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Set the File Type for a File in Neovim

Via Config

Something like this in ~/.config/nvim/init.lua 

vim.filetype.add({
  extension = {
    neoj = 'neoj'
  }
})

There is also pattern and path matching which are thing to look into. Especially the pattern matches which would let you do things like have an .html file that is a neoj filetype. See: vim.filetype.add()

Manually

:set filetype=THE_TYPE
-- end of line --

References