diff --git a/.github/workflows/test-and-deploy.yml b/.github/workflows/test-and-deploy.yml
index cbf1e50..9463212 100644
--- a/.github/workflows/test-and-deploy.yml
+++ b/.github/workflows/test-and-deploy.yml
@@ -19,6 +19,7 @@ jobs:
         with:
           cache: 'npm'
       - run: npm ci
+      - run: npm lint
       - run: npm run build
       - run: npm test
       - uses: actions/upload-artifact@v3
diff --git a/egyptianNumber.ts b/egyptianNumber.ts
index 14dc6c3..80c60a3 100644
--- a/egyptianNumber.ts
+++ b/egyptianNumber.ts
@@ -162,7 +162,7 @@ export class EgyptianNumber {
 
   static addAll(...summands: EgyptianNumber[]): EgyptianNumber {
     let result = new EgyptianNumber(0);
-    summands.forEach((summand, i, array) => {
+    summands.forEach((summand) => {
       result = this.add(result, summand);
     })
     return result;
diff --git a/eslint.config.mjs b/eslint.config.mjs
new file mode 100644
index 0000000..5838c0f
--- /dev/null
+++ b/eslint.config.mjs
@@ -0,0 +1,15 @@
+import eslint from '@eslint/js';
+import tseslint from 'typescript-eslint';
+
+export default tseslint.config(
+  eslint.configs.recommended,
+  ...tseslint.configs.recommended,
+  {
+    ignores: [
+      'bundle.mjs',
+      'build/*',
+      'docs/_build/*',
+      'grammar/seshat/*',
+    ]
+  }
+);
\ No newline at end of file
diff --git a/package.json b/package.json
index e81341b..72f71dc 100644
--- a/package.json
+++ b/package.json
@@ -19,10 +19,14 @@
   },
   "scripts": {
     "antlr4ts": "antlr4ts",
+
     "build": "npm run build-antlr && npm run build-bundle",
     "build-antlr": "antlr4ts ./grammar/seshat/SeshatLexer.g4 && antlr4ts ./grammar/seshat/SeshatParser.g4 -visitor -no-listener",
     "build-bundle": "node bundle.mjs",
+    "lint": "eslint .",
+
     "run-dev-server": "node bundle.mjs --serve",
+
     "test": "npm run test-js & npm run test-seshat",
     "test-js": "node tests/js/*.mjs",
     "test-seshat": "./run-tests.sh"
diff --git a/seshatStandardLibrary.ts b/seshatStandardLibrary.ts
index 7d1e83e..07b89b7 100644
--- a/seshatStandardLibrary.ts
+++ b/seshatStandardLibrary.ts
@@ -1,9 +1,9 @@
 import { EgyptianNumber } from './egyptianNumber';
 
-type seshatVariable = EgyptianNumber | string;
+type SeshatVariable = EgyptianNumber | string;
 
 export function makeSeshatEnvironment(options: {
-  systemPrint: (...args: any) => void,
+  systemPrint: (...args: string[]) => void,
   systemAssert: (expr: boolean) => void,
 }) {
   options = {
@@ -13,7 +13,7 @@ export function makeSeshatEnvironment(options: {
   };
   return {
     EgyptianNumber: EgyptianNumber,
-    print: (...args: Array<any>) => {
+    print: (...args: SeshatVariable[]) => {
       const processedArgs = args.map(item => {
         if (item instanceof EgyptianNumber) {
           return item.toHieroglyphs();
@@ -23,7 +23,7 @@ export function makeSeshatEnvironment(options: {
       })
       options.systemPrint(...processedArgs);
     },
-    assertEqual: (a: seshatVariable, b: seshatVariable) => {
+    assertEqual: (a: SeshatVariable, b: SeshatVariable) => {
       if (a instanceof EgyptianNumber) {
         options.systemAssert((b instanceof EgyptianNumber) && a.isEqualTo(b));
         return;