fix(vite-plugin-metaspatial): ensure GLXF generation runs after component discovery

Summary: Move GLXF generation from buildStart to buildEnd with order: 'post' to fix a race condition where the Meta Spatial CLI was running before component XML files were written to disk. This ensures discoverComponents completes its XML generation before generateGLXF executes, which is required since the CLI depends on those component definitions.

Reviewed By: zjm-meta

Differential Revision:
D90284014

Privacy Context Container: L1334777

fbshipit-source-id: b5e9395881898f5867aaadbeaba3c86be0d29b90

Author: felixtrz

packages/vite-plugin-metaspatial/src/generate-glxf/index.ts

@@ -9,9 +9,9 @@ import * as path from 'path';
 import type { FSWatcher } from 'chokidar';
 import fs from 'fs-extra';
 import type { Plugin, ViteDevServer } from 'vite';
+import { resolveMetaSpatialCliPath } from './cli-path-resolver.js';
 import { regenerateGLXF, createFileWatcher, cleanup } from './file-watcher.js';
 import type { GLXFGenerationOptions, ProcessedGLXFOptions } from './types.js';
-import { resolveMetaSpatialCliPath } from './cli-path-resolver.js';
 
 // Export types
 export type { GLXFGenerationOptions } from './types.js';
@@ -266,28 +266,40 @@ export function generateGLXF(options: GLXFGenerationOptions = {}): Plugin {
       console.log('👁️  GLXF file watcher started - monitoring for changes...');
     },
 
-    async buildStart() {
-      // Only generate GLXF during build, not during dev server
+    buildStart() {
+      // Only reset stats during build, not during dev server
       // config.command is 'serve' for dev, 'build' for production
       if (config.command === 'serve') {
         return;
       }
 
       // Reset stats for each build
       generationStats = [];
-      await generateBuildGLXF(pluginOptions, generationStats);
     },
 
-    buildEnd() {
-      // Clean up watcher when build ends
-      if (watcher) {
-        watcher.close();
-        watcher = null;
-        cleanup(); // Clear any pending debounced operations
-        if (pluginOptions.verbose) {
-          console.log('👋 Meta Spatial file watcher closed');
+    // Use order: 'post' to ensure this runs AFTER discoverComponents.buildEnd()
+    // which writes the component XML files that the Meta Spatial CLI needs
+    buildEnd: {
+      order: 'post',
+      async handler() {
+        // Only generate GLXF during build, not during dev server
+        if (config.command === 'serve') {
+          return;
         }
-      }
+
+        // Generate GLXF files (after component XMLs have been written)
+        await generateBuildGLXF(pluginOptions, generationStats);
+
+        // Clean up watcher when build ends
+        if (watcher) {
+          watcher.close();
+          watcher = null;
+          cleanup(); // Clear any pending debounced operations
+          if (pluginOptions.verbose) {
+            console.log('👋 Meta Spatial file watcher closed');
+          }
+        }
+      },
     },
 
     // Display GLXF generation summary at the very end of build process