Spawn-CMD

• Spawn child process in Node with ease

Dependencies

• app-root-path
• @svkeg/jsutils
• tree-kill

Install

• Download the repo

    // Clone repo
    git clone https://github.com/lancetipton/spawn-cmd.git
    // Or Add to package.json
    "dependencies": {
      "spawn-cmd": "git+https://github.com/lancetipton/spawn-cmd.git"
      ...
    },

• Add to your code

  
    // * Require code
    const { spawnCmd } = require('spawn-cmd')
  
    // Spawns a new terminal session and runs `ls -la` inside of it
    await spawnCmd('ls -la')
  
    // Pass in a config object as the second argument
    // See more information about the config in the config section
    const config = { args: [ '-la' ] cwd: __dirname }
    await spawnCmd('ls', config)
  
    // Pass in a directory to run the command from as the third argument
    const config = { args: [ '-la' ] cwd: __dirname }
    await spawnCmd('ls', config, path.join(__dirname, '../'))
  

Config Object

• args - Arguments to pass to the spawned command
• cwd - Directory to run the command from
  • This can be overwirtten by passing the cwd as a third argument
• onExit - Called when the process exits
• onStdErr - Called on stderr output
• onError - Called on an error other then stderr
• onStdOut - Called on stdout
• options - Settings to pass to the spawned process
  • Is joined with the default settings below

      defaultSettings = {
        gid: process.getgid(),
        uid: process.getuid(),
        env: process.env,
        cwd: rootDir, // Project root directory, NOT spawn-cmd directory
        stdio: 'inherit',
      }

Extra Command

asyncCmd

• Extra command that wraps around nodes child_process.exec
• Makes it a promise wrapped in a try/catch
• Also adds the commands exit code
• Promise resolves consistently
• Example =>

    const { asyncCmd } = require('spawn-cmd')
        
    ;(()=>{
  
      const { error, data, exitCode } = await asyncCmd('echo test')
  
      // String output of stderr
      console.log(error)
  
      // String output of stdout
      console.log(data)
  
      // Numbered exit code from the command
      // 0 === success, anything else is exit from error
      console.log(exitCode)
  
    })()