Zx

#!/usr/bin/env zx

await $`cat package.json | grep name`

const branch = await $`git branch --show-current`
await $`dep deploy --branch=${branch}`

const name = 'foo & bar'
await $`mkdir /tmp/${name}`  // No quotes needed — auto-escaped

npm install zx

zx ./script.mjs           # Direct execution
npx zx ./script.mjs       # Via npx
node --import zx/globals  # As Node.js loader

import 'zx/globals'

// Async (standard) — returns ProcessPromise
const output = await $`ls -la`

// Sync variant — returns ProcessOutput directly
const dir = $.sync`pwd`

// Arrays are flattened
const flags = ['--oneline', '--decorate', '--color']
await $`git log ${flags}`

// Non-zero exit codes throw ProcessOutput
try {
  await $`exit 1`
} catch (p) {
  console.log(`Exit: ${p.exitCode}, Error: ${p.stderr}`)
}

const $$ = $({ verbose: false, env: { NODE_ENV: 'production' } })
const pwd = $$.sync`pwd`

// Presets are chainable
const $1 = $({ nothrow: true })
const $2 = $1({ sync: true })  // Both nothrow + sync applied

$`cmd`              ProcessPromise (extends Promise)
  ├── .pipe()       Stream piping
  ├── .kill()       Terminate process
  ├── .text()       Output as string
  ├── .json()       Output as parsed JSON
  ├── .lines()      Output split by lines
  ├── .nothrow()    Suppress errors for this command
  ├── .quiet()      Suppress output for this command
  ├── .timeout()    Auto-kill after duration
  ├── .stdio()      Configure I/O
  ├── .exitCode     Promise<exit code>
  ├── .stdout       Readable stream
  ├── .stderr       Readable stream
  ├── .stdin        Writable stream
  ├── .pid / .cmd   Process metadata
  └── await → ProcessOutput
                ├── .stdout    string
                ├── .stderr    string
                ├── .exitCode  number
                ├── .signal    string|null
                ├── .text() / .json() / .lines() / .buffer() / .blob()
                └── .ok        boolean (when nothrow)

const results = await Promise.all([
  $`sleep 1; echo 1`,
  $`sleep 2; echo 2`,
  $`sleep 3; echo 3`,
])

$.nothrow = true

const repos = ['zx', 'webpod']
const clones = repos.map(n => $`git clone https://github.com/google/${n}`)

const results = await Promise.all(clones)
const errors = results.filter(o => !o.ok).map(o => o.stderr.trim())
console.log('Errors:', errors.join('\n'))

// Chain commands like bash pipes
const greeting = await $`printf "hello"`
  .pipe($`awk '{printf $1", world!"}'`)
  .pipe($`tr '[a-z]' '[A-Z]'`)

// Pipe to file
await $`echo "Hello!"`.pipe('/tmp/output.txt')

// Real-time output to terminal
await $`echo 1; sleep 1; echo 2; sleep 1; echo 3`.pipe(process.stdout)

// Split one source to multiple consumers
const p = $`some-command`
const [o1, o2] = await Promise.all([
  p.pipe`log`,
  p.pipe`extract`,
])

// Merge multiple sources
const $h = $({ halt: true })
const p1 = $`echo foo`
const p2 = $h`echo a && sleep 0.1 && echo b`
const p3 = $h`echo c && sleep 0.1 && echo d`
const cat = $h`cat`
p1.pipe(cat); p2.pipe(cat); p3.pipe(cat)
await cat.run()

const p = $`echo '{"foo":"bar"}\nline2'`

await p.json()    // { foo: 'bar' }
await p.lines()   // ['{"foo":"bar"}', 'line2']
await p.text()    // '{"foo":"bar"}\nline2\n'

for await (const line of $`git log --oneline --max-count=5`) {
  console.log(line)
}

import { useBash, usePowerShell, usePwsh } from 'zx'

usePowerShell()  // PowerShell.exe
usePwsh()        // PowerShell v7+
useBash()        // Back to bash

// Manual override
$.shell = '/bin/zsh'