zurk

🔬🧫

This subproject is a kind of experiment, addressed to the google/zx/issues/589. Just a testing ground for verifying ideas and approaches aimed at improve the zx architecture.

Concepts

• Layered architecture:
  • spawn builds a configurable exec context around the node:child_process API.
  • zurk implements the API for sync and async executions.
  • x provides the basic template-string API.
• Granularity: the package provides several entry points to help user to choose the right level of abstraction and/or to assist with tree-shaking.
• Extensibility:
  • The context object at every layer is accessible fo modify.
  • Typings are mostly represented by interfaces, so it's easy to tweak up if necessary.

Requirements

• OS
  • Linux
  • MacOS
  • Windows
• JS Runtime
  • Node.js >= 6 (CJS)
  • Node.js >= 12 (ESM)
  • Bun >= 1.0.0
  • Deno >= 1.7.0

Install

yarn add zurk

API

import {$, exec, zurk} from 'zurk'

const r1 = exec({sync: true, cmd: 'echo foo'})
const r2 = await zurk({sync: false, cmd: 'echo foo'})
const r3 = await $`echo foo`

Proposals

• [x] Promises in cmd literals

const foo = $`echo foo`
const foobarbaz = (await $`echo ${foo} ${$`echo bar`} ${await $`echo baz`}`)

• [x] Both sync and async executions

const p1 = $`echo foo`
const p2 = $({sync: true})`echo foo`

const o1 = (await p1).toString()  // foo
const o2 = await p1.stdout        // foo
const o3 = p2.stdout              // foo

• [x] Configurable input

const input = '{"name": "foo"}'
const name = await $({input})`jq -r .name` // foo

const stdin = fs.createReadStream(path.join(fixtures, 'foo.json'))
const data = await $({stdin})`jq -r .data` // foo

const p = $`echo "5\\n3\\n1\\n4\\n2"`
const sorted = $({input: p})`sort`          // 1\n2\n3\n4\n5

• [x] Pipe literals

const result = $`echo "5\\n3\\n1\\n4\\n2"`

const piped0 = result.pipe`sort | cat`     // '1\n2\n3\n4\n5'
const piped1 = result.pipe`sort`.pipe`cat` // ...
const piped2 = (await result).pipe`sort`
const piped3 = result.pipe($`sort`)

• [x] Pipe splitting

const result = $`echo 1; sleep 1; echo 2; sleep 1; echo 3`
const piped1 = result.pipe`cat`
let piped2: any

setTimeout(() => {
  piped2 = result.pipe`cat`
}, 1500)

await piped1
assert.equal((await piped1).toString(), '1\n2\n3')
assert.equal((await piped2).toString(), '1\n2\n3')

• [x] Presets

const $$ = $({sync: true, cmd: 'echo foo'})
const $$$ = $$({cmd: 'echo bar'})

const p1 = $$()           // foo
const p2 = $$$()          // bar
const p3 = $$`echo baz`   // baz

• [x] AbortController

const ac = new AbortController()
const p = $({nothrow: true, ac})`sleep 10`
setTimeout(() => {
  ac.signal.abort() // or just `p.abort()`
}, 500)

const { error } = await p
error.message // 'The operation was aborted'

• [x] Stdout limit

import {type TSpawnStore, $} from 'zurk'

const getFixedSizeArray = (size: number) => {
  const arr: any[] = []
  return new Proxy(arr, {
    get: (target: any, prop) =>
      prop === 'push' && arr.length >= size
        ? () => {}
        : target[prop]
  })
}
const store: TSpawnStore = {
  stdout: getFixedSizeArray(1),
  stderr: getFixedSizeArray(2),
  stdall: getFixedSizeArray(0)
}

const result = await $({store})`echo hello`
result.stdout // 'hello\n'
result.stdall // ''

License

MIT