Add option to turn off deduping

bin/advanced.txt

@@ -70,6 +70,10 @@ Advanced Options:
     Instead of standard bundle output, print the dependency array generated by
     module-deps.
 
+  --no-dedupe
+
+    Turn off deduping.
+
   --list
 
     Print each file in the dependency graph. Useful for makefiles.

bin/args.js

@@ -47,6 +47,7 @@ module.exports = function (args, opts) {
             commondir: true,
             'bundle-external': true,
             bf: true,
+            dedupe: true,
             node: false
         }
     });
@@ -104,7 +105,8 @@ module.exports = function (args, opts) {
         bundleExternal: argv['bundle-external'],
         basedir: argv.basedir,
         browserField: argv.browserField,
-
+        dedupe: argv['dedupe'],
+
         detectGlobals: argv.detectGlobals,
         insertGlobals: argv['insert-globals'] || argv.ig,
         insertGlobalVars: insertGlobalVars,

index.js

@@ -49,7 +49,9 @@ function Browserify (files, opts) {
     if (opts.basedir !== undefined && typeof opts.basedir !== 'string') {
         throw new Error('opts.basedir must be either undefined or a string.');
     }
-
+
+    opts.dedupe = opts.dedupe === false ? false : true;
+
     self._external = [];
     self._exclude = [];
     self._ignore = [];
@@ -380,7 +382,7 @@ Browserify.prototype._createPipeline = function (opts) {
 
     var dopts = {
         index: !opts.fullPaths && !opts.exposeAll,
-        dedupe: true,
+        dedupe: opts.dedupe,
         expose: this._expose
     };
     this._bpack = bpack(xtend(opts, { raw: true }));

readme.markdown

@@ -178,6 +178,10 @@ Advanced Options:
     Instead of standard bundle output, print the dependency array generated by
     module-deps.
 
+  --no-dedupe
+
+    Turn off deduping.
+
   --list
 
     Print each file in the dependency graph. Useful for makefiles.

test/dedupe-deps.js

@@ -41,3 +41,19 @@ test('identical content gets deduped with fullPaths', function (t) {
     );
   }
 })
+
+test('identical content does not get deduped with dedupe option false', function (t) {
+  t.plan(1)
+
+  var rows = [];
+  browserify({fullPaths: true, dedupe: false})
+    .on('dep', [].push.bind(rows))
+    .require(require.resolve('./dup'), { entry: true })
+    .bundle(check);
+
+  function check(err, src) {
+    if (err) return t.fail(err);
+    var deduped = rows.filter(function (x) { return x.dedupe });
+    t.equal(deduped.length, 0, 'does not dedupe');
+  }
+})