diff --git a/src/compiler/utils/error.ts b/src/compiler/utils/error.ts
index 3ad609ae63..89b24ac6b2 100644
--- a/src/compiler/utils/error.ts
+++ b/src/compiler/utils/error.ts
@@ -1,43 +1,71 @@
 import { locate } from 'locate-character';
-import get_code_frame from './get_code_frame';
+import get_code_frame from './get_code_frame.js';
 
+/**
+* @extends Error
+ */
 class CompileError extends Error {
-	code: string;
-	start: { line: number; column: number };
-	end: { line: number; column: number };
-	pos: number;
-	filename: string;
-	frame: string;
-
-	toString() {
-		return `${this.message} (${this.start.line}:${this.start.column})\n${this.frame}`;
-	}
+
+ /**
+ * @type {string}
+ */
+    code = undefined;
+
+ /**
+ * @type {{ line: number; column: number }}
+ */
+    start = undefined;
+
+ /**
+ * @type {{ line: number; column: number }}
+ */
+    end = undefined;
+
+ /**
+ * @type {number}
+ */
+    pos = undefined;
+
+ /**
+ * @type {string}
+ */
+    filename = undefined;
+
+ /**
+ * @type {string}
+ */
+    frame = undefined;
+    toString() {
+        return `${this.message} (${this.start.line}:${this.start.column})\n${this.frame}`;
+    }
 }
 
-export default function error(
-	message: string,
-	props: {
-		name: string;
-		code: string;
-		source: string;
-		filename: string;
-		start: number;
-		end?: number;
-	}
-): never {
-	const error = new CompileError(message);
-	error.name = props.name;
-
-	const start = locate(props.source, props.start, { offsetLine: 1 });
-	const end = locate(props.source, props.end || props.start, { offsetLine: 1 });
-
-	error.code = props.code;
-	error.start = start;
-	error.end = end;
-	error.pos = props.start;
-	error.filename = props.filename;
-
-	error.frame = get_code_frame(props.source, start.line - 1, start.column);
-
-	throw error;
+/**
+ * @param {string} message
+ * @param {{
+ * 		name: string;
+ * 		code: string;
+ * 		source: string;
+ * 		filename: string;
+ * 		start: number;
+ * 		end?: number;
+ * 	}} props
+ * @returns {never}
+ */
+export default function error(message, props) {
+    const error = new CompileError(message);
+    error.name = props.name;
+    const start = locate(props.source, props.start, { offsetLine: 1 });
+    const end = locate(props.source, props.end || props.start, { offsetLine: 1 });
+    error.code = props.code;
+    error.start = start;
+    error.end = end;
+    error.pos = props.start;
+    error.filename = props.filename;
+    error.frame = get_code_frame(props.source, start.line - 1, start.column);
+    throw error;
 }
+
+
+
+
diff --git a/src/compiler/utils/fuzzymatch.js b/src/compiler/utils/fuzzymatch.js
index e6323d0ae3..e7bb1ad697 100644
--- a/src/compiler/utils/fuzzymatch.js
+++ b/src/compiler/utils/fuzzymatch.js
@@ -7,6 +7,7 @@ export default function fuzzymatch(name, names) {
 	const matches = set.get(name);
 	return matches && matches[0] && matches[0][0] > 0.7 ? matches[0][1] : null;
 }
+
 // adapted from https://github.com/Glench/fuzzyset.js/blob/master/lib/fuzzyset.js
 // BSD Licensed
 const GRAM_SIZE_LOWER = 2;
@@ -31,6 +32,7 @@ function _distance(str1, str2) {
 		return 1 - distance / str2.length;
 	}
 }
+
 // helper functions
 
 /**
@@ -61,6 +63,7 @@ function levenshtein(str1, str2) {
 	}
 	return current.pop();
 }
+
 const non_word_regex = /[^\w, ]+/;
 
 /**
@@ -108,22 +111,15 @@ function gram_counter(value, gram_size = 2) {
 function sort_descending(a, b) {
 	return b[0] - a[0];
 }
-/** */
+
 class FuzzySet {
-	/**
-	 * @default {}
-	 */
 	exact_set = {};
-
-	/**
-	 * @default {}
-	 */
 	match_dict = {};
+	items = {};
 
 	/**
-	 * @default {}
+	 * @param {string[]} arr
 	 */
-	items = {};
 	constructor(arr) {
 		// initialization
 		for (let i = GRAM_SIZE_LOWER; i < GRAM_SIZE_UPPER + 1; ++i) {