feat: add option to customize tsserver locale

README.md

@@ -141,6 +141,9 @@ require("typescript-tools").setup {
     -- described below
     tsserver_format_options = {},
     tsserver_file_preferences = {},
+    -- locale of all tsserver messages, supported locales you can find here:
+    -- https://github.com/microsoft/TypeScript/blob/3c221fc086be52b19801f6e8d82596d04607ede6/src/compiler/utilitiesPublic.ts#L620
+    tsserver_locale = "en",
     -- mirror of VSCode's `typescript.suggest.completeFunctionCalls`
     complete_function_calls = false,
     include_completions_with_insert_text = true,

lua/typescript-tools/config.lua

@@ -8,6 +8,7 @@
 ---@field tsserver_format_options table|fun(filetype: string): table
 ---@field tsserver_file_preferences table|fun(filetype: string): table
 ---@field tsserver_max_memory number|"auto"
+---@field tsserver_locale string
 ---@field complete_function_calls boolean
 ---@field expose_as_code_action ("fix_all"| "add_missing_imports"| "remove_unused" | "remove_unused_imports")[]
 ---@field include_completions_with_insert_text boolean
@@ -118,6 +119,11 @@ function M.load_settings(settings)
       { "number", "string" },
       true,
     },
+    ["settings.tsserver_locale"] = {
+      settings.tsserver_locale,
+      "string",
+      true,
+    },
     ["settings.complete_function_calls"] = { settings.complete_function_calls, "boolean", true },
     ["settings.expose_as_code_action"] = {
       settings.expose_as_code_action,
@@ -163,6 +169,10 @@ function M.load_settings(settings)
     __store.tsserver_max_memory = "auto"
   end
 
+  if not settings.tsserver_locale then
+    __store.tsserver_locale = "en"
+  end
+
   if not settings.complete_function_calls then
     __store.complete_function_calls = false
   end

lua/typescript-tools/process.lua

@@ -41,7 +41,7 @@ function Process.new(type, on_response, on_exit)
     self.args = {
       tsserver_provider:get_executable_path():absolute(),
       "--stdio",
-      "--local", "en",
+      "--locale", plugin_config.tsserver_locale,
       "--useInferredProjectPerProjectRoot",
       "--validateDefaultNpmLocation",
       "--noGetErrOnBackgroundUpdate",