[eslint] add eslint

.eslintrc

@@ -0,0 +1,22 @@
+{
+    "root": true,
+
+    "extends": "@ljharb",
+
+    "rules": {
+        "array-bracket-newline": 0,
+        "comma-spacing": 1,
+        "indent": [2, 4],
+        "max-statements-per-line": 1,
+    },
+
+    "overrides": [
+        {
+            "files": "example/**",
+            "rules": {
+                "no-buffer-constructor": 0,
+                "no-console": 0,
+            },
+        },
+    ],
+}

example/eq.js

@@ -1,3 +1,5 @@
+'use strict';
+
 var bufferEqual = require('../');
 
 console.dir(bufferEqual(

index.js

@@ -1,14 +1,15 @@
+'use strict';
+
 var Buffer = require('buffer').Buffer; // for use with browserify
 
 module.exports = function (a, b) {
-    if (!Buffer.isBuffer(a)) return undefined;
-    if (!Buffer.isBuffer(b)) return undefined;
-    if (typeof a.equals === 'function') return a.equals(b);
-    if (a.length !== b.length) return false;
-
+    if (!Buffer.isBuffer(a) || !Buffer.isBuffer(b)) { return undefined; }
+    if (typeof a.equals === 'function') { return a.equals(b); }
+    if (a.length !== b.length) { return false; }
+
     for (var i = 0; i < a.length; i++) {
-        if (a[i] !== b[i]) return false;
+        if (a[i] !== b[i]) { return false; }
     }
-    
+
     return true;
 };

package.json

@@ -16,12 +16,16 @@
         "test": "test"
     },
     "scripts": {
+        "lint": "eslint --ext=js,mjs .",
+        "pretest": "npm run lint",
         "tests-only": "tape 'test/**/*.js'",
         "test": "npm run tests-only",
         "posttest": "aud --production"
     },
     "devDependencies": {
+        "@ljharb/eslint-config": "^21.0.0",
         "aud": "^2.0.1",
+        "eslint": "=8.8.0",
         "tape": "^5.6.1"
     },
     "engines": {