diff --git a/web/js/worker/sha256-purejs.mjs b/web/js/worker/sha256-purejs.ts
similarity index 97%
rename from web/js/worker/sha256-purejs.mjs
rename to web/js/worker/sha256-purejs.ts
index 3211b44b..69060615 100644
--- a/web/js/worker/sha256-purejs.mjs
+++ b/web/js/worker/sha256-purejs.ts
@@ -6,7 +6,7 @@ const calculateSHA256 = (text) => {
   return hash.digest();
 };
 
-function toHexString(arr) {
+function toHexString(arr: Uint8Array): string {
   return Array.from(arr)
     .map((c) => c.toString(16).padStart(2, "0"))
     .join("");
diff --git a/web/js/worker/sha256-webcrypto.mjs b/web/js/worker/sha256-webcrypto.ts
similarity index 94%
rename from web/js/worker/sha256-webcrypto.mjs
rename to web/js/worker/sha256-webcrypto.ts
index c2b071ab..c83f4665 100644
--- a/web/js/worker/sha256-webcrypto.mjs
+++ b/web/js/worker/sha256-webcrypto.ts
@@ -1,10 +1,11 @@
 const encoder = new TextEncoder();
-const calculateSHA256 = async (input) => {
+
+const calculateSHA256 = async (input: string) => {
   const data = encoder.encode(input);
   return await crypto.subtle.digest("SHA-256", data);
 };
 
-const toHexString = (byteArray) => {
+const toHexString = (byteArray: Uint8Array) => {
   return byteArray.reduce((str, byte) => str + byte.toString(16).padStart(2, "0"), "");
 };