Instructions for Developers

Selfhost Setup

install Code: https://code.visualstudio.com/
git clone https://github.com/flowtype/flow-for-vscode.git
run yarn install --pure-lockfile
open Code on flow-for-vscode
link the extension into Code: ln -s ABSOLUTE_PATH_OF_FLOW_FOR_VSCODE ~/.vscode/extensions/flow-for-vscode
reload Code (Cmd+Shift+P, Reload Window) to enable the extension
make changes to the extension and reload to selfhost on your changes

you can use the built-in babel task to start babel in watch mode (Cmd+Shift+B to start it, Cmd+Shift+U to toggle output)
make changes
open debug viewlet (Cmd+Shift+D) and run the extension to try changes (F5)
from the opened instance open a folder with flow files (File | Open...)