Fix support for absolute urls in sourceMappingURL

source-map-support.js

@@ -137,12 +137,14 @@ function supportRelativeURL(file, url) {
   var match = /^\w+:\/\/[^\/]*/.exec(dir);
   var protocol = match ? match[0] : '';
   var startPath = dir.slice(protocol.length);
+  var urlPath = url.startsWith(protocol) ? url.slice(protocol.length) : url;
+  var absolutePath = path.resolve(startPath, urlPath)
   if (protocol && /^\/\w\:/.test(startPath)) {
     // handle file:///C:/ paths
     protocol += '/';
-    return protocol + path.resolve(dir.slice(protocol.length), url).replace(/\\/g, '/');
+    return protocol + absolutePath.replace(/\\/g, '/');
   }
-  return protocol + path.resolve(dir.slice(protocol.length), url);
+  return protocol + absolutePath;
 }
 
 function retrieveSourceMapURL(source) {
@@ -524,6 +526,7 @@ exports.wrapCallSite = wrapCallSite;
 exports.getErrorSource = getErrorSource;
 exports.mapSourcePosition = mapSourcePosition;
 exports.retrieveSourceMap = retrieveSourceMap;
+exports.supportRelativeURL = supportRelativeURL;
 
 exports.install = function(options) {
   options = options || {};

test.js

@@ -1,4 +1,5 @@
-require('./source-map-support').install({
+var sourceMapSupport = require('./source-map-support');
+sourceMapSupport.install({
   emptyCacheBetweenOperations: true // Needed to be able to test for failure
 });
 
@@ -661,3 +662,11 @@ it('normal console.trace', function(done) {
     /^    at Object\.<anonymous> \((?:.*[/\\])?line2\.js:1002:102\)$/
   ]);
 });
+
+it('supports absolute source map urls', function() {
+  var sourceMapUrl = sourceMapSupport.supportRelativeURL(
+    'http://127.0.0.1:1336/chunk/chunk.js',
+    'http://127.0.0.1:1336/chunk/chunk.js.map',
+  );
+  assert.equal(sourceMapUrl, 'http://127.0.0.1:1336/chunk/chunk.js.map');
+});