dev condition and configuration support

lib/builder.js

@@ -155,7 +155,7 @@ Builder.prototype.reset = function(baseLoader) {
     loader.pluginLoader.config(cfg);
     var lCfg = extend({}, cfg);
     // build environment is not production or the browser, but will follow nodeConfig, because the build is in Node
-    lCfg.browserConfig = lCfg.productionConfig = undefined;
+    lCfg.browserConfig = lCfg.productionConfig = lCfg.devConfig = undefined;
     loaderConfig.call(this, lCfg);
     loader.configHash = generateConfigHash(loader);
   };
@@ -338,7 +338,7 @@ function processTraceOpts(options, defaults) {
     browser: undefined,
     node: undefined,
     production: undefined,
-    development: undefined,
+    dev: undefined,
     traceAllConditionals: true,
     conditions: {},
     traceConditionsOnly: false,
@@ -354,7 +354,7 @@ function processTraceOpts(options, defaults) {
   };
 
   // ensure user environment overrides default environment
-  if (options) {
+  if (typeof options == 'object') {
     if (typeof options.browser == 'boolean' || typeof options.node == 'boolean') {
       // browser true/false -> node is opposite
       if (typeof options.browser == 'boolean' && typeof options.node != 'boolean')
@@ -364,11 +364,14 @@ function processTraceOpts(options, defaults) {
         options.browser = !options.node;
     }
 
-    if (typeof options.development == 'boolean' || typeof options.production == 'boolean') {
+    // development -> dev backwards compat
+    if ('development' in options)
+      options.dev = options.development;
+    if (typeof options.dev == 'boolean' || typeof options.production == 'boolean') {
       if (typeof options.production != 'boolean')
-        options.production = !options.development;
-      if (typeof options.development != 'boolean')
-        options.development = !options.production;
+        options.production = !options.dev;
+      if (typeof options.dev != 'boolean')
+        options.dev = !options.production;
     }
   }
 
@@ -389,6 +392,8 @@ function processTraceOpts(options, defaults) {
   if (typeof opts.production == 'boolean') {
     opts.conditions['@system-env|production'] = opts.production;
     opts.conditions['~@system-env|production'] = opts.development;
+    opts.conditions['@system-env|dev'] = opts.development;
+    opts.conditions['~@system-env|dev'] = opts.production;
   }
 
   return opts;