fix: unpaired apostrophe in JavaScript comments

src/parse.ts

@@ -109,7 +109,7 @@ export function parse(this: Eta, str: string): Array<AstObject> {
   );
 
   const parseCloseReg = new RegExp(
-    "'|\"|`|\\/\\*|(\\s*(-|_)?" + escapeRegExp(config.tags[1]) + ")",
+    "'|\"|`|\\/\\*|\\/\\/|(\\s*(-|_)?" + escapeRegExp(config.tags[1]) + ")",
     "g",
   );
 
@@ -161,6 +161,17 @@ export function parse(this: Eta, str: string): Array<AstObject> {
             ParseErr("unclosed comment", str, closeTag.index);
           }
           parseCloseReg.lastIndex = commentCloseInd;
+        } else if (char === "//") {
+          const lineTerminatorRegex = /[\n\r\u2028\u2029]/g;
+          lineTerminatorRegex.lastIndex = parseCloseReg.lastIndex;
+          const match = lineTerminatorRegex.exec(str);
+          if (match) {
+            parseCloseReg.lastIndex =
+              match.index +
+              (match[0] === "\r" && str[match.index + 1] === "\n" ? 2 : 1);
+          } else {
+            parseCloseReg.lastIndex = str.length;
+          }
         } else if (char === "'") {
           singleQuoteReg.lastIndex = closeTag.index;