Merge pull request #18304 from emberjs/bugfix/check-ember-env-at-corr…

…ect-time

[BUGFIX lts] Check the EMBER_ENV environment variable after it is set

lib/index.js

@@ -9,8 +9,6 @@ const buildDebugMacroPlugin = require('./build-debug-macro-plugin');
 const buildStripClassCallcheckPlugin = require('./build-strip-class-callcheck-plugin');
 const injectBabelHelpers = require('./transforms/inject-babel-helpers');
 
-const isProduction = process.env.EMBER_ENV === 'production';
-
 const PRE_BUILT_TARGETS = [
   'last 1 Chrome versions',
   'last 1 Firefox versions',
@@ -171,6 +169,8 @@ module.exports = {
     let ember;
     let targets = (this.project && this.project.targets && this.project.targets.browsers) || [];
 
+    const isProduction = process.env.EMBER_ENV === 'production';
+
     if (
       !isProduction &&
       (PRE_BUILT_TARGETS.every(target => targets.includes(target)) &&