Hi,
In the following issue : https://github.com/meteor/meteor/issues/8645 there is comment how to find where Buffer constructor is used :
" you can easily drop a breakpoint on the error in your browser’s inspector, then refresh the page to hit the breakpoint and see via the call stack which package is trying to use Buffer".
Thank you. It is helper.js in my case too.
Tried to add global.Buffer = global.Buffer || require("buffer").Buffer;inside <app_path>/client/lib/init.js but without luck.
Solved. By puttin global.Buffer = global.Buffer || require("buffer").Buffer; into <app_path>/client/lib/init.js.
My bad , I tried by putting it in some different folder inside <app_path>/client/. But it is solved that it must be put exactly in <app_path>/client/lib/init.js.