packages/devtools_app/build.yaml - external/github.com/flutter/devtools - Git at Google

 targets:
   $default:
     builders:
       build_web_compilers|entrypoint:
         options:
           dart2js_args:
           - -O1
	targets:
	$default:
	builders:
	build_web_compilers\|entrypoint:
	options:
	dart2js_args:
	- -O1