fix: publish script — handle NPM errors correctly

Author: stainless-app[bot]

bin/publish-npm

@@ -7,15 +7,35 @@ npm config set '//registry.npmjs.org/:_authToken' "$NPM_TOKEN"
 yarn build
 cd dist
 
+# Get package name and version from package.json
+PACKAGE_NAME="$(jq -r -e '.name' ./package.json)"
+VERSION="$(jq -r -e '.version' ./package.json)"
+
 # Get latest version from npm
 #
-# If the package doesn't exist, yarn will return
-# {"type":"error","data":"Received invalid response from npm."}
-# where .data.version doesn't exist so LAST_VERSION will be an empty string.
-LAST_VERSION="$(yarn info --json 2> /dev/null | jq -r '.data.version')"
-
-# Get current version from package.json
-VERSION="$(node -p "require('./package.json').version")"
+# If the package doesn't exist, npm will return:
+# {
+#   "error": {
+#     "code": "E404",
+#     "summary": "Unpublished on 2025-06-05T09:54:53.528Z",
+#     "detail": "'the_package' is not in this registry..."
+#   }
+# }
+NPM_INFO="$(npm view "$PACKAGE_NAME" version --json 2>/dev/null || true)"
+
+# Check if we got an E404 error
+if echo "$NPM_INFO" | jq -e '.error.code == "E404"' > /dev/null 2>&1; then
+  # Package doesn't exist yet, no last version
+  LAST_VERSION=""
+elif echo "$NPM_INFO" | jq -e '.error' > /dev/null 2>&1; then
+  # Report other errors
+  echo "ERROR: npm returned unexpected data:"
+  echo "$NPM_INFO"
+  exit 1
+else
+  # Success - get the version
+  LAST_VERSION=$(echo "$NPM_INFO" | jq -r '.') # strip quotes
+fi
 
 # Check if current version is pre-release (e.g. alpha / beta / rc)
 CURRENT_IS_PRERELEASE=false