.dotfiles/nvim/after/plugin/signature_help.lua

local signature, _ = pcall(function()
  return require("lsp_signature")
end);

if signature then
  signature.setup({
    -- set to true to enable debug logging
    debug = false,

    -- log dir when debug is on
    -- default is  ~/.cache/nvim/lsp_signature.log
    log_path = vim.fn.stdpath("cache") .. "/lsp_signature.log",

    -- show debug line number
    verbose = false,

    -- This is mandatory, otherwise border config won't get registered.
    -- If you want to hook lspsaga or other signature handler, pls set to false
    bind = true,

    -- will show two lines of comment/doc(if there are more than two lines in doc, will be truncated);
    -- set to 0 if you DO NOT want any API comments be shown
    -- This setting only take effect in insert mode, it does not affect signature help in normal
    -- mode, 10 by default
    doc_lines = 0,

    -- max height of signature floating_window
    max_height = 12,

    -- max_width of signature floating_window, line will be wrapped if exceed max_width
    -- the value need >= 40
    max_width = 80,

    -- allow doc/signature text wrap inside floating_window, useful if your lsp return doc/sig is too long
    wrap = true,

    -- show hint in a floating window, set to false for virtual text only mode
    floating_window = true,

    -- try to place the floating above the current line when possible Note:
    -- will set to true when fully tested, set to false will use whichever side has more space
    -- this setting will be helpful if you do not want the PUM and floating win overlap
    floating_window_above_cur_line = true,

    -- adjust float windows x position.
    -- can be either a number or function
    floating_window_off_x = 0,

    -- adjust float windows y position. e.g -2 move window up 2 lines; 2 move down 2 lines
    -- can be either number or function, see examples
    floating_window_off_y = 0,

    -- close floating window after ms when laster parameter is entered
    close_timeout = 4000,

    -- set to true, the floating window will not auto-close until finish all parameters
    fix_pos = false,

    -- virtual hint enable
    hint_enable = true,

    -- Panda for parameter, NOTE: for the terminal not support emoji, might crash
    -- or, provide a table with 3 icons
    -- hint_prefix = {
    --     above = "↙ ",  -- when the hint is on the line above the current line
    --     current = "← ",  -- when the hint is on the same line
    --     below = "↖ "  -- when the hint is on the line below the current line
    -- }
    hint_prefix = "🐼 ",

    hint_scheme = "String",

    -- should the hint be inline(nvim 0.10 only)?  default false
    -- return true | 'inline' to show hint inline, return 'eol' to show hint at end of line, return false to disable
    -- return 'right_align' to display hint right aligned in the current line
    hint_inline = function() return false end,

    -- how your parameter will be highlight
    hi_parameter = "LspSignatureActiveParameter",

    handler_opts = {
      -- double, rounded, single, shadow, none, or a table of borders
      border = "rounded"
    },

    -- sometime show signature on new line or in middle of parameter can be confusing, set it to false for #58
    always_trigger = false,

    -- autoclose signature float win after x sec, disabled if nil.
    auto_close_after = nil,

    -- Array of extra characters that will trigger signature completion, e.g., {"(", ","}
    extra_trigger_chars = {},

    -- by default it will be on top of all floating windows, set to <= 50 send it to bottom
    zindex = 200,

    -- character to pad on left and right of signature can be ' ', or '|'  etc
    padding = '',

    -- disabled by default, allow floating win transparent value 1~100
    transparency = nil,

    -- if you using shadow as border use this set the opacity
    shadow_blend = 36,

    -- if you using shadow as border use this set the color e.g. 'Green' or '#121315'
    shadow_guibg = 'Black',

    -- default timer check interval set to lower value if you want to reduce latency
    timer_interval = 50,

    -- toggle signature on and off in insert mode,  e.g. toggle_key = '<M-x>'
    toggle_key = nil,

    -- true: toggle floating_windows: true|false setting after toggle key pressed
    -- false: floating_windows setup will not change, toggle_key will pop up signature helper, but signature
    -- may not popup when typing depends on floating_window setting
    toggle_key_flip_floatwin_setting = false,

    -- cycle to next signature, e.g. '<M-n>' function overloading
    select_signature_key = nil,

    -- imap, use nvim_set_current_win to move cursor between current win and floating window
    -- e.g. move_cursor_key = '<M-p>',
    -- once moved to floating window, you can use <M-d>, <M-u> to move cursor up and down
    move_cursor_key = nil,

    -- relate to move_cursor_key; the keymaps inside floating window
    -- e.g. keymaps = { 'j', '<C-o>j' } this map j to <C-o>j in floating window
    -- <M-d> and <M-u> are default keymaps to move cursor up and down
    keymaps = {}
  })
end