diff --git a/.gitignore b/.gitignore
index e920c16..c78f780 100644
--- a/.gitignore
+++ b/.gitignore
@@ -31,3 +31,6 @@ node_modules
 
 # Optional REPL history
 .node_repl_history
+
+# Typescript output
+dist/
diff --git a/index.js b/index.js
deleted file mode 100644
index 7217e44..0000000
--- a/index.js
+++ /dev/null
@@ -1,16 +0,0 @@
-var eightStrings = [
-   "viii",
-   "eight",
-   "вісім",
-   "ocho",
-];
-
-var inArray = function(value, array) {
-   return array.indexOf(value) > -1;
-}
-
-var eight = function(value) {
-   return (value == 8) || ((typeof value === "string") && inArray(value.toLowerCase(), eightStrings));
-}
-
-module.exports = eight;
diff --git a/package.json b/package.json
index 315d207..9228c18 100644
--- a/package.json
+++ b/package.json
@@ -2,9 +2,11 @@
   "name": "is-eight",
   "version": "8.0.18",
   "description": "Checks if a number is equal to 8",
-  "main": "index.js",
+  "main": "dist/index.js",
   "scripts": {
-    "test": "mocha --reporter list"
+    "test": "mocha --reporter list",
+    "build": "tsc",
+    "prepublishOnly": "tsc"
   },
   "repository": {
     "type": "git",
@@ -19,6 +21,8 @@
   "author": "ua2004",
   "license": "WTFPL",
   "devDependencies": {
-    "mocha": "^2.4.5"
+    "@types/node": "^12.12.35",
+    "mocha": "^2.4.5",
+    "typescript": "^3.8.3"
   }
 }
diff --git a/src/index.ts b/src/index.ts
new file mode 100644
index 0000000..4cc3242
--- /dev/null
+++ b/src/index.ts
@@ -0,0 +1,13 @@
+const eightStrings:string[] = [
+   "viii",
+   "eight",
+   "вісім",
+   "ocho",
+];
+
+const isEight = (value: number|string): boolean => {
+  if (value == 8) return true;
+  return(typeof value === 'string' && eightStrings.indexOf(value.toLowerCase())!==-1); 
+}
+
+module.exports = isEight;
diff --git a/test/is-eight-test.js b/test/is-eight-test.js
index c94ebc7..a3a6fc6 100644
--- a/test/is-eight-test.js
+++ b/test/is-eight-test.js
@@ -1,4 +1,4 @@
-var eight = require('../index.js');
+var eight = require('../');
 var assert = require("assert");
 
 describe('The is-eight package', function() {
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 0000000..7e4ae7e
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,28 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "esModuleInterop": true,
+        "target": "es5",
+
+        "strict": true,
+        "noFallthroughCasesInSwitch": true,
+        "experimentalDecorators": true,
+
+        "moduleResolution": "node",
+        "sourceMap": true,
+        "outDir": "dist",
+        "baseUrl": ".",
+        "paths": {
+            "*": [
+                "src/types/*"
+            ]
+        },
+        "lib": [
+          "ES5"
+        ],
+        "declaration": true
+    },
+    "include": [
+        "src/**/*"
+    ]
+}