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co-child-process

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Co Child Process

Spawn a child process using co. Kind of like exec, except you can write to stdin and there aren't as many options like timeout or encoding.

Example

Minify a Javascript in a child process. Useful when the JS files are large and you don't want uglifyjs blocking the event loop.

var fs = require('fs')
var co = require('co')
var spawn = require('co-child-process')
// resolve the location of the binary 
var uglifyjs = require.resolve('uglify-js/bin/uglifyjs')
 
co(function* () {
  var stream = fs.createReadStream(__filename)
  var minified = yield spawn(uglifyjs, [
    '-' // tells uglifyjs to check for `stdin` 
  ]).pump(stream) // since you can't pipe into the generator 
})()

API

var output = spawn(command, [args], [options])

A wrapper around child_process.spawn. The arguments are simply passed and are not touched.

Output is always a string, for now.

var output = spawn(args...).pump(stream)

Pump a stream into the child process' stdin. Kind of like .pipe() but in the opposite direction.

Must be called on the same tick.

var output = spawn(args...).end(body)

Write a buffer or string body to stdin.

var out = yield spawn(uglifyjs, ['-']).end('var a = 1;')

Must be called on the same tick.