Use a timer to defer configuration

There is no way to establish precedence or priority of autocommands in
Neovim, yet we want to ensure that the editorconfig options are applied
last, after any file type settings or settings from other plugins, to
ensure they have the highest priority. Using a timer with value 0 causes
the function to be deferred until after all other autocommands have run.

after/plugin/editorconfig.vim → plugin/editorconfig.vim

@@ -20,8 +20,13 @@ if exists('g:loaded_editorconfig') || !has('nvim')
 endif
 let g:loaded_editorconfig = 1
 
-" The autocmds must be set in the after/ directory to ensure they will run
-" last
+function! s:load(...)
+    lua require('editorconfig').config()
+endfunction
+
 augroup editorconfig
-    autocmd! BufNewFile,BufRead,BufFilePost * lua require('editorconfig').config()
+    " Use a timer with value 0 to defer executing the autocommand until after
+    " all other autocommands have run. This will ensure that settings applied
+    " by editorconfig take highest precedence.
+    autocmd! BufNewFile,BufRead,BufFilePost * call timer_start(0, function('s:load'))
 augroup END