append sourceMappingURL when using bin/6to5 and output sourcemaps - fixes #183

CHANGELOG.md

@@ -1,3 +1,7 @@
+# 1.12.20
+
+ * Append `sourceMappingURL` when using `bin/6to5` and output sourcemaps.
+
 # 1.12.19
 
  * Add `comments` option and `--remove-comments` flag. Thanks @[webpro](htps://github.com/webpro)!

bin/6to5/dir.js

@@ -19,7 +19,9 @@ module.exports = function (commander, filenames, opts) {
     mkdirp.sync(up);
 
     if (commander.sourceMaps) {
-      fs.writeFileSync(dest + ".map", JSON.stringify(data.map));
+      var mapLoc = dest + ".map";
+      data.code = util.addSourceMappingUrl(data.code, mapLoc);
+      fs.writeFileSync(mapLoc, JSON.stringify(data.map));
     }
 
     fs.writeFileSync(dest, data.code);

bin/6to5/file.js

@@ -56,7 +56,9 @@ module.exports = function (commander, filenames) {
 
     if (commander.outFile) {
       if (commander.sourceMaps) {
-        fs.writeFileSync(commander.outFile + ".map", JSON.stringify(result.map));
+        var mapLoc = commander.outFile + ".map";
+        result.code = util.addSourceMappingUrl(result.code, mapLoc);
+        fs.writeFileSync(mapLoc, JSON.stringify(result.map));
       }
 
       fs.writeFileSync(commander.outFile, result.code);

bin/6to5/util.js

@@ -1,6 +1,7 @@
 var readdir = require("fs-readdir-recursive");
 var index   = require("./index");
 var util    = require("../../lib/6to5/util");
+var path    = require("path");
 var to5     = require("../../lib/6to5");
 var fs      = require("fs");
 var _       = require("lodash");
@@ -11,6 +12,10 @@ exports.readdirFilter = function (filename) {
   });
 };
 
+exports.addSourceMappingUrl = function (code, loc) {
+  return code + "\n//# sourceMappingURL=" + path.basename(loc);
+};
+
 exports.transform = function (filename, code, opts) {
   opts = _.extend(opts || {}, index.opts);
   opts.filename = filename;

test/fixtures/bin/6to5/dir --out-dir --source-maps/out-files/lib/bar/bar.js

@@ -1,3 +1,4 @@
 "use strict";
 
 var Test = function Test() {};
+//# sourceMappingURL=bar.js.map

test/fixtures/bin/6to5/dir --out-dir --source-maps/out-files/lib/foo.js

@@ -3,3 +3,4 @@
 arr.map(function (x) {
   return x * MULTIPLIER;
 });
+//# sourceMappingURL=foo.js.map

test/fixtures/bin/6to5/filenames --out-file --source-maps/out-files/script3.js

@@ -6,3 +6,5 @@ var Test = function Test() {};
 arr.map(function (x) {
   return x * MULTIPLIER;
 });
+
+//# sourceMappingURL=script3.js.map

test/fixtures/bin/6to5/stdin --out-file --source-maps/out-files/test.js

@@ -3,3 +3,5 @@
 arr.map(function (x) {
   return x * x;
 });
+
+//# sourceMappingURL=test.js.map