vscode-extension: upgrade from Yarn 1 to Yarn 4

.github/workflows/vscode-ext-release.yaml

@@ -21,17 +21,21 @@ jobs:
           node-version: 24
       - name: Install dependencies
         run: |
-          npm install -g yarn
-          npm install -g vsce
-          npm install -g ovsx
-          yarn install
+          corepack enable
+          npm install -g @vscode/vsce ovsx
+          yarn install --immutable
         working-directory: vscode-extension
+      # vsce/ovsx --yarn run `yarn list`, which Yarn 4 doesn't have, so we
+      # package with --no-yarn (npm list over the node_modules tree that Yarn
+      # created with nodeLinker: node-modules) and publish the built .vsix.
       - name: publish-vs
         run: |
-          vsce publish -p ${{ secrets.VS_MARKETPLACE_TOKEN }} --yarn --skip-duplicate
+          vsce package --no-yarn -o devbox-vs.vsix
+          vsce publish -p ${{ secrets.VS_MARKETPLACE_TOKEN }} --packagePath devbox-vs.vsix --skip-duplicate
         working-directory: vscode-extension
       - name: publish-ovsx
         run: |
           sed -i 's/"publisher": "jetpack-io"/"publisher": "Jetify"/g' package.json
-          ovsx publish --pat ${{ secrets.OVSX_MARKETPLACE_TOKEN }} --yarn --skip-duplicate
+          vsce package --no-yarn -o devbox-ovsx.vsix
+          ovsx publish devbox-ovsx.vsix --pat ${{ secrets.OVSX_MARKETPLACE_TOKEN }} --skip-duplicate
         working-directory: vscode-extension

vscode-extension/.gitignore

@@ -1,4 +1,9 @@
 node_modules
 out
 .vscode
-.DS_Store
+.DS_Store
+.yarn/*
+!.yarn/patches
+!.yarn/plugins
+!.yarn/releases
+*.vsix

vscode-extension/.vscodeignore

@@ -2,7 +2,8 @@
 .vscode-test/**
 src/**
 .gitignore
-.yarnrc
+.yarnrc.yml
+.yarn/**
 vsc-extension-quickstart.md
 **/tsconfig.json
 **/eslint.config.mjs

vscode-extension/.yarnrc.yml

@@ -0,0 +1,8 @@
+approvedGitRepositories:
+  - "**"
+
+enableScripts: true
+
+nodeLinker: node-modules
+
+npmMinimalAgeGate: 0

vscode-extension/package.json

@@ -162,5 +162,6 @@
   },
   "dependencies": {
     "which": "^7.0.0"
-  }
+  },
+  "packageManager": "yarn@4.18.1+sha512.b2e1e7524f654f2749d32b4ebcb4622473cb5bcbc485df2007e12a154e50162a4d795526768bc5f5b8f81717bfd79deb2472813d86fb5ae2eb551fa9c872b08f"
 }