From 7a900e3998a7951a178ef81dab612b5278957159 Mon Sep 17 00:00:00 2001
From: unknown <tejakshayak2009@gmail.com>
Date: Wed, 24 Jun 2026 12:16:53 -0600
Subject: [PATCH] fix: add smc.destroy(), handle unmapped lines and bare
 file:line:col format. SourceMapConsumer was never destroyed, leaking WASM
 memory and lines with no source map mapping were silently dropped. lines
 without a method name (file:line:col with trailing space) had leading
 whitespace in the parsed filenamewhich ended up breaking lookups

---
 index.js | 39 ++++++++++++++++++++++++---------------
 1 file changed, 24 insertions(+), 15 deletions(-)

diff --git a/index.js b/index.js
index dbd5b65..b02cb5e 100755
--- a/index.js
+++ b/index.js
@@ -32,7 +32,6 @@ const { file } = cli.flags;
 const mapPath = cli.input[0];
 if (!mapPath) cli.showHelp();
 const mapContent = JSON.parse(await readFile(mapPath, 'utf8'));
-// WTF? promise?
 const smc = await new SourceMapConsumer(mapContent);
 
 let str;
@@ -52,6 +51,12 @@ lines = lines.map((line) => {
     return `${match[1]}at ${match[3]} (${match[2]})`;
   }
 
+  // handle lines with no method name: '    file:line:col' or '    file:line:col '
+  const matchNoMethod = line.match(/^(\s+)([^\s]+:\d+:\d+)\s*$/);
+  if (matchNoMethod) {
+    return `${matchNoMethod[1]}at <unknown> (${matchNoMethod[2]})`;
+  }
+
   return line;
 })
 
@@ -60,19 +65,23 @@ if (stack.length === 0) throw new Error('No stack found');
 
 if (header) console.log(header);
 
-stack.forEach(({ methodName, lineNumber, column }) => {
-  try {
-    if (lineNumber == null || lineNumber < 1) {
-      console.log(`    at ${methodName || '[unknown]'}`);
-    } else {
-      const pos = smc.originalPositionFor({ line: lineNumber, column });
-      if (pos && pos.line != null) {
-        console.log(`    at ${pos.name || methodName || '[unknown]'} (${pos.source}:${pos.line}:${pos.column})`);
+try {
+  stack.forEach(({ methodName, lineNumber, column }) => {
+    try {
+      if (lineNumber == null || lineNumber < 1) {
+        console.log(`    at ${methodName || '[unknown]'}`);
+      } else {
+        const pos = smc.originalPositionFor({ line: lineNumber, column });
+        if (pos && pos.line != null) {
+          console.log(`    at ${pos.name || methodName || '[unknown]'} (${pos.source}:${pos.line}:${pos.column})`);
+        } else {
+          console.log(`    at ${methodName || '[unknown]'} (line ${lineNumber}:${column})`);
+        }
       }
-
-      // console.log('src', smc.sourceContentFor(pos.source));
+    } catch (err) {
+      console.log(`    at FAILED_TO_PARSE_LINE`);
     }
-  } catch (err) {
-    console.log(`    at FAILED_TO_PARSE_LINE`);
-  }
-});
+  });
+} finally {
+  smc.destroy();
+}