diff --git a/src/constants.js b/src/constants.ts
similarity index 99%
rename from src/constants.js
rename to src/constants.ts
index 7a714e907..2a52b4697 100644
--- a/src/constants.js
+++ b/src/constants.ts
@@ -1,3 +1,4 @@
+// @ts-nocheck
 import Utils from './utils/util';
 
 /**
diff --git a/src/easypost.js b/src/easypost.ts
similarity index 99%
rename from src/easypost.js
rename to src/easypost.ts
index b86082806..ea35bbdbf 100644
--- a/src/easypost.js
+++ b/src/easypost.ts
@@ -1,3 +1,4 @@
+// @ts-nocheck
 import util from 'util';
 import { v4 as uuid } from 'uuid';
 
diff --git a/src/utils/internal_util.js b/src/utils/internal_util.ts
similarity index 93%
rename from src/utils/internal_util.js
rename to src/utils/internal_util.ts
index 99385e7d2..09f27f487 100644
--- a/src/utils/internal_util.js
+++ b/src/utils/internal_util.ts
@@ -1,3 +1,4 @@
+// @ts-nocheck
 /**
  * Utility class of various internal helper functions.
  * This class is not designed to be used directly by consumers of the library.
diff --git a/src/utils/util.js b/src/utils/util.ts
similarity index 99%
rename from src/utils/util.js
rename to src/utils/util.ts
index ab26d7804..6c6be45a2 100644
--- a/src/utils/util.js
+++ b/src/utils/util.ts
@@ -1,3 +1,4 @@
+// @ts-nocheck
 import crypto from 'crypto';
 import util from 'util';
 
diff --git a/tsconfig.build.json b/tsconfig.build.json
index e301a68b4..f4bfc21ac 100644
--- a/tsconfig.build.json
+++ b/tsconfig.build.json
@@ -3,6 +3,7 @@
   "compilerOptions": {
     "allowJs": true,
     "checkJs": false,
+    "noImplicitAny": false,
     "declaration": true,
     "noEmit": true
   },
diff --git a/vite.config.js b/vite.config.js
index 901662487..653e064df 100644
--- a/vite.config.js
+++ b/vite.config.js
@@ -10,7 +10,7 @@ export default defineConfig({
     // drop node 12 support in the future, change this to the next min version
     target: 'node12',
     lib: {
-      entry: path.resolve(__dirname, 'src/easypost.js'),
+      entry: path.resolve(__dirname, 'src/easypost.ts'),
       fileName: 'easypost',
     },
     sourcemap: isDev,
@@ -32,7 +32,7 @@ export default defineConfig({
   },
 
   resolve: {
-    extensions: ['.js'],
+    extensions: ['.ts', '.js'],
     alias: {
       '@': path.resolve(__dirname, 'src'),
     },