Move from gulp to node scripts

.devcontainer/devcontainer.json

@@ -56,5 +56,5 @@
       ]
     }
   },
-  "postCreateCommand": "npm ci && npx gulp installDependencies && npm i -g gulp"
+  "postCreateCommand": "npm ci"
 }

.github/copilot-instructions.md

@@ -17,18 +17,18 @@
 - **Build**: `npm run compile` (or use VS Code build task)
 - **Test**: `npm test` (runs Jest tests)
 - **Package**: `npm run package` (creates VSIX)
-- **Dependencies**: Use `gulp installDependencies` to fetch .NET/LS components
+- **Dependencies**: Use `npm run installDependencies` to fetch .NET/LS components
 - **Debugging**: See `docs/debugger/` for advanced .NET debugging, including runtime and external library debugging.
 - **Roslyn Copilot Language Server**: To update/test, see instructions in `CONTRIBUTING.md` (triggers pipeline, checks logs for install, etc.)
 
 ## Infrastructure Tasks
-- **Tasks Directory**: Build automation is in `tasks/` using Gulp. Key modules:
+- **Tasks Directory**: Build automation is in `tasks/` with one script per task under task-area folders such as `tasks/packaging/`, `tasks/tests/`, etc. Key modules:
   - `testTasks.ts`: Test orchestration for unit/integration tests across components
   - `offlinePackagingTasks.ts`: VSIX packaging for different platforms (`vsix:release:package:*`)
   - `componentUpdateTasks.ts`: Automated updates for Roslyn Copilot components
   - `snapTasks.ts`: Version bumping and changelog management for releases
   - `gitTasks.ts`: Git operations for automated PR creation and branch management
-- **Adding New Tasks**: Create `.ts` file in `tasks/`, define `gulp.task()` functions, require in `gulpfile.ts`
+- **Adding New Tasks**: Create a dedicated `.ts` entry script under the matching area in `tasks/` and matching scripts entry in the `package.json`
 - **Task Patterns**: Use `projectPaths.ts` for consistent path references, follow existing naming conventions (`test:integration:*`, `vsix:*`, etc.)
 
 ## Project Conventions & Patterns

.github/skills/update-roslyn-version/SKILL.md

@@ -45,12 +45,12 @@ Update the `defaults.roslyn` field in `package.json`:
 }
 ```
 
-### Step 3: Run gulp updateRoslynVersion
+### Step 3: Run updateRoslynVersion
 
 This step acquires the new Roslyn packages and ensures they are in the proper feeds:
 
 ```powershell
-gulp updateRoslynVersion
+npm run updateRoslynVersion
 ```
 
 This task:
@@ -62,7 +62,7 @@ This task:
 
 ### Step 4: Get the Previous Roslyn Commit SHA
 
-The commit SHAs are stored in the `.nuspec` files inside the downloaded NuGet packages. After running `gulp updateRoslynVersion`, the new version's package will be cached locally, but you need to explicitly download the old version to get its commit SHA.
+The commit SHAs are stored in the `.nuspec` files inside the downloaded NuGet packages. After running `npm run updateRoslynVersion`, the new version's package will be cached locally, but you need to explicitly download the old version to get its commit SHA.
 
 **To get the old version's commit SHA:**
 
@@ -82,7 +82,7 @@ The commit SHAs are stored in the `.nuspec` files inside the downloaded NuGet pa
 
 ### Step 5: Get the New Roslyn Commit SHA
 
-After running `gulp updateRoslynVersion`, the new version's package is already cached. Extract the commit SHA:
+After running `npm run updateRoslynVersion`, the new version's package is already cached. Extract the commit SHA:
 
 ```powershell
 Get-Content "C:\Users\<username>\source\repos\vscode-csharp\out\.nuget\roslyn-language-server.osx-arm64\<new-version>\roslyn-language-server.osx-arm64.nuspec" | Select-String -Pattern "commit"
@@ -183,7 +183,7 @@ For updating from `5.4.0-2.26077.7` to `5.5.0-2.26080.10`:
 4. Find new commit from package metadata for version `5.5.0-2.26080.10`
 5. Run pr-finder in roslyn repo
 6. Update CHANGELOG.md with the output
-7. Run `gulp updateRoslynVersion`
+7. Run `npm run updateRoslynVersion`
 8. Create PR titled "Update roslyn to 5.5.0-2.26080.10"
 9. Update changelog with PR number
 
@@ -198,7 +198,7 @@ See [PR #8941](https://github.com/dotnet/vscode-csharp/pull/8941) as an example
 
 ## Troubleshooting
 
-### Authentication Issues with gulp updateRoslynVersion
+### Authentication Issues with updateRoslynVersion
 
 If you encounter authentication errors:
 1. Install Azure Artifacts Credential Provider
@@ -216,7 +216,7 @@ Ensure:
 
 The commit SHAs are embedded in the nuspec files inside the downloaded NuGet packages:
 
-1. After running `gulp updateRoslynVersion`, packages are cached in `out/.nuget/`
+1. After running `npm run updateRoslynVersion`, packages are cached in `out/.nuget/`
 2. To get the old version's commit, you may need to explicitly download it first:
    ```powershell
    dotnet restore "msbuild\server" /p:PackageName=roslyn-language-server.osx-arm64 /p:PackageVersion=<old-version> --interactive

.github/workflows/branch-snap.yml

@@ -34,9 +34,9 @@ jobs:
       - name: Update version.json
         run: |
           if [ "${{ github.event.inputs.releaseCandidate }}" = "true" ]; then
-            npx gulp incrementVersion --releaseCandidate=true
+            npm run incrementVersion -- --releaseCandidate=true
           else
-            npx gulp incrementVersion
+            npm run incrementVersion
           fi
       - name: Create version update PR
         uses: peter-evans/create-pull-request@v4
@@ -63,7 +63,7 @@ jobs:
       - name: Install dependencies
         run: npm ci
       - name: Update version.json for release
-        run: npx gulp updateVersionForStableRelease
+        run: npm run updateVersionForStableRelease
       - name: Commit and push version update
         run: |
           git config user.name "github-actions[bot]"

.github/workflows/copilot-setup-steps.yml

@@ -40,16 +40,6 @@ jobs:
       - name: Install dependencies
         run: npm ci
 
-      # Install gulp globally (required for build tasks)
-      - name: Install gulp
-        run: npm install -g gulp
-
       # Install vsce (needed for packaging tasks)
       - name: Install vsce
         run: npm install -g vsce
-
-      # Install server dependencies (needed for integration tests and running)
-      - name: Install dependencies
-        run: gulp installDependencies
-
-

.github/workflows/update-changelog.yml

@@ -26,7 +26,7 @@ jobs:
       - name: Install dependencies
         run: npm ci
       - name: Update CHANGELOG
-        run: npx gulp updateChangelog
+        run: npm run updateChangelog
       - name: Create update PR
         uses: peter-evans/create-pull-request@v4
         with:

.vscode/launch.json

@@ -177,19 +177,19 @@
         {
             "type": "node",
             "request": "launch",
-            "name": "Debug gulp task",
+            "name": "Debug task",
             "preLaunchTask": "build",
-            "program": "${workspaceFolder}/node_modules/gulp/bin/gulp.js",
-            "args": ["${input:gulpTaskName}"],
+            "program": "${workspaceFolder}/node_modules/ts-node/dist/bin.js",
+            "args": ["tasks/${input:taskScript}"],
             "cwd": "${workspaceFolder}"
         },
         {
             "type": "node",
             "request": "launch",
             "name": "Update OmniSharp package dependencies",
             "preLaunchTask": "build",
-            "program": "${workspaceFolder}/node_modules/gulp/bin/gulp.js",
-            "args": ["updatePackageDependencies"],
+            "program": "${workspaceFolder}/node_modules/ts-node/dist/bin.js",
+            "args": ["tasks/debugger/updatePackageDependencies.ts"],
             "env": {
                 "NEW_DEPS_ID": "OmniSharp",
                 "NEW_DEPS_URLS": "https://roslynomnisharp.blob.core.windows.net/releases/1.39.14/omnisharp-linux-x64.zip,https://roslynomnisharp.blob.core.windows.net/releases/1.39.14/omnisharp-linux-x86.zip,https://roslynomnisharp.blob.core.windows.net/releases/1.39.14/omnisharp-linux-arm64.zip,https://roslynomnisharp.blob.core.windows.net/releases/1.39.14/omnisharp-osx.zip,https://roslynomnisharp.blob.core.windows.net/releases/1.39.14/omnisharp-win-x64.zip,https://roslynomnisharp.blob.core.windows.net/releases/1.39.14/omnisharp-win-arm64.zip,https://roslynomnisharp.blob.core.windows.net/releases/1.39.14/omnisharp-linux-musl-x64-net6.0.zip,https://roslynomnisharp.blob.core.windows.net/releases/1.39.14/omnisharp-linux-musl-arm64-net6.0.zip,https://roslynomnisharp.blob.core.windows.net/releases/1.39.14/omnisharp-linux-x64-net6.0.zip,https://roslynomnisharp.blob.core.windows.net/releases/1.39.14/omnisharp-linux-arm64-net6.0.zip,https://roslynomnisharp.blob.core.windows.net/releases/1.39.14/omnisharp-osx-x64-net6.0.zip,https://roslynomnisharp.blob.core.windows.net/releases/1.39.14/omnisharp-osx-arm64-net6.0.zip,https://roslynomnisharp.blob.core.windows.net/releases/1.39.14/omnisharp-win-x64-net6.0.zip,https://roslynomnisharp.blob.core.windows.net/releases/1.39.14/omnisharp-win-arm64-net6.0.zip",
@@ -203,8 +203,8 @@
             "request": "launch",
             "name": "Update razor telemetry package dependencies",
             "preLaunchTask": "build",
-            "program": "${workspaceFolder}/node_modules/gulp/bin/gulp.js",
-            "args": ["updatePackageDependencies"],
+            "program": "${workspaceFolder}/node_modules/ts-node/dist/bin.js",
+            "args": ["tasks/debugger/updatePackageDependencies.ts"],
             "env": {
                 "NEW_DEPS_URLS": "https://download.visualstudio.microsoft.com/download/pr/534f8426-a4f4-4b2d-b3ba-c4e16a38c48c/704e369c5905f9ece819ebce77fb78d8/devkittelemetry-linux-arm64-7.0.0-preview.24178.4.zip,https://download.visualstudio.microsoft.com/download/pr/534f8426-a4f4-4b2d-b3ba-c4e16a38c48c/4049a66147717a53860bbc969bf32faa/devkittelemetry-linux-musl-arm64-7.0.0-preview.24178.4.zip,https://download.visualstudio.microsoft.com/download/pr/534f8426-a4f4-4b2d-b3ba-c4e16a38c48c/c75e84ff813be5c9833d96dc2066a364/devkittelemetry-linux-musl-x64-7.0.0-preview.24178.4.zip,https://download.visualstudio.microsoft.com/download/pr/534f8426-a4f4-4b2d-b3ba-c4e16a38c48c/f58cf629939f0df77d142be881f9e233/devkittelemetry-linux-x64-7.0.0-preview.24178.4.zip,https://download.visualstudio.microsoft.com/download/pr/534f8426-a4f4-4b2d-b3ba-c4e16a38c48c/1c912419ea45c8d95cfa28a8a04640dc/devkittelemetry-osx-arm64-7.0.0-preview.24178.4.zip,https://download.visualstudio.microsoft.com/download/pr/534f8426-a4f4-4b2d-b3ba-c4e16a38c48c/36545ba0998f1fc380e877e38b2f35f1/devkittelemetry-osx-x64-7.0.0-preview.24178.4.zip,https://download.visualstudio.microsoft.com/download/pr/534f8426-a4f4-4b2d-b3ba-c4e16a38c48c/0a32698e8ba1ab93489d79f34f8ae8d0/devkittelemetry-platformagnostic-7.0.0-preview.24178.4.zip,https://download.visualstudio.microsoft.com/download/pr/534f8426-a4f4-4b2d-b3ba-c4e16a38c48c/4f16ff826fedd33ad80d265c5409588b/devkittelemetry-win-arm64-7.0.0-preview.24178.4.zip,https://download.visualstudio.microsoft.com/download/pr/534f8426-a4f4-4b2d-b3ba-c4e16a38c48c/5a98d8f4e481dbb7ae3cdb3695b75c46/devkittelemetry-win-x64-7.0.0-preview.24178.4.zip",
                 "NEW_DEPS_VERSION": "7.0.0-preview.24178.4",
@@ -217,17 +217,17 @@
             "request": "launch",
             "name": "Generate debugger options schema",
             "preLaunchTask": "build",
-            "program": "${workspaceFolder}/node_modules/gulp/bin/gulp.js",
-            "args": ["generateOptionsSchema"],
+            "program": "${workspaceFolder}/node_modules/ts-node/dist/bin.js",
+            "args": ["tasks/debugger/generateOptionsSchema.ts"],
             "cwd": "${workspaceFolder}"
         },
         {
             "type": "node",
             "request": "launch",
             "name": "Razor Cohost integration tests",
             "preLaunchTask": "build",
-            "program": "${workspaceFolder}/node_modules/gulp/bin/gulp.js",
-            "args": ["test:integration:razor:cohost"],
+            "program": "${workspaceFolder}/node_modules/ts-node/dist/bin.js",
+            "args": ["tasks/tests/testIntegrationRazorCohost.ts"],
             "cwd": "${workspaceFolder}"
         }
     ],
@@ -239,8 +239,8 @@
             "options": ["singleCsproj", "RazorApp", "slnWithCsproj", "slnFilterWithCsproj", "slnWithGenerator"]
         },
         {
-            "id": "gulpTaskName",
-            "description": "The name of the gulp task to debug",
+            "id": "taskScript",
+            "description": "The task script path under tasks (ex. `tests/testUnit.ts`)",
             "type": "promptString"
         }
     ]

CONTRIBUTING.md

@@ -38,9 +38,7 @@ Follow these steps to build, run, and test the repository:
 
 If you have the ability to run powershell, you can invoke "init.ps1" from the root of the repo. If not, the following steps will get build going for you as well:
 
-1. Run `npm i` - This command installs the project dependencies.
-2. Run `npm i -g gulp` - This command installs Gulp globally.
-3. Run `gulp installDependencies` - This command downloads the various dependencies as specified by the version in the [package.json](package.json) file.
+1. Run `npm ci` - This command installs the project dependencies.
 
 **Note**: Authentication with `ado-npm-auth` is only required when adding new packages to the feeds. For regular development with existing dependencies, authentication is not necessary. See the [Updating NPM packages](#updating-npm-packages) section for details.
 
@@ -164,7 +162,7 @@ To add new packages, you must authenticate by running:
 
 ## Creating VSIX Packages for the Extension
 
-To package this extension, we need to create VSIX Packages. The VSIX packages can be created using the gulp command `gulp vsix:release:package`. This will create all the platform specific VSIXs that you can then install manually in VSCode.
+To package this extension, we need to create VSIX Packages. The VSIX packages can be created using the command `npm run vsix:release:package`. This will create all the platform specific VSIXs that you can then install manually in VSCode.
 
 ## Updating the `Roslyn` Language Server Version
 
@@ -174,7 +172,7 @@ To update the version of the roslyn server used by the extension do the followin
 1.  Find the the Roslyn signed build you want from [here](https://dnceng.visualstudio.com/internal/_build?definitionId=327&_a=summary).  Typically the latest successful build of main is fine.
 2.  In the official build stage, look for the `Publish Assets` step.  In there you will see it publishing the `Microsoft.CodeAnalysis.LanguageServer.neutral` package with some version, e.g. `4.6.0-3.23158.4`.  Take note of that version number.
 3.  In the [package.json](package.json) inside the `defaults` section update the `roslyn` key to point to the version number you found above in step 2.
-4.  Ensure that version of the package is in the proper feeds by running `gulp updateRoslynVersion`. Note: you may need to install the [Azure Artifacts NuGet Credential Provider](https://github.com/microsoft/artifacts-credprovider#installation-on-windows) to run interactive authentication.
+4.  Ensure that version of the package is in the proper feeds by running `npm run updateRoslynVersion`. Note: you may need to install the [Azure Artifacts NuGet Credential Provider](https://github.com/microsoft/artifacts-credprovider#installation-on-windows) to run interactive authentication.
 5.  Build and test the change. If everything looks good, submit a PR.
 
 ## Updating the `Roslyn` Copilot Language Server version

azure-pipelines/build-vsix.yml

@@ -157,17 +157,17 @@ stages:
     - pwsh: |
         Write-Host "Building VSIXs for channel $(channel)"
         if ("$(channel)" -eq "Release") {
-          gulp vsix:release:package
+          npm run vsix:release:package
         } else {
-          gulp vsix:release:package --prerelease
+          npm run vsix:release:package -- --prerelease
         }
       displayName: 'Build VSIXs'
       env:
         SignType: $(signType)
         SYSTEM_ACCESSTOKEN: $(System.AccessToken)
 
     - ${{ if eq(parameters.isOfficial, true) }}:
-      - script: gulp signVsix
+      - script: npm run signVsix
         condition: succeeded()
         displayName: 'Sign VSIXs'
         env:
@@ -181,7 +181,7 @@ stages:
         TargetFolder: '$(Build.SourcesDirectory)/Packages/VSIX_$(channel)'
 
     - ${{ if eq(parameters.isOfficial, true) }}:
-      - script: gulp verifyVsix
+      - script: npm run verifyVsix
         condition: and( succeeded(), eq('$(SignType)', 'Real'))
         displayName: 🔑 Verify VSIX Signature Files
         workingDirectory: '$(Build.SourcesDirectory)/Packages/VSIX_$(channel)'

azure-pipelines/loc.yml

@@ -66,7 +66,6 @@ extends:
           fetchDepth: 0
         - pwsh: |
             npm install
-            npm install -g gulp --globalconfig $(Build.SourcesDirectory)/.npmrc
           displayName: 'Install tools'
         - pwsh: npm run compile
           displayName: 'Compile'
@@ -87,7 +86,7 @@ extends:
             LclPackageId: 'LCL-JUNO-PROD-VSCODECS'
         - pwsh: npm run l10nDevImportXlf
           displayName: 'Import xlf to json.'
-        - pwsh: gulp 'publish localization content' --userName dotnet-bot --email dotnet-bot@dotnetfoundation.org --commitSha $(Build.SourceVersion) --targetRemoteRepo vscode-csharp --baseBranch 'main'
+        - pwsh: npm run publishLocalizationContent -- --userName dotnet-bot --email dotnet-bot@dotnetfoundation.org --commitSha $(Build.SourceVersion) --targetRemoteRepo vscode-csharp --baseBranch 'main'
           displayName: 'Create PR in GitHub.'
           env:
             GitHubPAT: $(BotAccount-dotnet-bot-repo-PAT)

azure-pipelines/prereqs.yml

@@ -20,7 +20,7 @@ steps:
     inputs:
       useGlobalJson: true
       workingDirectory: $(Build.SourcesDirectory)/msbuild
-      
+
 
 - script: dotnet --info
   displayName: Display dotnet info
@@ -40,5 +40,4 @@ steps:
 
 - script: |
     npm ci
-    npm i -g gulp
   displayName: 'Install dependencies'

azure-pipelines/publish-roslyn-copilot.yml

@@ -64,12 +64,11 @@ extends:
             storage: "$(AzStorage)"
             ContainerName: "$(AzContainerName)"
 
-        - pwsh: | 
+        - pwsh: |
             npm install
-            npm install -g gulp
           displayName: 'Install tools'
 
-        - pwsh: gulp 'publish roslyn copilot' --userName dotnet-maestro-bot --email dotnet-maestro-bot@microsoft.com --stagingDirectory '$(Build.ArtifactStagingDirectory)/staging'
+        - pwsh: npm run publishRoslynCopilot -- --userName dotnet-maestro-bot --email dotnet-maestro-bot@microsoft.com --stagingDirectory '$(Build.ArtifactStagingDirectory)/staging'
           displayName: 'Create component update PR'
           env:
             GitHubPAT: $(BotAccount-dotnet-maestro-bot-PAT)

azure-pipelines/release.yml

@@ -54,7 +54,7 @@ extends:
               - pwsh: |
                   $artifactVersion = '$(resources.pipeline.officialBuildCI.runName)'
                   $artifactBranchName = '$(resources.pipeline.officialBuildCI.sourceBranch)' -replace 'refs/heads/',''
-                  
+
                   # Set the BuildNumber in the form `# Publish prerelease v2.69.22 #` to improve readability in AzDO
                   $buildNumberName = "Publish $artifactBranchName $artifactVersion"
                   if ('${{ parameters.test }}' -eq 'true') {
@@ -164,12 +164,10 @@ extends:
         - pwsh: |
             npm ci
             npm install
-            npm install -g gulp
-            gulp installDependencies
           displayName: 'Install dependencies.'
         - pwsh: |
             # build number is generated by nerdbank git versioning and set to AzureDev
-            gulp createTags --releaseVersion $(resources.pipeline.officialBuildCI.runName) --releaseCommit $(resources.pipeline.officialBuildCI.sourceCommit) --dryRun ${{ parameters.test }} --prerelease $(isPrerelease)
+            npm run createTags -- --releaseVersion $(resources.pipeline.officialBuildCI.runName) --releaseCommit $(resources.pipeline.officialBuildCI.sourceCommit) --dryRun ${{ parameters.test }} --prerelease $(isPrerelease)
           env:
             GitHubPAT: $(BotAccount-dotnet-bot-content-rw-grained-pat)
           displayName: 'Create release tags'

azure-pipelines/test-prereqs.yml

@@ -1,9 +1,5 @@
 steps:
 
-# We need to download the roslyn language server for the current platform to run integration tests against it.
-- script: gulp installDependencies
-  displayName: 'Install Roslyn Language Server'
-
 - script: /usr/bin/Xvfb :99 -screen 0 1024x768x24 > /dev/null 2>&1 &
   displayName: 'Activate screen emulation'
   condition: eq(variables['Agent.OS'], 'Linux')