support ESM babel configs #4
Merged
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Babel can load ES module config files (
.babelrc.js,babel.config.js), but only when it is used asynchronously. This PR implements that.When loading an ESM config file, Babel uses dynamic
import(), which means the config file itself will also be passed to@node-loader/babel. We cannot transform a config file with babel, since we need the config file to know what to do in the first place. So possibly-ESM babel config files must be ignored by the loader.Thanks!