From 6ba5476e9e378f24ac98e96040adc4599c229479 Mon Sep 17 00:00:00 2001
From: guybedford <guybedford@gmail.com>
Date: Wed, 18 May 2016 19:22:12 +0200
Subject: [PATCH] source maps debugging

---
 compilers/esm.js  |  2 +-
 lib/sourcemaps.js | 16 +++++++++-------
 2 files changed, 10 insertions(+), 8 deletions(-)

diff --git a/compilers/esm.js b/compilers/esm.js
index b50b8e0..90b9a06 100644
--- a/compilers/esm.js
+++ b/compilers/esm.js
@@ -89,7 +89,7 @@ exports.compile = function(load, opts, loader) {
     var babelOptions = {
       babelrc: false,
       plugins: [[require('babel-plugin-transform-es2015-modules-systemjs'), { systemGlobal: opts.systemGlobal }]],
-      filename: load.address,
+      filename: load.path,
       sourceMaps: opts.sourceMaps,
       inputSourceMap: load.metadata.sourceMap,
       moduleIds: !opts.anonymous,
diff --git a/lib/sourcemaps.js b/lib/sourcemaps.js
index adaa37c..33de894 100644
--- a/lib/sourcemaps.js
+++ b/lib/sourcemaps.js
@@ -59,7 +59,7 @@ exports.concatenateSourceMaps = function(outFile, mapsWithOffsets, basePath, sou
     }
 
     wrapSourceMap(map).eachMapping(function(mapping) {
-      if (mapping.source.match(/(\/|^)@traceur/))
+      if (!mapping.originalLine || !mapping.originalColumn || !mapping.source || mapping.source.match(/(\/|^)@traceur/))
         return;
 
       generated.addMapping({
@@ -82,13 +82,15 @@ exports.concatenateSourceMaps = function(outFile, mapsWithOffsets, basePath, sou
 
   if (sourceMapContents) {
     normalized.sourcesContent = normalized.sources.map(function(source) {
-      //if (contentsBySource[source])
-      //  return contentsBySource[source];
+      if (contentsBySource[source])
+        return contentsBySource[source];
 
-      try { return fs.readFileSync(path.resolve(basePath, source)).toString(); } catch (e) {}
-
-      // remove this if optimistic return is reliable
-      return contentsBySource[source];
+      try {
+        return fs.readFileSync(path.resolve(basePath, source)).toString();
+      }
+      catch (e) {
+        return "";
+      }
     });
   }