Add experimental code for fixing errors

autoload/ale/handlers/eslint.vim

@@ -0,0 +1,43 @@
+" Author: w0rp <devw0rp@gmail.com>
+" Description: eslint functions for handling and fixing errors.
+
+let g:ale_javascript_eslint_executable =
+\   get(g:, 'ale_javascript_eslint_executable', 'eslint')
+
+function! ale#handlers#eslint#GetExecutable(buffer) abort
+    if ale#Var(a:buffer, 'javascript_eslint_use_global')
+        return ale#Var(a:buffer, 'javascript_eslint_executable')
+    endif
+
+    " Look for the kinds of paths that create-react-app generates first.
+    let l:executable = ale#path#ResolveLocalPath(
+    \   a:buffer,
+    \   'node_modules/eslint/bin/eslint.js',
+    \   ''
+    \)
+
+    if !empty(l:executable)
+        return l:executable
+    endif
+
+    return ale#path#ResolveLocalPath(
+    \   a:buffer,
+    \   'node_modules/.bin/eslint',
+    \   ale#Var(a:buffer, 'javascript_eslint_executable')
+    \)
+endfunction
+
+function! ale#handlers#eslint#Fix(buffer, lines) abort
+    let l:config = ale#path#FindNearestFile(a:buffer, '.eslintrc.js')
+
+    if empty(l:config)
+        return 0
+    endif
+
+    return {
+    \   'command': ale#Escape(ale#handlers#eslint#GetExecutable(a:buffer))
+    \       . ' --config ' . ale#Escape(l:config)
+    \       . ' --fix %t',
+    \   'read_temporary_file': 1,
+    \}
+endfunction