When using the icu package in a TypeScript project, I encountered an error Typescript Could not find a declaration file for module 'icu'..

This seems to be because there is no explicit export for the type definitions corresponding to ./lib/index.mjs in ffi/npm/package.json. Specifically, the package currently does not export ./lib/index.d.ts.

After making the following changes to package.json, TypeScript is able to correctly resolve the type definitions for the icu package:

  "exports": {
-    ".": "./lib/index.mjs"
+    ".": {
+      "import": "./lib/index.mjs",
+      "types": "./lib/index.d.ts"
     }
  },

Alternatively, renaming ./lib/index.d.ts to ./lib/index.d.mts also resolves the issue, since TypeScript enforces stricter rules for automatic type resolution with mjs files.
However, the contents of the lib directory are generated by Diplomat, and I couldn’t find an option in Diplomat to change the file extension for generated type definitions.

BTW, I noticed that version 2.0.4 of icu has been published on npm, but ffi/README.md does not appear to be updated yet.

Although this is a fairly simple change, I would be happy to open a Pull Request to help address this issue—just let me know if that would be helpful!