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# `server-spawn` ()

When the development server boots up it emits this event if plugins want to spawn their own development tools. For instance it can be used to start a background process that kicks off webpack or similar tools. There is a second event called server-stop which can be used to detect server shutdowns.

## Example

    import os
    from subprocess import Popen

    class MyPlugin(Plugin):
        ...

        webpack = None

        def on_server_spawn(self, **extra):
            path = os.path.join(self.env.root_path, 'webpack')
            self.webpack = Popen(['webpack', '--watch'], cwd=path)

        def on_server_stop(self, **extra):
            if self.webpack is not None:
                self.webpack.kill()

A list of some plugins that make use of this event is available here.

## Comments