fix(lsp): fix some type annotations (#22397)

3 files changed, 25 insertions, 12 deletions

diff --git a/runtime/lua/vim/lsp/protocol.lua b/runtime/lua/vim/lsp/protocol.lua
index 12345b6c8c..41dfc9e00e 100644
--- a/runtime/lua/vim/lsp/protocol.lua
+++ b/runtime/lua/vim/lsp/protocol.lua
@@ -20,14 +20,6 @@ function transform_schema_to_table()
 end
 --]=]
 
----@class lsp.ShowMessageRequestParams
----@field type lsp.MessageType
----@field message string
----@field actions nil|lsp.MessageActionItem[]
-
----@class lsp.MessageActionItem
----@field title string
-
 local constants = {
   DiagnosticSeverity = {
     -- Reports an error.
@@ -60,6 +52,7 @@ local constants = {
   },
 
   -- The file event type.
+  ---@enum lsp.FileChangeType
   FileChangeType = {
     -- The file got created.
     Created = 1,
diff --git a/runtime/lua/vim/lsp/rpc.lua b/runtime/lua/vim/lsp/rpc.lua
index f1492601ff..aa833deb99 100644
--- a/runtime/lua/vim/lsp/rpc.lua
+++ b/runtime/lua/vim/lsp/rpc.lua
@@ -319,9 +319,9 @@ end
 ---
 ---@param method (string) The invoked LSP method
 ---@param params (table|nil) Parameters for the invoked LSP method
----@param callback (function) Callback to invoke
+---@param callback fun(err: lsp.ResponseError|nil, result: any) Callback to invoke
 ---@param notify_reply_callback (function|nil) Callback to invoke as soon as a request is no longer pending
----@returns (bool, number) `(true, message_id)` if request could be sent, `false` if not
+---@return boolean success, integer|nil request_id true, request_id if request could be sent, `false` if not
 function Client:request(method, params, callback, notify_reply_callback)
   validate({
     callback = { callback, 'f' },
@@ -538,9 +538,9 @@ local function public_client(client)
   ---
   ---@param method (string) The invoked LSP method
   ---@param params (table|nil) Parameters for the invoked LSP method
-  ---@param callback (function) Callback to invoke
+  ---@param callback fun(err: lsp.ResponseError | nil, result: any) Callback to invoke
   ---@param notify_reply_callback (function|nil) Callback to invoke as soon as a request is no longer pending
-  ---@returns (bool, number) `(true, message_id)` if request could be sent, `false` if not
+  ---@return boolean success, integer|nil request_id true, message_id if request could be sent, `false` if not
   function result.request(method, params, callback, notify_reply_callback)
     return client:request(method, params, callback, notify_reply_callback)
   end
diff --git a/runtime/lua/vim/lsp/types.lua b/runtime/lua/vim/lsp/types.lua
new file mode 100644
index 0000000000..1aea6841ee
--- /dev/null
+++ b/runtime/lua/vim/lsp/types.lua
@@ -0,0 +1,20 @@
+---@meta
+
+---@alias lsp-handler fun(err: lsp.ResponseError|nil, result: any, context: table, config: table|nil)
+
+---@class lsp.ResponseError
+---@field code integer
+---@field message string
+---@field data string|number|boolean|table[]|table|nil
+
+---@class lsp.ShowMessageRequestParams
+---@field type lsp.MessageType
+---@field message string
+---@field actions nil|lsp.MessageActionItem[]
+
+---@class lsp.MessageActionItem
+---@field title string
+
+---@class lsp.FileEvent
+---@field uri string
+---@field type lsp.FileChangeType