Use rewatch in test helper

Author: nojaf

lib_dev/process.js

@@ -160,7 +160,7 @@ export function setup(cwd = process.cwd()) {
     rescript(command, args = [], options = {}) {
       const cliPath = path.join(
         import.meta.dirname,
-        "../cli/rescript-legacy.js",
+        "../cli/rescript.js",
       );
       return exec("node", [cliPath, command, ...args].filter(Boolean), options);
     },

tests/docstring_tests/package.json

@@ -3,7 +3,7 @@
   "type": "module",
   "private": true,
   "scripts": {
-    "build": "rescript legacy build",
+    "build": "rescript build",
     "clean": "rescript clean",
     "dev": "rescript -w"
   },