diff --git a/Gruntfile.coffee b/Gruntfile.coffee
deleted file mode 100644
index cc89bac..0000000
--- a/Gruntfile.coffee
+++ /dev/null
@@ -1,41 +0,0 @@
-module.exports = (grunt) ->
-  grunt.initConfig
-    pkg: grunt.file.readJSON('package.json')
-
-    coffee:
-      glob_to_multiple:
-        expand: true
-        cwd: 'src'
-        src: ['**/*.coffee']
-        dest: 'lib'
-        ext: '.js'
-
-    coffeelint:
-      options:
-        no_empty_param_list:
-          level: 'error'
-        max_line_length:
-          level: 'ignore'
-        indentation:
-          level: 'ignore'
-
-      src: ['src/*.coffee']
-      test: ['spec/*.coffee']
-      gruntfile: ['Gruntfile.coffee']
-
-    shell:
-      test:
-        command: 'jasmine-focused --captureExceptions --coffee spec/'
-        options:
-          stdout: true
-          stderr: true
-          failOnError: true
-
-  grunt.loadNpmTasks('grunt-contrib-coffee')
-  grunt.loadNpmTasks('grunt-shell')
-  grunt.loadNpmTasks('grunt-coffeelint')
-
-  grunt.registerTask 'clean', -> require('rimraf').sync('lib')
-  grunt.registerTask('lint', ['coffeelint'])
-  grunt.registerTask('default', ['coffee', 'lint'])
-  grunt.registerTask('test', ['coffee', 'lint', 'shell:test'])
diff --git a/package.json b/package.json
index e21d6d8..7469337 100644
--- a/package.json
+++ b/package.json
@@ -2,10 +2,9 @@
   "name": "selector-kit",
   "version": "0.0.0",
   "description": "A barebones toolkit for CSS selector parsing and matching.",
-  "main": "./lib/selector-kit",
+  "main": "./src/selector-kit",
   "scripts": {
-    "prepublish": "grunt clean lint coffee",
-    "test": "grunt test"
+    "test": "jasmine-focused --captureExceptions --coffee spec/"
   },
   "repository": {
     "type": "git",
@@ -21,12 +20,6 @@
   "devDependencies": {
     "coffee-script": "^1.7.0",
     "jasmine-focused": "^1.0.4",
-    "grunt-contrib-coffee": "^0.9.0",
-    "grunt-cli": "^0.1.8",
-    "grunt": "^0.4.1",
-    "grunt-shell": "^0.2.2",
-    "grunt-coffeelint": "^0.0.6",
-    "rimraf": "^2.2.2",
     "coffee-cache": "^0.2.0",
     "temp": "^0.6.0"
   }
diff --git a/src/selector-kit.js b/src/selector-kit.js
index 06f9512..129b176 100644
--- a/src/selector-kit.js
+++ b/src/selector-kit.js
@@ -1,2 +1,3 @@
-module.exports =
-  {Selector: require('./selector')};
+module.exports = {
+  Selector: require("./selector.js")
+};
diff --git a/src/selector.js b/src/selector.js
index 3c0a99c..33b6bcb 100644
--- a/src/selector.js
+++ b/src/selector.js
@@ -1,18 +1,9 @@
-/*
- * decaffeinate suggestions:
- * DS101: Remove unnecessary use of Array.from
- * DS102: Remove unnecessary code created because of implicit returns
- * DS205: Consider reworking code to avoid use of IIFEs
- * DS207: Consider shorter variations of null checks
- * Full docs: https://github.com/decaffeinate/decaffeinate/blob/main/docs/suggestions.md
- */
-let Selector;
-const slick = require('atom-slick');
+const slick = require("atom-slick");
 
 let indexCounter = 0;
 
 module.exports =
-(Selector = class Selector {
+class Selector {
   // Public: Creates one or more {Selector} objects.
   //
   // This method will return more than one `Selector` object when the string
@@ -24,35 +15,33 @@ module.exports =
   //
   // Returns an {Array} or {Selector} objects.
   static create(selectorString, options) {
-    return (() => {
-      const result = [];
-      for (let selectorAst of Array.from(slick.parse(selectorString))) {
-        for (let selectorComponent of Array.from(selectorAst)) { this.parsePseudoSelectors(selectorComponent); }
-        result.push(new (this)(selectorAst, options));
+    const result = [];
+    for (let selectorAst of Array.from(slick.parse(selectorString))) {
+      for (let selectorComponent of Array.from(selectorAst)) {
+        this.parsePseudoSelectors(selectorComponent);
       }
-      return result;
-    })();
+      result.push(new (this)(selectorAst, options));
+    }
+    return result;
   }
 
   static parsePseudoSelectors(selectorComponent) {
     if (selectorComponent.pseudos == null) { return; }
-    return (() => {
-      const result = [];
-      for (let pseudoClass of Array.from(selectorComponent.pseudos)) {
-        if (pseudoClass.name === 'not') {
-          if (selectorComponent.notSelectors == null) { selectorComponent.notSelectors = []; }
-          result.push(selectorComponent.notSelectors.push(...Array.from(this.create(pseudoClass.value) || [])));
-        } else {
-          result.push(console.warn(`Unsupported pseudo-selector: ${pseudoClass.name}`));
-        }
+    const result = [];
+    for (let pseudoClass of selectorComponent.pseudos) {
+      if (pseudoClass.name === "not") {
+        if (selectorComponent.notSelectors == null) { selectorComponent.notSelectors = []; }
+        result.push(selectorComponent.notSelectors.push(...Array.from(this.create(pseudoClass.value) || [])));
+      } else {
+        result.push(console.warn(`Unsupported pseudo-selector: ${pseudoClass.name}`));
       }
-      return result;
-    })();
+    }
+    return result;
   }
 
   constructor(selector, options) {
     this.selector = selector;
-    const priority = (options != null ? options.priority : undefined) != null ? (options != null ? options.priority : undefined) : 0;
+    const priority = options?.priority ?? 0;
     this.specificity = this.calculateSpecificity();
     this.index = priority + indexCounter++;
   }
@@ -171,4 +160,4 @@ module.exports =
 
     return (a * 100) + (b * 10) + (c * 1);
   }
-});
+}