Is it possible to set a vim.api.nvim_create_autocmd for a FileType (not just a pattern)?

Question

Currently I'm using pattern in vim.api.nvim.create_autocmd():

vim.api.nvim_create_autocmd({ "BufEnter", "BufFilePost" }, {
  pattern = { "*.tf" },
  callback = SetTerraformMappings,
  group = terraformGrp,
})

But I would prefer to use filetype somehow instead of pattern. In vimscript I could

autocmd Filetype terraform lua SetTerraformMappings()

Also as a workaround I can just create ~/.config/nvim/after/ftplugin/terraform.vim with the mappings there:

nnoremap <buffer> <leader>t :Shell terraform plan -out latest.tfplan<cr>
nnoremap <buffer> <leader>r :Shell terraform apply latest.tfplan<cr>

But I wonder, is there an equivalent to autocmd Filetype xxx yyy in lua nvim_create_autocmd()?

Note that filetype and pattern are not exactly equivalent because filetypes sometime inspect the contents of the file to do the filetype detection.

Answer 1

It is possible write is like this in lua, just use the FileType event.

(replace your file type, I don´t what is the correct one for terraform)

vim.api.nvim_create_autocmd( "FileType", {
  pattern = "yourfiletype",
  callback = SetTerraformMappings,
  group = terraformGrp,
})

You can see a demonstration by awesome TJDeVries