Dash loads chunks unnecessarily

I would have expected that Dash only loads the js chunks that it actually needs. However, it seems that it loads all chunks for a library, even the ones you don’t use. Consider this small example app,

from dash import Dash, html

app = Dash()
app.layout = html.Div(["Hello world!"])

if __name__ == '__main__':
    app.run_server()

It uses only the html module, but the js chunk for e.g. for the dcc module is loaded anyhow,

which seems very ineffective. Is this by design? Or is it a bug? @chriddyp @alexcjohnson

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