fix(agent): use tsup watcher for dev mode instead of tsx (fixes #253)

packages/agent/package.json

@@ -3,7 +3,7 @@
   "version": "0.1.0",
   "type": "module",
   "scripts": {
-    "dev": "tsx watch src/index.ts",
+    "dev": "tsup --watch src --onSuccess 'node dist/index.js'",
     "build": "tsc",
     "start": "node dist/index.js",
     "test": "vitest run",
@@ -33,6 +33,7 @@
     "@types/supertest": "^6.0.3",
     "@types/ws": "^8.5.0",
     "supertest": "^7.2.2",
+    "tsup": "^8.3.6",
     "tsx": "^4.19.0",
     "typescript": "^5.7.0",
     "vitest": "^3.0.0"

packages/agent/tsup.config.ts

@@ -0,0 +1,20 @@
+import { defineConfig } from 'tsup'
+
+// Dev/watch build for the agent entrypoint.
+// tsx's ESM loader cannot instantiate @bonfida/spl-name-service@3.0.21's
+// vendored borsh ESM bundle (see #253); building with tsup (esbuild) and
+// running the output with plain `node` avoids that loader entirely.
+export default defineConfig({
+  entry: ['src/index.ts'],
+  format: ['esm'],
+  target: 'node22',
+  dts: false,
+  clean: true,
+  sourcemap: true,
+  splitting: false,
+  // Transpile only the agent's own source; let Node resolve node_modules at
+  // runtime. Bundling the transitive CJS chain (bs58 -> safe-buffer ->
+  // require("buffer")) into a single ESM file breaks with "Dynamic require
+  // not supported". Plain Node handles those deps (and Bonfida's ESM) fine.
+  skipNodeModulesBundle: true,
+})