reactjs - How do the `require`s in React's repo work? -


i'm looking extending react addon , looking through require statements looks lot of them requiring modules don't exist. how work?

if i'm looking make extend reacttransitiongroup, has require('reacttransitionchildmapping');, reacttransitionchildmapping isn't module, should do?

https://github.com/facebook/react/blob/master/src/addons/transitions/reacttransitiongroup.js

you can see requiring bunch of things aren't npm modules.

the react repo (and presumably other systems @ facebook) use custom require resolution solution based around @providesmodule annotation in various files. these compiled down standard commonjs modules via build step. check out reacttransitionchildmapping.js , you'll see following comment, part of block comment:

@providesmodule reacttransitionchildmapping

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