I broke up with neovim....vim is my best friend now

dot_vim/plugged/ale/ale_linters/javascript/flow_ls.vim

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+" Author: t_t <jamestthompson3@gmail.com>
+" Description: Integrate ALE with flow-language-server.
+
+call ale#Set('javascript_flow_ls_executable', 'flow')
+call ale#Set('javascript_flow_ls_use_global',
+\    get(g:, 'ale_use_global_executables', 0)
+\)
+
+function! ale_linters#javascript#flow_ls#FindProjectRoot(buffer) abort
+    let l:flow_config = ale#path#FindNearestFile(a:buffer, '.flowconfig')
+
+    if !empty(l:flow_config)
+        return fnamemodify(l:flow_config, ':h')
+    endif
+
+    return ''
+endfunction
+
+call ale#linter#Define('javascript', {
+\   'name': 'flow-language-server',
+\   'lsp': 'stdio',
+\   'executable': {b -> ale#path#FindExecutable(b, 'javascript_flow_ls', [
+\       'node_modules/.bin/flow',
+\   ])},
+\   'command': '%e lsp --from ale-lsp',
+\   'project_root': function('ale_linters#javascript#flow_ls#FindProjectRoot'),
+\   'language': 'javascript',
+\})