Set exports field

CHANGELOG.md

@@ -9,6 +9,14 @@ and this project adheres to
 ## [Unreleased]
 
 - Migrate from @cosmology/telescope to @hyperweb/telescope.
+- Set `exports` field in `package.json`. This disallows importing paths with are
+  not explicitly exported. In case you used the import style with file
+  extension, you need to convert to the extension-less style:
+
+  ```diff
+  -import { TxRaw } from "cosmjs-types/cosmos/tx/v1beta1/tx.js"
+  +import { TxRaw } from "cosmjs-types/cosmos/tx/v1beta1/tx"
+  ```
 
 ## [0.10.1] - 2025-07-29
 

package.json

@@ -15,6 +15,15 @@
   "publishConfig": {
     "access": "public"
   },
+  "exports": {
+    ".": {
+      "types": "./index.d.ts"
+    },
+    "./*": {
+      "types": "./*.d.ts",
+      "default": "./*.js"
+    }
+  },
   "files": [
     "cosmos/",
     "cosmos_proto/",
@@ -40,8 +49,7 @@
     "prepare-publishing": "./scripts/prepare-publishing.sh",
     "build": "rm -rf ./build && tsc && npm run prepare-publishing"
   },
-  "dependencies": {
-  },
+  "dependencies": {},
   "devDependencies": {
     "@hyperweb/telescope": "^1.17.4",
     "@types/node": "^15.6.2",