feat: Add git commit hash tracking to server build

- Inject git commit SHA via build-time ldflags
- Add X-Git-Commit and X-Server-Version response headers
- Update typescript-go API compatibility for latest version
- Add Chtimes method for vfs.VFS interface compliance

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: zshannon

.github/workflows/deploy-server.yml

@@ -44,4 +44,5 @@ jobs:
           flyctl deploy --remote-only \
             --config server/fly.toml \
             --dockerfile server/Dockerfile \
-            --build-arg BUILDKIT_INLINE_CACHE=1
+            --build-arg BUILDKIT_INLINE_CACHE=1 \
+            --build-arg GIT_COMMIT=${{ github.sha }}

server/Dockerfile

@@ -1,5 +1,8 @@
 FROM --platform=linux/x86_64 golang:1.24-bookworm AS build
 
+# Accept git commit as build argument
+ARG GIT_COMMIT=unknown
+
 WORKDIR /workspace
 
 # Copy only what's needed for the Go module
@@ -15,7 +18,7 @@ RUN set -xe; \
     go build \
     -mod=readonly \
     -buildmode=pie \
-    -ldflags "-linkmode external -extldflags -static-pie" \
+    -ldflags "-linkmode external -extldflags -static-pie -X main.gitCommit=${GIT_COMMIT}" \
     -tags netgo \
     -o /server .
 

server/server.go

@@ -25,17 +25,17 @@ import (
 	lru "github.com/hashicorp/golang-lru/v2"
 	"github.com/microsoft/typescript-go/internal/ast"
 	"github.com/microsoft/typescript-go/internal/bundled"
-	"github.com/microsoft/typescript-go/internal/collections"
 	"github.com/microsoft/typescript-go/internal/compiler"
 	"github.com/microsoft/typescript-go/internal/core"
+	"github.com/microsoft/typescript-go/internal/execute/tsc"
 	"github.com/microsoft/typescript-go/internal/tsoptions"
-	"github.com/microsoft/typescript-go/internal/tspath"
 	"github.com/microsoft/typescript-go/internal/vfs"
 )
 
 var (
 	serverVersion = "1.0.0"
 	startTime     = time.Now()
+	gitCommit     = "unknown" // Set at build time with -ldflags
 
 	// S3 client and configuration
 	s3Client    *s3.Client
@@ -631,6 +631,12 @@ func (fs *s3FS) Remove(path string) error {
 	return nil
 }
 
+func (fs *s3FS) Chtimes(path string, aTime time.Time, mTime time.Time) error {
+	// S3-backed file system doesn't support changing file times
+	// This is a no-op implementation for compatibility
+	return nil
+}
+
 func (fs *s3FS) DirectoryExists(path string) bool {
 	if path == "/" || path == "" {
 		return true
@@ -726,10 +732,10 @@ func typecheckTypeScript(code string, version string) TypecheckResponse {
 	}
 
 	// Create cache
-	extendedConfigCache := &collections.SyncMap[tspath.Path, *tsoptions.ExtendedConfigCacheEntry]{}
+	extendedConfigCache := &tsc.ExtendedConfigCache{}
 
 	// Create host
-	host := compiler.NewCachedFSCompilerHost("/", wrappedFS, bundled.LibPath(), extendedConfigCache)
+	host := compiler.NewCachedFSCompilerHost("/", wrappedFS, bundled.LibPath(), extendedConfigCache, nil)
 
 	// Create program
 	program := compiler.NewProgram(compiler.ProgramOptions{
@@ -981,6 +987,10 @@ func loggingMiddleware(next http.HandlerFunc) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
 		start := time.Now()
 
+		// Add git commit header to all responses
+		w.Header().Set("X-Git-Commit", gitCommit)
+		w.Header().Set("X-Server-Version", serverVersion)
+		
 		// Create a custom response writer to capture status code
 		lrw := &loggingResponseWriter{ResponseWriter: w, statusCode: http.StatusOK}