Make eslint respect the ale_warn_about_trailing_whitespace setting

autoload/ale/handlers/eslint.vim

@@ -143,6 +143,11 @@ function! ale#handlers#eslint#Handle(buffer, lines) abort
         " The code can be something like 'Error/foo/bar', or just 'Error'
         if !empty(get(l:split_code, 1))
             let l:obj.code = join(l:split_code[1:], '/')
+
+            if l:obj.code is# 'no-trailing-spaces'
+            \&& !ale#Var(a:buffer, 'warn_about_trailing_whitespace')
+                continue
+            endif
         endif
 
         for l:col_match in ale#util#GetMatches(l:text, s:col_end_patterns)

test/handler/test_eslint_handler.vader

@@ -1,15 +1,23 @@
 Before:
   Save g:ale_javascript_eslint_suppress_eslintignore
   Save g:ale_javascript_eslint_suppress_missing_config
+  Save g:ale_warn_about_trailing_whitespace
+  Save g:ale_warn_about_trailing_blank_lines
 
   let g:ale_javascript_eslint_suppress_eslintignore = 0
   let g:ale_javascript_eslint_suppress_missing_config = 0
+  let g:ale_warn_about_trailing_whitespace = 1
+  let g:ale_warn_about_trailing_blank_lines = 1
+  unlet! b:ale_warn_about_trailing_whitespace
+  unlet! b:ale_warn_about_trailing_blank_lines
 
 After:
   Restore
 
   unlet! b:ale_javascript_eslint_suppress_eslintignore
   unlet! b:ale_javascript_eslint_suppress_missing_config
+  unlet! b:ale_warn_about_trailing_whitespace
+  unlet! b:ale_warn_about_trailing_blank_lines
   unlet! g:config_error_lines
 
 Execute(The eslint handler should parse lines correctly):
@@ -394,3 +402,37 @@ Execute(Failing to connect to eslint_d should be handled correctly):
   \ ale#handlers#eslint#Handle(bufnr(''), [
   \  'Could not connect',
   \ ])
+
+Execute(Disabling warnings about trailing spaces should work):
+  silent! noautocmd file foo.ts
+
+  AssertEqual
+  \ [
+  \   {
+  \     'lnum': 182,
+  \     'col': 22,
+  \     'code': 'no-trailing-spaces',
+  \     'type': 'E',
+  \     'text': 'Trailing spaces not allowed.',
+  \   },
+  \ ],
+  \ ale#handlers#eslint#Handle(bufnr(''), [
+  \  'foo.js:182:22: Trailing spaces not allowed. [Error/no-trailing-spaces]',
+  \ ])
+
+  let g:ale_warn_about_trailing_whitespace = 0
+
+  AssertEqual
+  \ [],
+  \ ale#handlers#eslint#Handle(bufnr(''), [
+  \  'foo.js:182:22: Trailing spaces not allowed. [Error/no-trailing-spaces]',
+  \ ])
+
+  let g:ale_warn_about_trailing_whitespace = 1
+  let b:ale_warn_about_trailing_whitespace = 0
+
+  AssertEqual
+  \ [],
+  \ ale#handlers#eslint#Handle(bufnr(''), [
+  \  'foo.js:182:22: Trailing spaces not allowed. [Error/no-trailing-spaces]',
+  \ ])