Add support for finding references using LSP servers or tsserver

autoload/ale/lsp/message.vim

@@ -116,3 +116,13 @@ function! ale#lsp#message#Definition(buffer, line, column) abort
     \   'position': {'line': a:line - 1, 'character': a:column},
     \}]
 endfunction
+
+function! ale#lsp#message#References(buffer, line, column) abort
+    return [0, 'textDocument/references', {
+    \   'textDocument': {
+    \       'uri': ale#path#ToURI(expand('#' . a:buffer . ':p')),
+    \   },
+    \   'position': {'line': a:line - 1, 'character': a:column},
+    \   'context': {'includeDeclaration': v:false},
+    \}]
+endfunction

autoload/ale/lsp/tsserver_message.vim

@@ -61,3 +61,11 @@ function! ale#lsp#tsserver_message#Definition(buffer, line, column) abort
     \   'file': expand('#' . a:buffer . ':p'),
     \}]
 endfunction
+
+function! ale#lsp#tsserver_message#References(buffer, line, column) abort
+    return [0, 'ts@references', {
+    \   'line': a:line,
+    \   'offset': a:column,
+    \   'file': expand('#' . a:buffer . ':p'),
+    \}]
+endfunction