho Eclipse plugin build.
@@ -11,26 +11,25 @@ This repository is split into two main parts:
   - `server/releng/`: target platform, feature, and p2 repository modules.
 
 ## Build, Test, and Development Commands
-- `cd client && yarn install`: install workspace dependencies (Node `>=22`, Yarn 1.x).
-- `cd client && yarn build`: compile TS packages and bundle the workflow webapp.
-- `cd client && yarn lint`: run ESLint on all TS/TSX sources.
-- `cd client && yarn format:check`: verify Prettier formatting.
-- `cd client && yarn check:pr`: CI-like client gate (`build`, `lint`, `format:check`, headers).
-- `cd client/examples/workflow-webapp && yarn test`: run Mocha specs (`*.spec.ts|tsx`) for the example app.
+The client is a pnpm workspace — do not use yarn or npm. A recent pnpm switches to the version pinned in `client/package.json`'s `packageManager` field.
+- `cd client && pnpm install`: install workspace dependencies (Node `>=22`, pnpm 11+).
+- `cd client && pnpm build`: compile TS packages and bundle the workflow webapp.
+- `cd client && pnpm lint`: run ESLint on all TS/TSX sources.
+- `cd client && pnpm format:check`: verify Prettier formatting.
+- `cd client && pnpm check:all`: CI-like client gate (`install`, `lint`, `format:check`, headers).
+- `cd client && pnpm copy:client`: copy the bundled webapp into the server's diagram folder.
 - `cd server && mvn clean install`: build Eclipse bundles.
 - `cd server && mvn clean install -Pp2`: build including p2 artifacts.
 - `cd server && mvn checkstyle:check -B`: run Java style checks.
 
 ## Coding Style & Naming Conventions
 - TypeScript: 4-space indentation, single quotes, trailing commas disabled, max line length 140 (see `.prettierrc`).
-- Linting: ESLint with `@eclipse-glsp` config (`client/.eslintrc.js`).
+- Linting: ESLint with `@eclipse-glsp` config (`client/eslint.config.mjs`).
 - Java: follow Checkstyle rules configured via Maven (`maven-checkstyle-plugin`).
 - Naming: keep existing conventions (`*.spec.ts` for tests, PascalCase Java classes, kebab-case TS file names where already used).
 
 ## Testing Guidelines
-Prefer targeted tests for changed behavior:
-- Client example tests live beside sources and should match `*.spec.ts`/`*.spec.tsx`.
-- Run `yarn check:pr` for client-side validation before opening a PR.
+- Validate client changes by running `pnpm check:all` (from `client/`) before opening a PR.
 - For server changes, run `mvn clean verify` (or at least `mvn clean install`) and `mvn checkstyle:check`.
 
 ## Commit & Pull Request Guidelines

Jenkinsfile

@@ -4,7 +4,7 @@ kind: Pod
 spec:
   containers:
   - name: ci
-    image: eclipseglsp/ci:alpine-v8.0
+    image: eclipseglsp/ci:alpine-v9.0
     resources:
       limits:
         memory: "2Gi"
@@ -22,8 +22,8 @@ spec:
     - mountPath: "/home/jenkins"
       name: "jenkins-home"
       readOnly: false
-    - mountPath: "/.yarn"
-      name: "yarn-global"
+    - mountPath: "/.pnpm-store"
+      name: "pnpm-store"
       readOnly: false
     - name: settings-xml
       mountPath: /home/jenkins/.m2/settings.xml
@@ -61,7 +61,7 @@ spec:
   volumes:
   - name: "jenkins-home"
     emptyDir: {}
-  - name: "yarn-global"
+  - name: "pnpm-store"
     emptyDir: {}
   - name: settings-xml
     secret:
@@ -102,7 +102,9 @@ pipeline {
     }
 
     environment {
-        YARN_CACHE_FOLDER = "${env.WORKSPACE}/yarn-cache"
+        npm_config_store_dir = "${env.WORKSPACE}/.pnpm-store"
+        // CI=true makes pnpm's implicit pre-run install a frozen-lockfile install.
+        CI = "true"
         SPAWN_WRAP_SHIM_ROOT = "${env.WORKSPACE}"
         EMAIL_TO= "glsp-build@eclipse.org"
     }
@@ -139,14 +141,9 @@ pipeline {
                 container('ci') {
                     timeout(30){
                         dir('client') {
-                            sh "yarn install"
-                            script {
-                                // Fail the step if there are uncommited changes to the yarn.lock file
-                                if (sh(returnStatus: true, script: 'git diff --name-only | grep -q "^client/yarn.lock"') == 0) {
-                                    echo 'The yarn.lock file has uncommited changes!'
-                                    error 'The yarn.lock file has uncommited changes!'
-                                }
-                            }
+                            sh "pnpm build"
+                            // Copy the webapp bundle into the server's diagram folder for the server build.
+                            sh "pnpm copy:client"
                         }
                     }
                 }

README.md

@@ -16,7 +16,7 @@ https://user-images.githubusercontent.com/588090/161574154-1da641be-86e1-4d4b-8c
 
 ### How to start the Workflow Diagram example?
 
-First, you need to build both the client and the server (see instructions on [building the client](client/README.md#building) and [building the server](server/README.md#building)).
+First, you need to build both the client and the server (see instructions on [building the client](client/README.md#developer-documentation) and [building the server](server/README.md#building)).
 Then, import the following Eclipse plug-in projects into your Eclipse IDE workspace:
 
 - `server/plugins/org.eclipse.glsp.ide.editor`

client/.prettierignore

@@ -11,7 +11,7 @@ dist/
 
 # Lock files
 package-lock.json
-yarn.lock
+pnpm-lock.yaml
 examples/workflow-webapp/app
 # Logs
 *.log

client/.vscode/tasks.json

@@ -10,7 +10,7 @@
         "kind": "build",
         "isDefault": true
       },
-      "command": "yarn",
+      "command": "pnpm build",
       "presentation": {
         "reveal": "always",
         "panel": "new"
@@ -21,7 +21,7 @@
       "label": "Watch all packages",
       "type": "shell",
       "group": "test",
-      "command": "yarn watch",
+      "command": "pnpm watch",
       "presentation": {
         "reveal": "always",
         "panel": "new"

client/README.md

@@ -3,9 +3,22 @@
 Contains the client side glue code for opening browser-based GLSP diagrams in an Eclipse IDE editor as well as the workflow webapp example.
 This project is available from npm via [@eclipse-glsp/ide](https://www.npmjs.com/package/@eclipse-glsp/ide).
 
-## Building
+## Developer Documentation
 
-To build this project locally, run `yarn` in this directory.
+### First time setup
+
+- Install [node.js](https://nodejs.org/) (requires Node v22+)
+- Install pnpm: <https://pnpm.io/installation> (use pnpm 11+); a recent pnpm automatically switches to the version pinned in the `packageManager` field
+- Clone this repository
+- Install dependencies from this `client` directory: `pnpm i` or `pnpm i --frozen-lockfile`
+
+### Build & Testing
+
+- Build (all packages + workflow webapp bundle): `pnpm build`
+- Lint: `pnpm lint`
+- Check formatting: `pnpm format:check`
+- Clean (all packages): `pnpm clean`
+- `pnpm copy:client` copies the bundled webapp into the Eclipse server's diagram folder (`../server/example/org.eclipse.glsp.ide.workflow.editor/diagram`); the Jenkins build runs this automatically before building the server.
 
 ## More information