Where can I find the source code for the core updates, plugins and themes directory?

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As the title says, where can I see the code for the following endpoints?

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* [https://api.wordpress.org/core/version-check/1.6/])
* [https://api.wordpress.org/themes/info/1.1/])
* [https://api.wordpress.org/plugins/info/1.0/{slug}])

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