diff --git a/src/js/lib/Quran.ts b/src/js/lib/Quran.ts
index 9c7ecd26d..db57684ca 100644
--- a/src/js/lib/Quran.ts
+++ b/src/js/lib/Quran.ts
@@ -1,8 +1,8 @@
-import * as JSON from "lib/Quran/JSON";
-import { Surah } from "lib/Quran/Surah";
+import * as JSON from 'lib/Quran/JSON';
+import { Surah } from 'lib/Quran/Surah';
 
 type Locale = 'ar' | 'en';
-type Ayah = {id: number, text: string, readTimeMs: number };
+interface Ayah {id: number, text: string, readTimeMs: number }
 type Ayat = Ayah[];
 
 export { Surah, Ayah, Ayat, Locale, JSON };
diff --git a/src/js/lib/Quran/JSON.ts b/src/js/lib/Quran/JSON.ts
index 48b30c93c..7aa3c40ec 100644
--- a/src/js/lib/Quran/JSON.ts
+++ b/src/js/lib/Quran/JSON.ts
@@ -1,4 +1,4 @@
-type Surah = {
+interface Surah {
   id: string
   place_of_revelation: string
   transliterated_name: string
diff --git a/src/js/lib/i18n.ts b/src/js/lib/i18n.ts
index a0b7928b2..20a8fd019 100644
--- a/src/js/lib/i18n.ts
+++ b/src/js/lib/i18n.ts
@@ -33,7 +33,7 @@ export const DelayPerWord: Record<Locale, number> = {
 
 export function numbers (locale: Locale) {
   return function(number: number): string {
-    return Number(number).toLocaleString(locale)
+    return Number(number).toLocaleString(locale);
   };
 }
 
@@ -45,7 +45,7 @@ export function strings (locale: Locale) {
 }
 
 export function numberToDecimal(number: number, locale: Locale): string {
-  return number.toLocaleString(locale, {maximumFractionDigits: 1})
+  return number.toLocaleString(locale, { maximumFractionDigits: 1 })
                .split(/([^\d])/)
-               .join(" ")
+               .join(' ');
 }