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Contents
const spawn = require('cross-spawn')
/** Spawns a child process, as long as you ask nicely.
*
* @param {string} command - The shell command to execute.
* @param {string[]} args - An array of arguments that are given after the command.
* @param {string | any} [stdin] - A string that is passed to stdin.
* @param {any} [options] - Options that are passed directly to child_process.spawn.
* @returns {Promise<string>}
*/
const spawnPlease = (command, args, stdin, options) => {
// if there are only three arguments and the third argument is an object, treat it as the options object and set stdin to null
if (!options && typeof stdin === 'object') {
options = stdin
stdin = undefined
}
// defaults
options = options || {}
if (options.rejectOnError === undefined) {
options.rejectOnError = true
}
let stdout = ''
let stderr = ''
const child = spawn(command, args, options)
return new Promise((resolve, reject) => {
if (stdin !== undefined && stdin !== null) {
child.stdin.write(stdin)
}
child.stdin.end()
child.stdout.on('data', data => {
stdout += data
if (options.stdout) options.stdout(data)
})
child.stderr.on('data', data => {
stderr += data
if (options.stderr) options.stderr(data)
})
if (options.rejectOnError) {
child.addListener('error', reject)
}
child.on('close', code => {
if (code !== 0 && options.rejectOnError) {
reject(stderr)
} else {
resolve(stdout)
}
})
})
}
module.exports = spawnPlease
Version data entries
33 entries across 33 versions & 1 rubygems