From 81a1a9584d50ddf76e7dd988ad0c6ad86f4f13d2 Mon Sep 17 00:00:00 2001
From: Daniel Bayley <daniel.bayley@me.com>
Date: Thu, 15 Oct 2020 16:28:16 +0100
Subject: [PATCH] Ignore false matches from CoffeeScript codebase
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

I'm not sure this is the best fix for this bug, which was hard to track down! But I have also attempted to address it here: https://github.com/evanw/node-source-map-support/pull/283… although looking at the activity on that repo, I don't have much hope of it being merged any time soon… Hence the reason for this PR.

See also: https://github.com/evanw/node-source-map-support/issues/254
---
 lib/util.js | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/util.js b/lib/util.js
index 1f810af1..d3ab3cf5 100644
--- a/lib/util.js
+++ b/lib/util.js
@@ -159,6 +159,8 @@ exports.compareByGeneratedPositionsInflated = compareByGeneratedPositionsInflate
  * JSON.
  */
 function parseSourceMapInput(str) {
+  // Ignore false matches from CoffeeScript codebase.
+  if (str.startsWith('zw(u')) return { version: 3, sources: [], mappings: [] }
   return JSON.parse(str.replace(/^\)]}'[^\n]*\n/, ""));
 }
 exports.parseSourceMapInput = parseSourceMapInput;