From 5957edb39b0e3119ac9b9c92a2d6fea8cc893266 Mon Sep 17 00:00:00 2001
From: Josh Kelley <joshkel@gmail.com>
Date: Wed, 20 Aug 2025 17:02:52 -0400
Subject: [PATCH] Handle infinite lastGeneratedColumn

If I understand correctly, the source-map library may set lastGeneratedColumn to infinity for the end of a mapping range:

https://github.com/mozilla/source-map/blob/v0.7.4/lib/source-map-consumer.js#L405

I believe it makes sense to represent this as the last valid column.

See #248
---
 src/lib/explore.ts | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/lib/explore.ts b/src/lib/explore.ts
index 0ad3fb9..450d9ef 100644
--- a/src/lib/explore.ts
+++ b/src/lib/explore.ts
@@ -179,7 +179,9 @@ function checkInvalidMappingColumn(context: ComputeFileSizesContext): void {
   const { line, generatedLine, generatedColumn } = context;
   const maxColumnIndex = line.length - 1;
 
-  if (generatedColumn > maxColumnIndex) {
+  if (generatedColumn === Infinity) {
+    context.generatedColumn = maxColumnIndex;
+  } else if (generatedColumn > maxColumnIndex) {
     if (isReferencingEOL(context, maxColumnIndex)) {
       return;
     }