chore: migrate splitter function to typescript and modern JS syntax

Signed-off-by: Maksim Sukharev <[email protected]>

Author: Antreesy

src/utils/splitter.ts

@@ -10,70 +10,85 @@
  * Accepts a string consisting of one or more valid JSON substrings and splits it. Any remaining string after the end of the last complete JSON substring is returned in the 'remainder' field.
  * Passing in invalid JSON can result in garbage output
  *
- * @param {string} string The string to look for JSON in
- * @returns {{ jsons: string[], remainder: '' }}
+ * @param string The string to look for JSON in
  *
  * @example
- * var splitter = require('json-string-splitter');
- *
- * var pieces = splitter('{"foo":"bar"}{"more":"json"}{"partial":"json"');
+ * const pieces = splitter('{"foo":"bar"}{"more":"json"}{"partial":"json"')
  *
  * console.log(pieces.jsons[0]); // '{"foo":"bar"}'
  * console.log(pieces.jsons[1]); // '{"more":"json"}'
  * console.log(pieces.remainder); // '{"partial":"json"'
  */
-export function splitter(string) {
-	var START = 0, JSON = 1, STRING = 2, ESCAPE = 3;
+export function splitter(string: string): { jsons: string[], remainder: string } {
+	const START = 0, JSON = 1, STRING = 2, ESCAPE = 3
 
-	var state = START;
-	var nesting_level = 0;
-	var json_start = null;
-	var bounds = [];
+	let state = START
+	let nestingLevel = 0
+	let jsonStart = null
+	const bounds = []
 
-	for(var i = 0 || 0; i < string.length; ++i) {
-		switch(state) {
-			case START:
-				switch(string[i]) {
-					case '{':
-						++nesting_level;
-						state = JSON;
-						json_start = i;
-						break;
+	for (let i = 0; i < string.length; ++i) {
+		switch (state) {
+			case START: {
+				switch (string[i]) {
+					case '{': {
+						++nestingLevel
+						state = JSON
+						jsonStart = i
+						break
+					}
 				}
-				break;
-			case JSON:
-				switch(string[i]) {
-					case '{': ++nesting_level; break;
-					case '}':
-						--nesting_level;
-						if(nesting_level === 0) {
-							state = START;
-							bounds.push({ start: json_start, end: i + 1 });
+				break
+			}
+			case JSON: {
+				switch (string[i]) {
+					case '{': {
+						++nestingLevel
+						break
+					}
+					case '}': {
+						--nestingLevel
+						if (nestingLevel === 0) {
+							state = START
+							bounds.push({ start: jsonStart, end: i + 1 })
 						}
-						break;
-					case '"': state = STRING; break;
+						break
+					}
+					case '"': {
+						state = STRING
+						break
+					}
 				}
-				break;
-			case STRING:
-				switch(string[i]) {
-					case '"': state = JSON; break;
-					case '\\': state = ESCAPE; break;
+				break
+			}
+			case STRING: {
+				switch (string[i]) {
+					case '"': {
+						state = JSON
+						break
+					}
+					case '\\': {
+						state = ESCAPE
+						break
+					}
 				}
-				break;
-			case ESCAPE:
-				state = STRING;
-				break;
+				break
+			}
+			case ESCAPE: {
+				state = STRING
+				break
+			}
 		}
 	}
 
-	var result = {
+	const result = {
 		jsons: [],
 		remainder: string.substring(bounds[bounds.length - 1].end),
 	}
 
 	bounds.forEach(function(v) {
-		result.jsons.push(string.substring(v.start, v.end));
-	});
+		result.jsons.push(string.substring(v.start, v.end))
+	})
 
-	return result;
+	return result
 }