Merge pull request Expensify#67373 from ikevin127/ikevin127-devHeapCrashAutoRestart

[NoQA] Add `webpack-dev-server` GC plugin & script for auto-restart on crash

Author: roryabraham

config/webpack/ForceGarbageCollectionPlugin.ts

@@ -0,0 +1,41 @@
+/* eslint-disable no-console */
+import type {Compiler} from 'webpack';
+
+/**
+ * Custom webpack plugin that forces garbage collection every 5 compilations
+ * and logs memory usage to help monitor memory consumption during development.
+ *
+ * Note: Requires Node.js to be started with --expose-gc flag to enable garbage collection.
+ */
+class ForceGarbageCollectionPlugin {
+    private compilationCount = 0;
+
+    apply(compiler: Compiler) {
+        if (gc && typeof gc === 'function') {
+            compiler.hooks.done.tap(this.constructor.name, () => {
+                this.compilationCount++;
+
+                // Log memory usage every compilation
+                const memUsage = process.memoryUsage();
+                const heapUsedMB = Math.round(memUsage.heapUsed / 1024 / 1024);
+                const heapTotalMB = Math.round(memUsage.heapTotal / 1024 / 1024);
+
+                console.log(`📊 Compilation #${this.compilationCount} - Heap: ${heapUsedMB}MB/${heapTotalMB}MB`);
+                if (this.compilationCount % 5 === 0) {
+                    console.log(`🗑️ Forcing garbage collection after ${this.compilationCount} compilations`);
+                    // @ts-expect-error - gc is a global function provided when Node.js is started with --expose-gc flag
+                    gc();
+
+                    // Log memory after garbage collection
+                    const memAfterGC = process.memoryUsage();
+                    const heapAfterMB = Math.round(memAfterGC.heapUsed / 1024 / 1024);
+                    console.log(`✅ Post-GC heap size: ${heapAfterMB}MB (freed ${heapUsedMB - heapAfterMB}MB)`);
+                }
+            });
+        } else {
+            console.warn('⚠️ ForceGarbageCollectionPlugin: gc() function not available. Start Node.js with --expose-gc flag to enable garbage collection.');
+        }
+    }
+}
+
+export default ForceGarbageCollectionPlugin;