You can add support for Flow in Emacs by using flow-for-emacs
cd ~/.emacs.d/ git clone https://github.com/flowtype/flow-for-emacs.git echo -e "\n(load-file \"~/.emacs.d/flow-for-emacs/flow.el\")" >> ~/.emacs
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Licensed under the MIT License.
https://flow.org/en/docs/editors/emacs