diff --git a/.eslintrc b/.eslintrc
new file mode 100644
index 0000000..03d973a
--- /dev/null
+++ b/.eslintrc
@@ -0,0 +1,45 @@
+{
+    "rules": {
+        "indent": [2, 4],
+        "quotes": [2, "single"],
+        "linebreak-style": [2, "unix"],
+        "semi": [2, "always"],
+        "brace-style": 2,
+        "camelcase": [2, { "properties": "always" }],
+        "no-var": 2,
+        "no-const-assign": 2,
+        "arrow-parens": [2, "always"],
+        "arrow-spacing": 2,
+        "space-before-function-paren": [2, "never"],
+        "no-spaced-func": 2,
+        "prefer-template": 2,
+        "prefer-const": 1,
+        "no-this-before-super": 2,
+        "comma-spacing": [2, { "before": false, "after": true }],
+        "comma-dangle": [1, "always-multiline"],
+        "no-dupe-keys": 2,
+        "no-debugger": 2,
+        "no-unreachable": 2,
+        "valid-jsdoc": 2,
+        "require-jsdoc": 1,
+        "space-before-blocks": 2,
+        "space-infix-ops": 2,
+        "keyword-spacing": 2,
+        "no-trailing-spaces": 2,
+        "max-len": [2, 80, 4, { "ignoreUrls": true, "ignorePattern": "^\\s*const\\s.+=\\s*require\\s*\\(" }],
+        "guard-for-in": 2,
+        "no-alert": 2,
+        "no-throw-literal": 2,
+        "object-curly-spacing": [2, "never"],
+        "no-array-constructor": 2,
+        "no-new-object": 2,
+        "no-console": 2,
+        "one-var": [2, "never"]
+    },
+    "env": {
+        "es6": true,
+        "node": true
+    },
+    "extends": "eslint:recommended",
+    "root": true
+}
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..1f033ba
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+package-lock.json
+node_modules
+KhanAcademyLibs/math-translator.js
diff --git a/options.html b/options.html
index 5fc7662..b5f0970 100644
--- a/options.html
+++ b/options.html
@@ -81,6 +81,8 @@ <h3>Please select your language</h3>
     <li>Thousand separator</li>
     <li>Multiplication</li>
     <li>Division</li>
+    <li>Trigonometry functions</li>
+    <li>Coordinates and intervals</li>
   </ul>
 </div>
 
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..3762262
--- /dev/null
+++ b/package.json
@@ -0,0 +1,26 @@
+{
+  "name": "khan-academy-dots",
+  "description": "Translate math notation in Khan Academy Crowdin strings.",
+  "author": "Daniel Hollas & Szymon Bubak & Krzysztof Krystek & Robert Pala",
+  "version": "3.3.0",
+  "main": "app.js",
+  "scripts": {
+    "lint": "eslint *.js"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com:szmeku/KhanAcademyDots"
+  },
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/szmeku/KhanAcademyDots/issues"
+  },
+  "homepage": "https://github.com/szmeku/KhanAcademyDots",
+  "devDependencies": {
+    "eslint": "^7.10.0",
+    "pre-commit": "^1.2.2"
+  },
+  "pre-commit": [
+    "lint"
+  ]
+}