1

How to print, all file extensions & the mapped major modes (and possibly minor modes...) in emacs? like this,

*.js     js-mode
*.json   js-mode
*.c      c-mode

Which global map variable contains this information?

4

That information is a F1 v auto-mode-alist away which displays the variable auto-mode-alist that holds the associations between file names and major modes. As its docstring points out similiar lists playing a role would be interpreter-mode-alist (which uses shebangs) and the more generic magic-mode-alist.

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