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I have a shell command which reads from stdin, processes the input, and writes to stdout. To call it synchronously from vim I can do system('mycommand', data) where data is some string my vimscript has prepared.

What's the equivalent way to pass data to stdin using job_start() / jobstart()?

Update: in this case I'm particularly interested in the answer for neovim.

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Vim:

let job = job_start(...)
let channel = job_getchannel(job)
call ch_sendraw(channel, data)
call ch_close_in(channel)

NeoVim:

let jobid = jobstart(...)
call chansend(jobid, data)
call chanclose(jobid, 'stdin')

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