Pass external data to hook

[tu1ly]

current:
can not pass external data to hook
expected:
can pass external data to hook

[smizell]

@tu1ly Could you provide a simple example here? What do you mean when you talk of external data? Thanks!

[honzajavorek]

I think this is duplicate of #433.

[honzajavorek]

...and since #433 is even duplicate of #215, I'm closing this :) The #215 now contains an example on how to use the custom configuration key for passing data to JavaScript hooks.