The filesystem plugin provides dynamic values to access local files.
Beau sets the CWD to be the same as the Beau config file; This allows you to make all paths relative when using plugins that access the filesytem.
createReadStream(path: string[, options])
createReadStream is just an alias for Node's
It takes the same options. The created stream can be used internally by Beau to
read files and upload them using the request's formData.
POST /picture: alias: upload-picture formData: title: Kittens image: $[createReadStream('./kittens.jpg')]