Metro CLI Options

The metro command line runner has a number of useful options. You can run metro --help to view all available options. Here is a brief overview:

`build <entry>`

Generates a JavaScript bundle containing the specified entrypoint and its descendants.

Option	Alias	Description	Value
`out`	`O`	File name where to store the output	String
`platform`	`p`	Which platform to bundle for	`web`, `android`, `ios`
`minify`	`z`	Whether Metro should minify the bundle	Boolean
`dev`	`g`	Create a development version of the build (`process.env.NODE_ENV = 'development'`)	Boolean
`config`	`c`	Location of the `metro.config.js` to use	String
`max-workers`	`j`	The number of workers Metro should parallelize the transformer on	Number
`project-roots`	`P`	The root folder of your project	Array
`source-map`		Whether Metro should generate source maps	Boolean
`source-map-url`		URL where the source map can be found	String
`legacy-bundler`		Whether Metro should use the legacy bundler	Boolean

Starts a Metro server on the given port, building bundles on the fly.

Lists dependencies.

Option	Description
`entry-file`	Absolute path to the root JS file
`output`	File name where to store the output, ex. /tmp/dependencies.txt
`platform`	The platform extension used for selecting modules
`transformer`	Specify a custom transformer to be used
`max-workers`	Specifies the maximum number of workers the worker-pool will spawn for transforming files. This defaults to the number of the cores available on your machine.
`dev`	If false, skip all dev-only code path
`verbose`	Enables logging