Hyperstack hotloader is too slow about hyperstack HOT 2 OPEN

The hotloader was made for rails 5. In this version, sprockets created one .js per hyperstack/.rb file.
In rails 6 all files are merged in a single application.debug-.js file.
Every time a function name must be found at a specific line, application.debug-*.js is splitted on \n.
On my projet it does that >300 times.

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When a .rb file is changed on disk, it is sent to the browser via websocket and it is compiled by opal with Opal.compile.
Another performance issue is due to the parsing of strings by opal/parser. It is very slow. Some files of my project can take 20 seconds to be compiled. I patched the hotloader in order to compile it server side and send the javascript result to the browser. The same file can be hotloaded in 0.3 seconds.

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