@@ -4,15 +4,15 @@ Advanced Options:
 
     Skip detection and always insert definitions for process, global,
     __filename, and __dirname.
-                  
+
     benefit: faster builds
     cost: extra bytes
- 
+
   --insert-global-vars, --igv
 
     Comma-separated list of global variables to detect and define.
     Default: __filename,__dirname,process,Buffer,global
- 
+
   --detect-globals, --dg            [default: true]
 
     Detect the presence of process, global, __filename, and __dirname and define
@@ -36,16 +36,16 @@ Advanced Options:
     provides the core builtins.
 
   --no-commondir
- 
+
     Turn off setting a commondir. This is useful if you want to preserve the
-    original paths that a bundle was generated with. 
- 
+    original paths that a bundle was generated with.
+
   --no-bundle-external
 
     Turn off bundling of all external modules. This is useful if you only want
     to bundle your local files.
 
-  --bare 
+  --bare
 
     Alias for both --no-builtins, --no-commondir, and sets --insert-global-vars
     to just "__filename,__dirname". This is handy if you want to run bundles in
@@ -56,6 +56,15 @@ Advanced Options:
     Turn off package.json browser field resolution. This is also handy if you
     need to run a bundle in node.
 
+  --transform-key
+
+    Instead of the default package.json#browserify#transform field to list
+    all transforms to apply when running browserify, a custom field, like, e.g.
+    package.json#browserify#production or package.json#browserify#staging
+    can be used, by for example running:
+    * `browserify index.js --transform-key=production > bundle.js`
+    * `browserify index.js --transform-key=staging > bundle.js`
+
   --node
 
     Alias for --bare and --no-browser-field.
@@ -66,7 +75,7 @@ Advanced Options:
     preserving the original paths that a bundle was generated with.
 
   --deps
-  
+
     Instead of standard bundle output, print the dependency array generated by
     module-deps.
 
@@ -75,7 +84,7 @@ Advanced Options:
     Turn off deduping.
 
   --list
- 
+
     Print each file in the dependency graph. Useful for makefiles.
 
   --extension=EXTENSION
@@ -101,4 +110,3 @@ Passing arguments to transforms and plugins:
   will call the `foo` transform for each applicable file by calling:
 
     foo(file, { x: 3, beep: true })
-
 
@@ -51,7 +51,7 @@ module.exports = function (args, opts) {
             node: false
         }
     });
-    
+
     var entries = argv._.concat(argv.entry)
     .filter(Boolean).map(function (entry) {
         if (entry === '-') {
@@ -64,7 +64,7 @@ module.exports = function (args, opts) {
         }
         return entry;
     });
-    
+
     if (argv.node) {
         argv.bare = true;
         argv.browserField = false;
@@ -76,7 +76,7 @@ module.exports = function (args, opts) {
             argv.igv = '__filename,__dirname';
         }
     }
-    
+
     if (argv.igv) {
         var insertGlobalVars = {};
         var wantedGlobalVars = argv.igv.split(',');
@@ -86,12 +86,12 @@ module.exports = function (args, opts) {
             }
         });
     }
-    
+
     var ignoreTransform = argv['ignore-transform'] || argv.it;
     var b = browserify(xtend({
         noParse: Array.isArray(argv.noParse) ? argv.noParse : [argv.noParse],
         extensions: [].concat(argv.extension).filter(Boolean).map(function (extension) {
-            if (extension.charAt(0) != '.') { 
+            if (extension.charAt(0) != '.') {
                 return '.' + extension;
             } else {
                 return extension
@@ -105,6 +105,7 @@ module.exports = function (args, opts) {
         bundleExternal: argv['bundle-external'],
         basedir: argv.basedir,
         browserField: argv.browserField,
+        transformKey: argv['transform-key'] ? ['browserify', argv['transform-key']] : undefined,
         dedupe: argv['dedupe'],
 
         detectGlobals: argv.detectGlobals,
@@ -128,7 +129,7 @@ module.exports = function (args, opts) {
             b.plugin(pf, pOpts);
         })
     ;
-    
+
     [].concat(argv.ignore).filter(Boolean)
         .forEach(function (i) {
             b._pending ++;
@@ -144,11 +145,11 @@ module.exports = function (args, opts) {
             });
         })
     ;
-    
+
     [].concat(argv.exclude).filter(Boolean)
         .forEach(function (u) {
             b.exclude(u);
-            
+
             b._pending ++;
             glob(u, function (err, files) {
                 if (err) return b.emit('error', err);
@@ -164,7 +165,7 @@ module.exports = function (args, opts) {
             b.require(xs[0], { expose: xs.length === 1 ? xs[0] : xs[1] })
         })
     ;
-    
+
     // resolve any external files and add them to the bundle as externals
     [].concat(argv.external).filter(Boolean)
         .forEach(function (x) {
@@ -181,26 +182,26 @@ module.exports = function (args, opts) {
                 });
             }
             else add(x, {});
-            
+
             function add (x, opts) {
                 if (/^[\/.]/.test(x)) b.external(path.resolve(x), opts)
                 else b.external(x, opts)
             }
         })
     ;
-    
+
     [].concat(argv.transform)
         .filter(Boolean)
         .forEach(function (t) { addTransform(t) })
     ;
-    
+
     [].concat(argv.g).concat(argv['global-transform'])
         .filter(Boolean)
         .forEach(function (t) {
             addTransform(t, { global: true });
         })
     ;
-    
+
     function addTransform (t, opts) {
         if (typeof t === 'string' || typeof t === 'function') {
             b.transform(opts, t);
@@ -218,7 +219,7 @@ module.exports = function (args, opts) {
         }
         else error('unexpected transform of type ' + typeof t);
     }
-    
+
     [].concat(argv.command).filter(Boolean)
         .forEach(function (c) {
             var cmd = parseShell(c);
@@ -231,7 +232,7 @@ module.exports = function (args, opts) {
                 var ps = spawn(cmd[0], cmd.slice(1), { env: env });
                 var error = '';
                 ps.stderr.on('data', function (buf) { error += buf });
-                
+
                 ps.on('exit', function (code) {
                     if (code === 0) return;
                     console.error([
@@ -245,12 +246,12 @@ module.exports = function (args, opts) {
             });
         })
     ;
-    
+
     if (argv.standalone === '') {
         error('--standalone requires an export name argument');
         return b;
     }
-    
+
     return b;
 };
 
 
@@ -164,6 +164,15 @@ Advanced Options:
     Turn off package.json browser field resolution. This is also handy if you
     need to run a bundle in node.
 
+  --transform-key
+
+    Instead of the default package.json#browserify#transform field to list
+    all transforms to apply when running browserify, a custom field, like, e.g.
+    package.json#browserify#production or package.json#browserify#staging
+    can be used, by for example running:
+    * `browserify index.js --transform-key=production > bundle.js`
+    * `browserify index.js --transform-key=staging > bundle.js`
+
   --node
 
     Alias for --bare and --no-browser-field.