72c8cf0 Added experimental startSpinner() function. 53a215e Added the signal field to ProcessOutput. bf88f50 Added quiet() function (#313). 51fb6d5 Improved experemental echo()function.

import {echo} from 'zx/experimental'

// The echo() can be used both ways: 
echo`Current branch is ${branch}.`
// or
echo('Current branch is', branch)

import {startSpinner} from 'zx/experimental'

let stop = startSpinner()
await $`long-running command`
stop()

let p = nothrow($`while true; do :; done`)
setTimeout(() => p.kill('SIGKILL'), 1000)
let {signal} = await p
assert.equal(signal, 'SIGKILL')

await quiet($`grep something from-file`)
// Command and output will not be displayed.