flow-upgrade

A utility for upgrading your codebase to the latest version of Flow.

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flow-upgrade
A utility for upgrading your codebase to the latest version of Flow.
Install using yarn add flow-upgrade. We expect prettier to be installed as a peer dependency wherever you are running flow-upgrade.
You can then run:
yarn run flow-upgrade <current flow version> <target flow version>

You may also use npx:
npx flow-upgrade <current flow version> <target flow version>

We also supply the flow-codemod binary:
yarn run flow-codemod <codemod name>

If you just want to run a codemod without specifying Flow versions.

Options

all

By default, Flow will only upgrade files that have an // @flow header comment. If you want to upgrade all of your JavaScript files you may pass in the --all:
yarn create flow-upgrade --all

prettierrc

Path to a .prettierrc file to use. Upgrade codemods rely upon prettier to print the resulting code after transformation. If this is not provided, we will just use the defaults.