Resolve sources relative to the source map

Source Map Revision 3: Resolving Sources
If the sources are not absolute URLs after prepending of the
“sourceRoot”, the sources are resolved relative to the SourceMap (like
resolving script src in a html document).

source-map-support.js

@@ -19,13 +19,19 @@ function mapSourcePosition(cache, position) {
     if (fs.existsSync(sourceMappingURL)) {
       var sourceMapData = fs.readFileSync(sourceMappingURL, 'utf8');
       try {
-        sourceMap = new SourceMapConsumer(sourceMapData);
+        sourceMap = [sourceMappingURL, new SourceMapConsumer(sourceMapData)];
         cache[position.source] = sourceMap;
       } catch (e) {
       }
     }
   }
-  return sourceMap ? sourceMap.originalPositionFor(position) : position;
+  if (sourceMap) {
+    var originalPosition = sourceMap[1].originalPositionFor(position);
+    originalPosition.source = path.resolve(path.dirname(sourceMap[0]), originalPosition.source)
+    return originalPosition
+  } else {
+      return position
+  }
 }
 
 // Parses code generated by FormatEvalOrigin(), a function inside V8:

test.js

@@ -4,6 +4,7 @@ var SourceMapGenerator = require('source-map').SourceMapGenerator;
 var child_process = require('child_process');
 var assert = require('assert');
 var fs = require('fs');
+var path = require('path');
 
 function compareStackTrace(source, expected) {
   var sourceMap = new SourceMapGenerator({
@@ -64,7 +65,7 @@ it('normal throw', function() {
     'throw new Error("test");'
   ], [
     'Error: test',
-    '    at Object.exports.test (./line1.js:1001:101)'
+    '    at Object.exports.test ('+path.join(process.cwd(),'line1.js')+':1001:101)'
   ]);
 });
 
@@ -76,8 +77,8 @@ it('throw inside function', function() {
     'foo();'
   ], [
     'Error: test',
-    '    at foo (./line2.js:1002:102)',
-    '    at Object.exports.test (./line4.js:1004:104)'
+    '    at foo ('+path.join(process.cwd(),'line2.js')+':1002:102)',
+    '    at Object.exports.test ('+path.join(process.cwd(),'line4.js')+':1004:104)'
   ]);
 });
 
@@ -92,9 +93,9 @@ it('throw inside function inside function', function() {
     'foo();'
   ], [
     'Error: test',
-    '    at bar (./line3.js:1003:103)',
-    '    at foo (./line5.js:1005:105)',
-    '    at Object.exports.test (./line7.js:1007:107)'
+    '    at bar ('+path.join(process.cwd(),'line3.js')+':1003:103)',
+    '    at foo ('+path.join(process.cwd(),'line5.js')+':1005:105)',
+    '    at Object.exports.test ('+path.join(process.cwd(),'line7.js')+':1007:107)'
   ]);
 });
 
@@ -103,8 +104,8 @@ it('eval', function() {
     'eval("throw new Error(\'test\')");'
   ], [
     'Error: test',
-    '    at Object.eval (eval at <anonymous> (./line1.js:1001:101))',
-    '    at Object.exports.test (./line1.js:1001:101)'
+    '    at Object.eval (eval at <anonymous> ('+path.join(process.cwd(),'line1.js')+':1001:101))',
+    '    at Object.exports.test ('+path.join(process.cwd(),'line1.js')+':1001:101)'
   ]);
 });
 
@@ -113,9 +114,9 @@ it('eval inside eval', function() {
     'eval("eval(\'throw new Error(\\"test\\")\')");'
   ], [
     'Error: test',
-    '    at Object.eval (eval at <anonymous> (eval at <anonymous> (./line1.js:1001:101)))',
-    '    at Object.eval (eval at <anonymous> (./line1.js:1001:101))',
-    '    at Object.exports.test (./line1.js:1001:101)'
+    '    at Object.eval (eval at <anonymous> (eval at <anonymous> ('+path.join(process.cwd(),'line1.js')+':1001:101)))',
+    '    at Object.eval (eval at <anonymous> ('+path.join(process.cwd(),'line1.js')+':1001:101))',
+    '    at Object.exports.test ('+path.join(process.cwd(),'line1.js')+':1001:101)'
   ]);
 });
 
@@ -127,9 +128,9 @@ it('eval inside function', function() {
     'foo();'
   ], [
     'Error: test',
-    '    at eval (eval at foo (./line2.js:1002:102))',
-    '    at foo (./line2.js:1002:102)',
-    '    at Object.exports.test (./line4.js:1004:104)'
+    '    at eval (eval at foo ('+path.join(process.cwd(),'line2.js')+':1002:102))',
+    '    at foo ('+path.join(process.cwd(),'line2.js')+':1002:102)',
+    '    at Object.exports.test ('+path.join(process.cwd(),'line4.js')+':1004:104)'
   ]);
 });
 
@@ -139,7 +140,7 @@ it('eval with sourceURL', function() {
   ], [
     'Error: test',
     '    at Object.eval (sourceURL.js:1:7)',
-    '    at Object.exports.test (./line1.js:1001:101)'
+    '    at Object.exports.test ('+path.join(process.cwd(),'line1.js')+':1001:101)'
   ]);
 });
 
@@ -149,8 +150,8 @@ it('eval with sourceURL inside eval', function() {
   ], [
     'Error: test',
     '    at Object.eval (sourceURL.js:1:7)',
-    '    at Object.eval (eval at <anonymous> (./line1.js:1001:101))',
-    '    at Object.exports.test (./line1.js:1001:101)'
+    '    at Object.eval (eval at <anonymous> ('+path.join(process.cwd(),'line1.js')+':1001:101))',
+    '    at Object.exports.test ('+path.join(process.cwd(),'line1.js')+':1001:101)'
   ]);
 });
 
@@ -163,11 +164,11 @@ it('default options', function(done) {
     'process.nextTick(function() { process.exit(1); });'
   ], [
     '',
-    './.original.js:1',
+    path.join(process.cwd(),'.original.js')+':1',
     'this is the original code',
     '^',
     'Error: this is the error',
-    '    at foo (./.original.js:1:1)'
+    '    at foo ('+path.join(process.cwd(),'.original.js')+':1:1)'
   ]);
 });
 
@@ -179,11 +180,11 @@ it('handleUncaughtExceptions is true', function(done) {
     'process.nextTick(foo);'
   ], [
     '',
-    './.original.js:1',
+    path.join(process.cwd(),'.original.js')+':1',
     'this is the original code',
     '^',
     'Error: this is the error',
-    '    at foo (./.original.js:1:1)'
+    '    at foo ('+path.join(process.cwd(),'.original.js')+':1:1)'
   ]);
 });
 
@@ -199,6 +200,6 @@ it('handleUncaughtExceptions is false', function(done) {
     'function foo() { throw new Error("this is the error"); }',
     '                       ^',
     'Error: this is the error',
-    '    at foo (./.original.js:1:1)'
+    '    at foo ('+path.join(process.cwd(),'.original.js')+':1:1)'
   ]);
 });