treesit.el sets treesit-outline-predicate automatically based on imenu settings, so if I execute M-x outline-cycle in clojure-ts-mode buffer when point is on function or var definition, it hides the content correctly:

In clojure-mode it works differently, there we set 2 buffer local variables:

(setq-local outline-regexp ";;;;* ")
(setq-local outline-level 'lisp-outline-level)

Which allows hiding buffer content based on comments starting from 4 and more semicolons. M-x outline-cycle doesn't fold def-like forms in clojure-mode.

I don't think it's possible to set treesit-outline-predicate to fold special comments, any comment in the syntax tree is just a (comment) node, no matter how many semicolons are there. To calculate outline depth treesit.el just counts how many parent nodes does the current node have, but (comment) node, which is supposed to be outline heading is always top-level.

What is the desired behavior of outline-minor-mode for clojure-ts-mode? We can leave default treesit-based settings and fold forms based on imenu, or we can just use the same settings as clojure-mode to fold comments.

support for outshine mode #82

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