CLI.md

id	cli
title	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.

Options

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
resolver-option		Custom resolver options of the form key=value	Array
transform-option		Custom transform options of the form key=value	Array

serve

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

get-dependencies <entryFile>

List all dependencies that will be bundled for a given entry point.

Options

Option	Description
entry-file	Absolute path to the root JS file. This can also be given as the first positional arg.
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