build: minify client-side js on prod

esbuild.mjs

@@ -3,7 +3,11 @@
 
 import { build } from "esbuild";
 import glob from "fast-glob";
+import dotenv from "dotenv";
 
+dotenv.config();
+
+const isProdEnv = process.env.PROD === "true";
 const entryPoints = await glob("./src/client/src/ts/**/*");
 
 build({
@@ -12,7 +16,8 @@ build({
     bundle: true,
     target: ["es6"],
     format: "iife",
-    sourcemap: false,
     loader: {".ts": "ts"},
-    minify: false
+    sourcemap: !isProdEnv,
+    minify: isProdEnv,
+    keepNames: !isProdEnv
 }).catch(() => process.exit(1));