Flow and node.js

To use flow in node application first one needs to install it and run init:

$ npm install -g flow-bin
$ flow init

Next step is less intuitive. Flow, by default doesn’t look into node_modules for finding code. Also it ignores NODE_PATH environment settings. That causes problem when the project uses custom one. Both of those can be easily fixed by modifying .flowconfig. Following lines will add both node_modules and lib to search path for the flow.

[options]
module.system.node.resolve_dirname=lib
module.system.node.resolve_dirname=node_modules

The above example was found in this commit.