diff --git a/index.js b/index.js
index d4f47df..af81703 100644
--- a/index.js
+++ b/index.js
@@ -1,160 +1,177 @@
 /* eslint-disable promise/prefer-await-to-then */
 
+// Mapping for different Fullscreen API variations across browsers
 const methodMap = [
-	[
-		'requestFullscreen',
-		'exitFullscreen',
-		'fullscreenElement',
-		'fullscreenEnabled',
-		'fullscreenchange',
-		'fullscreenerror',
-	],
-	// New WebKit
-	[
-		'webkitRequestFullscreen',
-		'webkitExitFullscreen',
-		'webkitFullscreenElement',
-		'webkitFullscreenEnabled',
-		'webkitfullscreenchange',
-		'webkitfullscreenerror',
-
-	],
-	// Old WebKit
-	[
-		'webkitRequestFullScreen',
-		'webkitCancelFullScreen',
-		'webkitCurrentFullScreenElement',
-		'webkitCancelFullScreen',
-		'webkitfullscreenchange',
-		'webkitfullscreenerror',
-
-	],
-	[
-		'mozRequestFullScreen',
-		'mozCancelFullScreen',
-		'mozFullScreenElement',
-		'mozFullScreenEnabled',
-		'mozfullscreenchange',
-		'mozfullscreenerror',
-	],
-	[
-		'msRequestFullscreen',
-		'msExitFullscreen',
-		'msFullscreenElement',
-		'msFullscreenEnabled',
-		'MSFullscreenChange',
-		'MSFullscreenError',
-	],
+  // Standard
+  [
+    'requestFullscreen',
+    'exitFullscreen',
+    'fullscreenElement',
+    'fullscreenEnabled',
+    'fullscreenchange',
+    'fullscreenerror',
+  ],
+  // New WebKit
+  [
+    'webkitRequestFullscreen',
+    'webkitExitFullscreen',
+    'webkitFullscreenElement',
+    'webkitFullscreenEnabled',
+    'webkitfullscreenchange',
+    'webkitfullscreenerror',
+  ],
+  // Old WebKit
+  [
+    'webkitRequestFullScreen',
+    'webkitCancelFullScreen',
+    'webkitCurrentFullScreenElement',
+    'webkitCancelFullScreen',
+    'webkitfullscreenchange',
+    'webkitfullscreenerror',
+  ],
+  // Mozilla
+  [
+    'mozRequestFullScreen',
+    'mozCancelFullScreen',
+    'mozFullScreenElement',
+    'mozFullScreenEnabled',
+    'mozfullscreenchange',
+    'mozfullscreenerror',
+  ],
+  // Microsoft
+  [
+    'msRequestFullscreen',
+    'msExitFullscreen',
+    'msFullscreenElement',
+    'msFullscreenEnabled',
+    'MSFullscreenChange',
+    'MSFullscreenError',
+  ],
 ];
 
+// Native API detection and mapping
 const nativeAPI = (() => {
-	if (typeof document === 'undefined') {
-		return false;
-	}
-
-	const unprefixedMethods = methodMap[0];
-	const returnValue = {};
-
-	for (const methodList of methodMap) {
-		const exitFullscreenMethod = methodList?.[1];
-		if (exitFullscreenMethod in document) {
-			for (const [index, method] of methodList.entries()) {
-				returnValue[unprefixedMethods[index]] = method;
-			}
-
-			return returnValue;
-		}
-	}
-
-	return false;
+  if (typeof document === 'undefined') {
+    return false;
+  }
+
+  const unprefixedMethods = methodMap[0];
+  const returnValue = {};
+
+  // Loop through methodMap to find the supported fullscreen API
+  for (const methodList of methodMap) {
+    const exitFullscreenMethod = methodList?.[1]; // exitFullscreen or equivalent
+    if (exitFullscreenMethod in document) {
+      methodList.forEach((method, index) => {
+        returnValue[unprefixedMethods[index]] = method;
+      });
+      return returnValue;
+    }
+  }
+
+  return false;
 })();
 
+// Event names for fullscreen changes and errors
 const eventNameMap = {
-	change: nativeAPI.fullscreenchange,
-	error: nativeAPI.fullscreenerror,
+  change: nativeAPI.fullscreenchange,
+  error: nativeAPI.fullscreenerror,
 };
 
-// eslint-disable-next-line import/no-mutable-exports
+// Screenfull API implementation
 let screenfull = {
-	// eslint-disable-next-line default-param-last
-	request(element = document.documentElement, options) {
-		return new Promise((resolve, reject) => {
-			const onFullScreenEntered = () => {
-				screenfull.off('change', onFullScreenEntered);
-				resolve();
-			};
-
-			screenfull.on('change', onFullScreenEntered);
-
-			const returnPromise = element[nativeAPI.requestFullscreen](options);
-
-			if (returnPromise instanceof Promise) {
-				returnPromise.then(onFullScreenEntered).catch(reject);
-			}
-		});
-	},
-	exit() {
-		return new Promise((resolve, reject) => {
-			if (!screenfull.isFullscreen) {
-				resolve();
-				return;
-			}
-
-			const onFullScreenExit = () => {
-				screenfull.off('change', onFullScreenExit);
-				resolve();
-			};
-
-			screenfull.on('change', onFullScreenExit);
-
-			const returnPromise = document[nativeAPI.exitFullscreen]();
-
-			if (returnPromise instanceof Promise) {
-				returnPromise.then(onFullScreenExit).catch(reject);
-			}
-		});
-	},
-	toggle(element, options) {
-		return screenfull.isFullscreen ? screenfull.exit() : screenfull.request(element, options);
-	},
-	onchange(callback) {
-		screenfull.on('change', callback);
-	},
-	onerror(callback) {
-		screenfull.on('error', callback);
-	},
-	on(event, callback) {
-		const eventName = eventNameMap[event];
-		if (eventName) {
-			document.addEventListener(eventName, callback, false);
-		}
-	},
-	off(event, callback) {
-		const eventName = eventNameMap[event];
-		if (eventName) {
-			document.removeEventListener(eventName, callback, false);
-		}
-	},
-	raw: nativeAPI,
+  // Request fullscreen mode for the given element
+  request(element = document.documentElement, options) {
+    return new Promise((resolve, reject) => {
+      const onFullScreenEntered = () => {
+        screenfull.off('change', onFullScreenEntered);
+        resolve();
+      };
+
+      screenfull.on('change', onFullScreenEntered);
+
+      const returnPromise = element[nativeAPI.requestFullscreen](options);
+      if (returnPromise instanceof Promise) {
+        returnPromise.then(onFullScreenEntered).catch(reject);
+      }
+    });
+  },
+
+  // Exit fullscreen mode
+  exit() {
+    return new Promise((resolve, reject) => {
+      if (!screenfull.isFullscreen) {
+        resolve();
+        return;
+      }
+
+      const onFullScreenExit = () => {
+        screenfull.off('change', onFullScreenExit);
+        resolve();
+      };
+
+      screenfull.on('change', onFullScreenExit);
+
+      const returnPromise = document[nativeAPI.exitFullscreen]();
+      if (returnPromise instanceof Promise) {
+        returnPromise.then(onFullScreenExit).catch(reject);
+      }
+    });
+  },
+
+  // Toggle fullscreen mode
+  toggle(element, options) {
+    return screenfull.isFullscreen ? screenfull.exit() : screenfull.request(element, options);
+  },
+
+  // Listen for fullscreen change events
+  onchange(callback) {
+    screenfull.on('change', callback);
+  },
+
+  // Listen for fullscreen error events
+  onerror(callback) {
+    screenfull.on('error', callback);
+  },
+
+  // Add event listener for specified event (change or error)
+  on(event, callback) {
+    const eventName = eventNameMap[event];
+    if (eventName) {
+      document.addEventListener(eventName, callback, false);
+    }
+  },
+
+  // Remove event listener for specified event
+  off(event, callback) {
+    const eventName = eventNameMap[event];
+    if (eventName) {
+      document.removeEventListener(eventName, callback, false);
+    }
+  },
+
+  // Raw access to native fullscreen API
+  raw: nativeAPI,
 };
 
+// Define properties for screenfull (fullscreen status, current element, and API availability)
 Object.defineProperties(screenfull, {
-	isFullscreen: {
-		get: () => Boolean(document[nativeAPI.fullscreenElement]),
-	},
-	element: {
-		enumerable: true,
-		get: () => document[nativeAPI.fullscreenElement] ?? undefined,
-	},
-	isEnabled: {
-		enumerable: true,
-		// Coerce to boolean in case of old WebKit.
-		get: () => Boolean(document[nativeAPI.fullscreenEnabled]),
-	},
+  isFullscreen: {
+    get: () => Boolean(document[nativeAPI.fullscreenElement]),
+  },
+  element: {
+    enumerable: true,
+    get: () => document[nativeAPI.fullscreenElement] ?? undefined,
+  },
+  isEnabled: {
+    enumerable: true,
+    get: () => Boolean(document[nativeAPI.fullscreenEnabled]),
+  },
 });
 
+// Fallback in case Fullscreen API is not supported
 if (!nativeAPI) {
-	screenfull = {isEnabled: false};
+  screenfull = { isEnabled: false };
 }
 
 export default screenfull;