How to read React source code & where can I find a dir of special Component Function(such as, React.PureComponent) ?

[xgqfrms-GitHub]

How to read React source code ?

where can I find a dir path of special Component Function Defined? (such as , React.PureComponent)

I just very confused with the nested dirs & folders !

[gaearon]

Please see https://facebook.github.io/react/contributing/codebase-overview.html.

where can I find a dir of special Component Function(such as , React.PureComponent) ?

It is defined here but related logic is here (old engine) and here (new engine).