feat: set process.env.NODE_ENV

Author: meixg

packages/mars-cli/lib/build.js

@@ -17,6 +17,9 @@ async function build(cmd) {
         build
     } = require(buildPath + '/src/scripts/run');
 
+
+    process.env.NODE_ENV = 'production';
+
     build(config, {
         target,
         build: true

packages/mars-cli/lib/serve.js

@@ -18,6 +18,9 @@ async function start(cmd) {
     } = require(buildPath + '/src/scripts/run');
 
     let isServiceStarted = false;
+
+    process.env.NODE_ENV = 'development';
+
     watch(config, {
         target
     }).on('stop', () => {