Add compile-copilot-extension-full-build task for copilot

[insilications]

Summary

Adds a new compile-copilot-extension-full-build gulp task that builds the built-in copilot extension from source with correctly filtered node_modules, producing output equivalent to what CI ships from the pre-built VSIX. This also materializes native dependency shims (node-pty, ripgrep) into the extension output.

Motivation

The compile-copilot-extension-build task introduced in #309079 enables building the copilot extension from source for local (non-CI) builds. However, it produces a bloated node_modules directory containing every production dependency from extensions/copilot/package.json, even though nearly all of them are already bundled into dist/extension.js by esbuild. This is bloated for the purpose of daily driving a bleeding-edge with the latest Copilot from source via, for example, --extensionDevelopmentPath.

This happens because packageCopilotExtensionStream merges two streams:

1. fromLocalEsbuild — runs .esbuild.ts, then calls vsce.listFiles({ packageManager: PackageManager.None }). PackageManager.None skips dependency scanning, so .vscodeignore filtering is not applied to node_modules.
2. getProductionDependencies('extensions/copilot') — runs npm ls --all --omit=dev and blindly globs every resolved dependency path into the output.

In CI this is not a problem because packageCopilotExtensionStream is never used — CI downloads a pre-built .vsix (via downloadCopilotVsix.ts) that was packaged by vsce package with PackageManager.Npm, which respects .vscodeignore and only includes the @vscode/copilot-typescript-server-plugin and @github/copilot (SDK subtree) dependencies.

What this PR does

build/lib/extensions.ts

• packageCopilotExtensionFullStream() — A new packaging function that:

  • Runs .esbuild.ts to compile the extension (same as existing)
  • Uses vsce.listFiles({ packageManager: PackageManager.Npm }) instead of PackageManager.None, so .vscodeignore is applied to both source files and node_modules dependencies
  • Cleans package.json (removes scripts, dependencies, devDependencies)

• prepareCopilotExtensionNativeShims(outputDir) — Calls prepareBuiltInCopilotExtensionShims from build/lib/copilot.ts to materialize node-pty and ripgrep binaries into the copilot SDK's expected locations, using the root node_modules/ as the source. Failures are logged as warnings since the extension can create shims at runtime.

build/gulpfile.extensions.ts

• compile-copilot-extension-full-build — A new gulp task that runs three steps in series:
  1. clean-copilot-build — removes .build/extensions/copilot/
  2. package-copilot-extension-full — runs packageCopilotExtensionFullStream and writes to .build/
  3. copilot-extension-native-shims — runs prepareCopilotExtensionNativeShims on the output

Usage

# Build the copilot extension with correct dependency filtering + native shims
npm run gulp compile-copilot-extension-full-build

# Output is at .build/extensions/copilot/

Comparison

compile-copilot-extension-build:

.build/extensions/copilot/node_modules/
├── @anthropic-ai/
├── @github/
├── @vscode/
├── isbinaryfile/
├── minimatch/
├── ... (hundreds of bundled-at-build-time dependencies)

compile-copilot-extension-full-build:

.build/extensions/copilot/node_modules/
├── @github/
│   └── copilot/
│       ├── package.json
│       ├── sdk/
│       │   ├── *.js
│       │   ├── prebuilds/linux-x64/   ← node-pty shims
│       │   ├── ripgrep/bin/linux-x64/ ← ripgrep shims
│       │   └── definitions/*.yaml
│       └── shims.txt                  ← marker file
└── @vscode/
    └── copilot-typescript-server-plugin/
        ├── package.json
        └── dist/*.js

This matches the structure of the copilot extension in released VS Code Insiders builds.

Notes

• The existing compile-copilot-extension-build task and packageCopilotExtensionStream are left unchanged — this PR is purely additive.

Fixes #310156

cc @joaomoreno

[Copilot]

Pull request overview

Adds a new build pipeline for packaging the built-in Copilot extension from source in a VSIX-equivalent way (correct .vscodeignore-based dependency filtering), and optionally materializes native shims into the packaged output to match what CI ships.

Changes:

• Add packageCopilotExtensionFullStream() to package extensions/copilot using vsce.listFiles with PackageManager.Npm (respects .vscodeignore) plus .moduleignore cleanup and package.json stripping.
• Add prepareCopilotExtensionNativeShims(outputDir) to materialize node-pty and ripgrep shims into the packaged Copilot SDK layout (warning-only on failure for local builds).
• Add gulp task compile-copilot-extension-full-build to clean, package, and then generate shims into .build/extensions/copilot/.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
build/lib/extensions.ts	Implements VSIX-equivalent Copilot packaging stream and a helper to materialize native shims into the packaged output.
build/gulpfile.extensions.ts	Introduces compile-copilot-extension-full-build task wiring (clean → package → shims) targeting .build/extensions/copilot/.