From 84ef8e8b09c816a88abf5abc0290d7b0776910b3 Mon Sep 17 00:00:00 2001
From: Jonny Gerig Meyer <jonny@oddbird.net>
Date: Mon, 29 Feb 2016 14:41:02 -0500
Subject: [PATCH] Do not output "undefined" if more mappings than lines.

---
 lib/fromStringWithSourceMap.js                        |  1 +
 .../from-to-tests/mismatched-mappings.expected.map    | 11 +++++++++++
 .../from-to-tests/mismatched-mappings.generated.txt   |  3 +++
 .../from-to-tests/mismatched-mappings.input.map       | 11 +++++++++++
 4 files changed, 26 insertions(+)
 create mode 100644 test/fixtures/from-to-tests/mismatched-mappings.expected.map
 create mode 100644 test/fixtures/from-to-tests/mismatched-mappings.generated.txt
 create mode 100644 test/fixtures/from-to-tests/mismatched-mappings.input.map

diff --git a/lib/fromStringWithSourceMap.js b/lib/fromStringWithSourceMap.js
index 2d75404..cbddf99 100644
--- a/lib/fromStringWithSourceMap.js
+++ b/lib/fromStringWithSourceMap.js
@@ -19,6 +19,7 @@ module.exports = function fromStringWithSourceMap(code, map) {
 	var currentSourceNodeLine;
 	mappings.forEach(function(mapping, idx) {
 		var line = lines[idx];
+		if(typeof line === 'undefined') return;
 		if(idx !== lines.length - 1) line += "\n";
 		if(!mapping)
 			return addCode(line);
diff --git a/test/fixtures/from-to-tests/mismatched-mappings.expected.map b/test/fixtures/from-to-tests/mismatched-mappings.expected.map
new file mode 100644
index 0000000..95bc6c8
--- /dev/null
+++ b/test/fixtures/from-to-tests/mismatched-mappings.expected.map
@@ -0,0 +1,11 @@
+{
+  "version": 3,
+  "file": "mismatched-mappings.generated.txt",
+  "sources": [
+    "hello-world.txt"
+  ],
+  "sourcesContent": [
+    "function foobar() {\n  return; // foo\n}"
+  ],
+  "mappings": "AAAA;AACA;AADA"
+}
diff --git a/test/fixtures/from-to-tests/mismatched-mappings.generated.txt b/test/fixtures/from-to-tests/mismatched-mappings.generated.txt
new file mode 100644
index 0000000..3244fe7
--- /dev/null
+++ b/test/fixtures/from-to-tests/mismatched-mappings.generated.txt
@@ -0,0 +1,3 @@
+function foobar() {
+  return; // foo
+}
\ No newline at end of file
diff --git a/test/fixtures/from-to-tests/mismatched-mappings.input.map b/test/fixtures/from-to-tests/mismatched-mappings.input.map
new file mode 100644
index 0000000..b4cf362
--- /dev/null
+++ b/test/fixtures/from-to-tests/mismatched-mappings.input.map
@@ -0,0 +1,11 @@
+{
+  "version": 3,
+  "file": "mismatched-mappings.generated.txt",
+  "sources": [
+    "hello-world.txt"
+  ],
+  "sourcesContent": [
+    "function foobar() {\n  return; // foo\n}"
+  ],
+  "mappings": "AAAA,SAAS,MAAT,GAAmB;AACjB;CADF;AAAmB"
+}