diff --git a/src/createCatalog.ts b/src/createCatalog.ts
index 25dd9e1..64ef333 100644
--- a/src/createCatalog.ts
+++ b/src/createCatalog.ts
@@ -4,8 +4,8 @@ export function createCatalog(
   catalogs: any,
   components: any,
   terms: any,
-  title: string,
-  lang: string
+  title: any,
+  lang: any
 ): any {
   return {
     title: title,
@@ -31,17 +31,16 @@ function getComponents(components: any): any {
 
 function getChapters(catalogs: any): any {
   let chapters: string[] = [];
-  for(var index in catalogs)  { 
+  for(const index in catalogs)  { 
     if (!validateCatalogDataFiles(catalogs[index])) return;
     chapters = chapters.concat(catalogs[index].chapters);
-    // console.dir(catalogs[index].chapters);
   }
   return chapters;
 }
 
 function getStandards(catalogs: any): any {
   let standard: string[] = [];
-  for(var index in catalogs)  { 
+  for(const index in catalogs)  { 
     if (!validateCatalogDataFiles(catalogs[index])) return;
     standard = standard.concat(catalogs[index].standard);
   }
diff --git a/src/librarian.ts b/src/librarian.ts
index d125e31..f91e9e0 100644
--- a/src/librarian.ts
+++ b/src/librarian.ts
@@ -32,25 +32,25 @@ if (argv.catalog) {
   const catalog = argv.catalog;
 
   // Load data files.
-  let wcag20 = yaml.load(
+  const wcag20 = yaml.load(
     fs.readFileSync("./catalog/data/wcag-2.0.yaml").toString()
   );
-  let wcag21 = yaml.load(
+  const wcag21 = yaml.load(
     fs.readFileSync("./catalog/data/wcag-2.1.yaml").toString()
   );
-  let wcag22 = yaml.load(
+  const wcag22 = yaml.load(
     fs.readFileSync("./catalog/data/wcag-2.2.yaml").toString()
   );
-  let section508 = yaml.load(
+  const section508 = yaml.load(
     fs.readFileSync("./catalog/data/508.yaml").toString()
   );
-  let en301549 = yaml.load(
+  const en301549 = yaml.load(
     fs.readFileSync("./catalog/data/en-301-549.yaml").toString()
   );
-  let components = yaml.load(
+  const components = yaml.load(
     fs.readFileSync("./catalog/data/components.yaml").toString()
   );
-  let terms = yaml.load(
+  const terms = yaml.load(
     fs.readFileSync("./catalog/data/terms.yaml").toString()
   );