How much JavaScript knowledge is required for using Stimulus?

How much JavaScript knowledge is required to use Stimulus effectively, ES3, ES5, ES6 or beyond?

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Also interested, since it seems to be heavily relying on ES modules and ES6+

Much much less if it would be react or vue. The main feature I like it for what is that it’s highly structured unlike for example from jquery.

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however, can reliance on modules and es6+ be ommited entirely?