Rename helper library to get-error-message

packages/get-error-message/index.js

@@ -0,0 +1,16 @@
+/**
+ *
+ * @param {unknown} error The error object to check.
+ * @returns {error is Error}
+ */
+export const isError = (error) => error instanceof Error;
+
+/**
+ * Get the error message from an error object or return a default message.
+ * @param {unknown} error The error object to check.
+ * @param {string} defaultMessage The default message to return if the error is not an instance of Error.
+ * @returns {string} The error message or the default message.
+ */
+export const getErrorMessage = (error, defaultMessage) => {
+  return isError(error) ? error.message : defaultMessage;
+};