Remove the need for pointless callbacks for LSP linters

ale_linters/typescript/tsserver.vim

@@ -11,14 +11,9 @@ function! ale_linters#typescript#tsserver#GetExecutable(buffer) abort
     \])
 endfunction
 
-function! ale_linters#typescript#tsserver#Handle(buffer, lines) abort
-    return a:lines
-endfunction
-
 call ale#linter#Define('typescript', {
 \   'name': 'tsserver',
 \   'lsp': 'tsserver',
 \   'executable_callback': 'ale_linters#typescript#tsserver#GetExecutable',
 \   'command_callback': 'ale_linters#typescript#tsserver#GetExecutable',
-\   'callback': 'ale_linters#typescript#tsserver#Handle',
 \})

autoload/ale/linter.vim

@@ -52,21 +52,24 @@ function! ale#linter#PreProcess(linter) abort
     let l:obj = {
     \   'name': get(a:linter, 'name'),
     \   'lsp': get(a:linter, 'lsp', ''),
-    \   'callback': get(a:linter, 'callback'),
     \}
 
     if type(l:obj.name) != type('')
         throw '`name` must be defined to name the linter'
     endif
 
-    if !s:IsCallback(l:obj.callback)
-        throw '`callback` must be defined with a callback to accept output'
-    endif
-
     let l:needs_address = l:obj.lsp ==# 'socket'
     let l:needs_executable = l:obj.lsp !=# 'socket'
     let l:needs_command = l:obj.lsp !=# 'socket'
 
+    if empty(l:obj.lsp)
+        let l:obj.callback = get(a:linter, 'callback')
+
+        if !s:IsCallback(l:obj.callback)
+            throw '`callback` must be defined with a callback to accept output'
+        endif
+    endif
+
     if index(['', 'socket', 'stdio', 'tsserver'], l:obj.lsp) < 0
         throw '`lsp` must be either `''lsp''` or `''tsserver''` if defined'
     endif

test/test_linter_defintion_processing.vader

@@ -372,7 +372,6 @@ Execute(PreProcess should accept tsserver LSP configuration):
   \ 'executable': 'x',
   \ 'command': 'x',
   \ 'lsp': 'tsserver',
-  \ 'callback': 'x',
   \}
 
   AssertEqual 'tsserver', ale#linter#PreProcess(g:linter).lsp
@@ -393,7 +392,6 @@ Execute(PreProcess should accept stdio LSP configuration):
   \ 'executable': 'x',
   \ 'command': 'x',
   \ 'lsp': 'stdio',
-  \ 'callback': 'x',
   \}
 
   AssertEqual 'stdio', ale#linter#PreProcess(g:linter).lsp
@@ -412,7 +410,6 @@ Execute(PreProcess should accept LSP server configurations):
   let g:linter = {
   \ 'name': 'x',
   \ 'lsp': 'socket',
-  \ 'callback': 'x',
   \ 'address_callback': 'X',
   \}
 
@@ -422,7 +419,6 @@ Execute(PreProcess should require an address_callback for LSP socket configurati
   let g:linter = {
   \ 'name': 'x',
   \ 'lsp': 'socket',
-  \ 'callback': 'x',
   \}
 
   AssertThrows call ale#linter#PreProcess(g:linter)