diff --git a/.eslintrc.js b/.eslintrc.js
new file mode 100644
index 0000000..fc3acea
--- /dev/null
+++ b/.eslintrc.js
@@ -0,0 +1,19 @@
+module.exports = {
+  root: true,
+  env: {
+    node: true,
+  },
+  plugins: [
+    '@typescript-eslint',
+  ],
+  extends: [
+    'eslint:recommended',
+    "plugin:react/recommended",
+    'plugin:@typescript-eslint/recommended',
+  ],
+  rules: {
+    "@typescript-eslint/no-explicit-any": "off",
+    "no-console": process.env.NODE_ENV === "production" ? "warn" : "off",
+    "no-debugger": process.env.NODE_ENV === "production" ? "warn" : "off"
+  }
+}
\ No newline at end of file
diff --git a/package.json b/package.json
index 2d60330..d9a663e 100644
--- a/package.json
+++ b/package.json
@@ -23,10 +23,15 @@
     "@types/node": "^16.11.59",
     "@types/react": "^18.0.21",
     "@types/react-dom": "^18.0.6",
+    "@typescript-eslint/eslint-plugin": "^5.40.0",
+    "@typescript-eslint/parser": "^5.40.0",
+    "eslint": "^8.25.0",
+    "eslint-plugin-react": "^7.31.10",
     "gh-pages": "^3.1.0"
   },
   "scripts": {
     "start": "react-scripts start",
+    "prebuild": "eslint \"src/**/*.ts\" -c .eslintrc.js",
     "build": "react-scripts build",
     "test": "react-scripts test",
     "eject": "react-scripts eject",
diff --git a/src/font-face.d.ts b/src/font-face.d.ts
index f4ea744..33d596c 100644
--- a/src/font-face.d.ts
+++ b/src/font-face.d.ts
@@ -13,8 +13,8 @@ declare global {
   type FontFaceLoadStatus = 'unloaded' | 'loading' | 'loaded' | 'error';
   type FontFaceSetStatus = 'loading' | 'loaded';
 
-  interface FontFace extends FontFaceDescriptors {
-    new(family: string, source: string | ArrayBuffer, descriptors?: FontFaceDescriptors): FontFace;
+  class FontFace extends FontFaceDescriptors {
+    constructor(family: string, source: string | ArrayBuffer, descriptors?: FontFaceDescriptors): FontFace;
     readonly status: FontFaceLoadStatus;
     readonly loaded: Promise<FontFace>;
     variationSettings: CSSOMString;
@@ -36,7 +36,7 @@ declare global {
     readonly status: FontFaceSetStatus;
     readonly ready: Promise<FontFaceSet>;
     add(font: FontFace): void;
-    check(font: string, text?: string): Boolean; // throws exception
+    check(font: string, text?: string): boolean; // throws exception
     load(font: string, text?: string): Promise<FontFace[]>
     delete(font: FontFace): void;
     clear(): void;