Merge branch 'anuraghazra-master'

src/fetchers/top-languages-fetcher.js

@@ -39,8 +39,14 @@ const fetcher = (variables, token) => {
   );
 };
 
+/**
+ * @param {string} username
+ * @param {string[]} ownerAffiliations
+ * @param {string[]} exclude_repo
+ * @returns {Promise<import("./types").TopLangData>}
+ */
 async function fetchTopLanguages(username, ownerAffiliations, exclude_repo = []) {
-  if (!username) throw Error("Invalid username");
+  if (!username) throw new MissingParamError(["username"]);
 
   // Set default value for ownerAffiliations in GraphQL query won't work because
   // parseArray() will always return an empty array even nothing was specified