Detect package name mismatch (#7604)

* Detect package name mismatch

* Add test project

* Update warning message

* Add changelog

* Fix rewatch tests

* Revert test

* Revert snapshots

---------

Co-authored-by: Christoph Knittel <ck@cca.io>

Author: nojaf

CHANGELOG.md

@@ -20,6 +20,10 @@
 
 - Remove uncurried handling from rewatch. https://github.com/rescript-lang/rescript/pull/7625
 
+#### :nail_care: Polish
+
+- Add a warning if the name in package.json does not match the name in rescript.json. https://github.com/rescript-lang/rescript/pull/7604
+
 # 12.0.0-alpha.15
 
 #### :boom: Breaking Change

rewatch/src/build/packages.rs

@@ -427,6 +427,17 @@ fn make_package(config: config::Config, package_path: &Path, is_pinned_dep: bool
     };
 
     let package_name = read_package_name(package_path).expect("Could not read package name");
+    if package_name != config.name {
+        log::warn!(
+            "\nPackage name mismatch for {}:\n\
+The package.json name is \"{}\", while the rescript.json name is \"{}\"\n\
+This inconsistency will cause issues with package resolution.\n",
+            package_path.to_string_lossy(),
+            package_name,
+            config.name,
+        );
+    }
+
     Package {
         name: package_name,
         config: config.to_owned(),