remove setting NODE_ENV and add TS_NODE_DEV

Author: wclr

lib/wrap.js

@@ -15,8 +15,9 @@ var main = resolveMain(process.argv[1])
 
 var cfg = require('./cfg')(main, {})
 
-// Set NODE_ENV to 'development' unless already set
-if (!process.env.NODE_ENV) process.env.NODE_ENV = 'development'
+if (process.env.TS_NODE_DEV === undefined) {
+  process.env.TS_NODE_DEV = 'true'
+}
 
 if (process.env.NODE_DEV_PRELOAD) {
   require(process.env.NODE_DEV_PRELOAD)