how to get language auto complete on files that have exotic extensions

been playing around with [the templ html component system](  on goland and there is a [plugin]( that does syntax highlighting, but do you guys know how i can let Goland know that I should be able get auto complete for the html stuff and the go stuff as well?

i think maybe there's a list of filetypes that when recognized, are given this features and maybe i can just add the `.templ` file type on there? 


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