3 files changed, 96 insertions, 51 deletions

diff --git a/runtime/lua/vim/_meta/api.lua b/runtime/lua/vim/_meta/api.lua
index 3c9b9d4f44..acd12b353d 100644
--- a/runtime/lua/vim/_meta/api.lua
+++ b/runtime/lua/vim/_meta/api.lua
@@ -1012,7 +1012,7 @@ function vim.api.nvim_create_namespace(name) end
 --- ```
 ---
 --- @param name string Name of the new user command. Must begin with an uppercase letter.
---- @param command any Replacement command to execute when this user command is executed. When called
+--- @param command string|fun(args: vim.api.keyset.create_user_command.command_args) Replacement command to execute when this user command is executed. When called
 --- from Lua, the command can also be a Lua function. The function is called with a
 --- single table argument that contains the following keys:
 --- - name: (string) Command name
diff --git a/runtime/lua/vim/_meta/api_keysets.lua b/runtime/lua/vim/_meta/api_keysets.lua
index bf184dee2d..e11dddb2d3 100644
--- a/runtime/lua/vim/_meta/api_keysets.lua
+++ b/runtime/lua/vim/_meta/api_keysets.lua
@@ -4,11 +4,11 @@
 error('Cannot require a meta file')
 
 --- @class vim.api.keyset.buf_attach
---- @field on_lines? function
---- @field on_bytes? function
---- @field on_changedtick? function
---- @field on_detach? function
---- @field on_reload? function
+--- @field on_lines? fun(_: "lines", bufnr: integer, changedtick: integer, first: integer, last_old: integer, last_new: integer, byte_count: integer, deleted_codepoints?: integer, deleted_codeunits?: integer): boolean?
+--- @field on_bytes? fun(_: "bytes", bufnr: integer, changedtick: integer, start_row: integer, start_col: integer, start_byte: integer, old_end_row: integer, old_end_col: integer, old_end_byte: integer, new_end_row: integer, new_end_col: integer, new_end_byte: integer): boolean?
+--- @field on_changedtick? fun(_: "changedtick", bufnr: integer, changedtick: integer)
+--- @field on_detach? fun(_: "detach", bufnr: integer)
+--- @field on_reload? fun(_: "reload", bufnr: integer)
 --- @field utf_sizes? boolean
 --- @field preview? boolean
 
@@ -18,9 +18,9 @@ error('Cannot require a meta file')
 
 --- @class vim.api.keyset.clear_autocmds
 --- @field buffer? integer
---- @field event? any
---- @field group? any
---- @field pattern? any
+--- @field event? string|string[]
+--- @field group? integer|string
+--- @field pattern? string|string[]
 
 --- @class vim.api.keyset.cmd
 --- @field cmd? string
@@ -28,12 +28,12 @@ error('Cannot require a meta file')
 --- @field count? integer
 --- @field reg? string
 --- @field bang? boolean
---- @field args? any[]
+--- @field args? string[]
 --- @field magic? table<string,any>
 --- @field mods? table<string,any>
---- @field nargs? any
---- @field addr? any
---- @field nextcmd? any
+--- @field nargs? integer|string
+--- @field addr? string
+--- @field nextcmd? string
 
 --- @class vim.api.keyset.cmd_magic
 --- @field file? boolean
@@ -72,20 +72,20 @@ error('Cannot require a meta file')
 --- @field info? string
 
 --- @class vim.api.keyset.context
---- @field types? any[]
+--- @field types? string[]
 
 --- @class vim.api.keyset.create_augroup
---- @field clear? any
+--- @field clear? boolean
 
 --- @class vim.api.keyset.create_autocmd
 --- @field buffer? integer
---- @field callback? any
+--- @field callback? string|(fun(args: vim.api.keyset.create_autocmd.callback_args): boolean?)
 --- @field command? string
 --- @field desc? string
---- @field group? any
+--- @field group? integer|string
 --- @field nested? boolean
 --- @field once? boolean
---- @field pattern? any
+--- @field pattern? string|string[]
 
 --- @class vim.api.keyset.echo_opts
 --- @field verbose? boolean
@@ -103,19 +103,19 @@ error('Cannot require a meta file')
 
 --- @class vim.api.keyset.exec_autocmds
 --- @field buffer? integer
---- @field group? any
+--- @field group? integer|string
 --- @field modeline? boolean
---- @field pattern? any
+--- @field pattern? string|string[]
 --- @field data? any
 
 --- @class vim.api.keyset.exec_opts
 --- @field output? boolean
 
 --- @class vim.api.keyset.get_autocmds
---- @field event? any
---- @field group? any
---- @field pattern? any
---- @field buffer? any
+--- @field event? string|string[]
+--- @field group? integer|string
+--- @field pattern? string|string[]
+--- @field buffer? integer|integer[]
 
 --- @class vim.api.keyset.get_commands
 --- @field builtin? boolean
@@ -154,17 +154,17 @@ error('Cannot require a meta file')
 --- @field altfont? boolean
 --- @field nocombine? boolean
 --- @field default? boolean
---- @field cterm? any
---- @field foreground? any
---- @field fg? any
---- @field background? any
---- @field bg? any
---- @field ctermfg? any
---- @field ctermbg? any
---- @field special? any
---- @field sp? any
---- @field link? any
---- @field global_link? any
+--- @field cterm? integer|string
+--- @field foreground? integer|string
+--- @field fg? integer|string
+--- @field background? integer|string
+--- @field bg? integer|string
+--- @field ctermfg? integer|string
+--- @field ctermbg? integer|string
+--- @field special? integer|string
+--- @field sp? integer|string
+--- @field link? integer|string
+--- @field global_link? integer|string
 --- @field fallback? boolean
 --- @field blend? integer
 --- @field fg_indexed? boolean
@@ -201,7 +201,7 @@ error('Cannot require a meta file')
 --- @field wins? any[]
 
 --- @class vim.api.keyset.open_term
---- @field on_input? function
+--- @field on_input? fun(_: "input", term: integer, bufnr: integer, data: any)
 --- @field force_crlf? boolean
 
 --- @class vim.api.keyset.option
@@ -227,20 +227,20 @@ error('Cannot require a meta file')
 --- @field do_source? boolean
 
 --- @class vim.api.keyset.set_decoration_provider
---- @field on_start? function
---- @field on_buf? function
---- @field on_win? function
---- @field on_line? function
---- @field on_end? function
---- @field _on_hl_def? function
---- @field _on_spell_nav? function
+--- @field on_start? fun(_: "start", tick: integer)
+--- @field on_buf? fun(_: "buf", bufnr: integer, tick: integer)
+--- @field on_win? fun(_: "win", winid: integer, bufnr: integer, toprow: integer, botrow: integer)
+--- @field on_line? fun(_: "line", winid: integer, bufnr: integer, row: integer)
+--- @field on_end? fun(_: "end", tick: integer)
+--- @field _on_hl_def? fun(_: "hl_def")
+--- @field _on_spell_nav? fun(_: "spell_nav")
 
 --- @class vim.api.keyset.set_extmark
 --- @field id? integer
 --- @field end_line? integer
 --- @field end_row? integer
 --- @field end_col? integer
---- @field hl_group? number|string
+--- @field hl_group? integer|string
 --- @field virt_text? any[]
 --- @field virt_text_pos? string
 --- @field virt_text_win_col? integer
@@ -258,10 +258,10 @@ error('Cannot require a meta file')
 --- @field virt_lines_leftcol? boolean
 --- @field strict? boolean
 --- @field sign_text? string
---- @field sign_hl_group? number|string
---- @field number_hl_group? number|string
---- @field line_hl_group? number|string
---- @field cursorline_hl_group? number|string
+--- @field sign_hl_group? integer|string
+--- @field number_hl_group? integer|string
+--- @field line_hl_group? integer|string
+--- @field cursorline_hl_group? integer|string
 --- @field conceal? string
 --- @field spell? boolean
 --- @field ui_watched? boolean
@@ -292,7 +292,7 @@ error('Cannot require a meta file')
 --- @field relative? string
 --- @field split? string
 --- @field win? integer
---- @field bufpos? any[]
+--- @field bufpos? integer[]
 --- @field external? boolean
 --- @field focusable? boolean
 --- @field mouse? boolean
@@ -315,12 +315,12 @@ error('Cannot require a meta file')
 --- @field end_vcol? integer
 
 --- @class vim.api.keyset.xdl_diff
---- @field on_hunk? function
+--- @field on_hunk? fun(start_a: integer, count_a: integer, start_b: integer, count_b: integer): integer?
 --- @field result_type? string
 --- @field algorithm? string
 --- @field ctxlen? integer
 --- @field interhunkctxlen? integer
---- @field linematch? any
+--- @field linematch? boolean|integer
 --- @field ignore_whitespace? boolean
 --- @field ignore_whitespace_change? boolean
 --- @field ignore_whitespace_change_at_eol? boolean
diff --git a/runtime/lua/vim/_meta/api_keysets_extra.lua b/runtime/lua/vim/_meta/api_keysets_extra.lua
index 81bce50746..e8e901acb2 100644
--- a/runtime/lua/vim/_meta/api_keysets_extra.lua
+++ b/runtime/lua/vim/_meta/api_keysets_extra.lua
@@ -73,6 +73,51 @@ error('Cannot require a meta file')
 --- @field buflocal? boolean
 --- @field buffer? integer
 
+--- @class vim.api.keyset.create_autocmd.callback_args
+--- @field id integer autocommand id
+--- @field event string name of the triggered event |autocmd-events|
+--- @field group? integer autocommand group id, if any
+--- @field match string expanded value of <amatch>
+--- @field buf integer expanded value of <abuf>
+--- @field file string expanded value of <afile>
+--- @field data? any arbitrary data passed from |nvim_exec_autocmds()|                       *event-data*
+
+--- @class vim.api.keyset.create_user_command.command_args
+--- @field name string Command name
+---
+--- The args passed to the command, if any <args>
+--- @field args string
+---
+--- The args split by unescaped whitespace
+--- (when more than one argument is allowed), if any <f-args>
+--- @field fargs string[]
+---
+--- Number of arguments |:command-nargs|
+--- @field nargs string
+---
+--- "true" if the command was executed with a ! modifier <bang>
+--- @field bang boolean
+---
+--- The starting line of the command range <line1>
+--- @field line1 integer
+---
+--- The final line of the command range <line2>
+--- @field line2 integer
+---
+--- The number of items in the command range: 0, 1, or 2 <range>
+--- @field range integer
+---
+--- Any count supplied <count>
+--- @field count integer
+--- The optional register, if specified <reg>
+--- @field reg string
+--- Command modifiers, if any <mods>
+--- @field mods string
+---
+--- Command modifiers in a structured format. Has the same structure as the
+--- "mods" key of |nvim_parse_cmd()|.
+--- @field smods table
+
 --- @class vim.api.keyset.command_info
 --- @field name string
 --- @field definition string