perf: optimize EAS build caching and Metro bundling

Improves build performance by adding platform-specific cache paths including Gradle and iOS Pods directories. Updates cache keys to use app.config.js instead of package.json for more accurate invalidation.

Enhances Metro minification with Hermes-optimized settings, adds ASCII-only output, and enables advanced compression optimizations like dead code elimination and variable reduction.

Configures production environment variables for bundle size optimization across preview and production builds.

eas.json

@@ -6,8 +6,14 @@
     "development": {
       "resourceClass": "medium",
       "cache": {
-        "key": "development-{{ checksum \"bun.lock\" \"package.json\" }}",
-        "paths": ["~/.bun/install/cache", "node_modules", ".expo"]
+        "key": "dev-{{ checksum \"bun.lock\" \"app.config.js\" }}",
+        "paths": [
+          "~/.bun/install/cache",
+          "node_modules",
+          ".expo",
+          "android/.gradle",
+          "ios/Pods"
+        ]
       },
       "environment": "development",
       "developmentClient": true,
@@ -55,19 +61,34 @@
     "preview": {
       "resourceClass": "large",
       "cache": {
-        "key": "preview-{{ checksum \"bun.lock\" \"package.json\" }}",
-        "paths": ["~/.bun/install/cache", "node_modules", ".expo"]
+        "key": "preview-{{ checksum \"bun.lock\" \"app.config.js\" }}",
+        "paths": [
+          "~/.bun/install/cache",
+          "node_modules",
+          ".expo",
+          "android/.gradle",
+          "ios/Pods",
+          ".next"
+        ]
       },
       "distribution": "internal",
       "env": {
+        "EXPO_OPTIMIZE_BUNDLE_SIZE": "1",
+        "NODE_ENV": "production",
         "EXPO_PUBLIC_WRITE_DEBUG": "1"
       }
     },
     "production": {
       "resourceClass": "large",
       "cache": {
-        "key": "production-{{ checksum \"bun.lock\" \"package.json\" }}",
-        "paths": ["~/.bun/install/cache", "node_modules", ".expo"]
+        "key": "production-{{ checksum \"bun.lock\" \"app.config.js\" }}",
+        "paths": [
+          "~/.bun/install/cache",
+          "node_modules",
+          ".expo",
+          "android/.gradle",
+          "ios/Pods"
+        ]
       },
       "environment": "production",
       "channel": "0.36.0",
@@ -77,6 +98,10 @@
       },
       "ios": {
         "image": "latest"
+      },
+      "env": {
+        "EXPO_OPTIMIZE_BUNDLE_SIZE": "1",
+        "NODE_ENV": "production"
       }
     },
     "production-apk": {

metro.config.js

@@ -29,22 +29,28 @@ config.transformer = {
   // NEW: Inline requires for 15-30% startup improvement
   inlineRequires: true,
 
-  // NEW: Minification optimized for streaming apps
+  // ADVANCED: Hermes-optimized minification for streaming apps
   minifierConfig: {
-    // Keep function names in dev for better debugging
-    keep_fnames: process.env.NODE_ENV === "development",
     mangle: {
       keep_fnames: process.env.NODE_ENV === "development",
-      // Optimize for Hermes bytecode
-      properties: false, // Safer for dynamic property access in streaming
     },
-    // Compress optimized for media apps
+    output: {
+      ascii_only: true,
+      beautify: false,
+      semicolons: false,
+    },
     compress: {
-      // Remove console logs in production
+      // Production-only optimizations
       drop_console: process.env.NODE_ENV === "production",
+      dead_code: true,
+      drop_debugger: true,
+      conditionals: true,
+      evaluate: true,
+      unused: true,
+      reduce_vars: true,
       // Keep class names for error reporting
       keep_classnames: true,
-      // Preserve function names for performance profiling
+      // Preserve function names for performance profiling in dev
       keep_fnames: process.env.NODE_ENV === "development",
     },
   },