-const isDevelopmentBuild = process.env.BUILD === 'development'
-const isAnalyzeBuild = process.env.ANALYZE
-const isDocumentationBuild = process.env.DOCUMENTATION
+const isDevelopmentBuild = env.BUILD === 'development'
+const isAnalyzeBuild = env.ANALYZE
+const isDocumentationBuild = env.DOCUMENTATION
+const sourcemap = env.SOURCEMAP !== 'false'