Barbecue

-- Lua
require('barbecue').setup {
  -- ... your barbecue config
  theme = 'tokyonight',
  -- ... your barbecue config
}

Lualine

-- Lua
require('lualine').setup {
  options = {
    -- ... your lualine config
    theme = 'tokyonight'
    -- ... your lualine config
  }
}

Lightline

" Vim Script
let g:lightline = {'colorscheme': 'tokyonight'}

---@class tokyonight.Config
---@field on_colors fun(colors: ColorScheme)
---@field on_highlights fun(highlights: tokyonight.Highlights, colors: ColorScheme)
M.defaults = {
  style = "moon", -- The theme comes in three styles, `storm`, a darker variant `night` and `day`
  light_style = "day", -- The theme is used when the background is set to light
  transparent = false, -- Enable this to disable setting the background color
  terminal_colors = true, -- Configure the colors used when opening a `:terminal` in Neovim
  styles = {
    -- Style to be applied to different syntax groups
    -- Value is any valid attr-list value for `:help nvim_set_hl`
    comments = { italic = true },
    keywords = { italic = true },
    functions = {},
    variables = {},
    -- Background styles. Can be "dark", "transparent" or "normal"
    sidebars = "dark", -- style for sidebars, see below
    floats = "dark", -- style for floating windows
  },
  day_brightness = 0.3, -- Adjusts the brightness of the colors of the **Day** style. Number between 0 and 1, from dull to vibrant colors
  dim_inactive = false, -- dims inactive windows
  lualine_bold = false, -- When `true`, section headers in the lualine theme will be bold

  --- You can override specific color groups to use other groups or a hex color
  --- function will be called with a ColorScheme table
  ---@param colors ColorScheme
  on_colors = function(colors) end,

  --- You can override specific highlights to use other groups or a hex color
  --- function will be called with a Highlights and ColorScheme table
  ---@param highlights tokyonight.Highlights
  ---@param colors ColorScheme
  on_highlights = function(highlights, colors) end,

  cache = true, -- When set to true, the theme will be cached for better performance

  ---@type table<string, boolean|{enabled:boolean}>
  plugins = {
    -- enable all plugins when not using lazy.nvim
    -- set to false to manually enable/disable plugins
    all = package.loaded.lazy == nil,
    -- uses your plugin manager to automatically enable needed plugins
    -- currently only lazy.nvim is supported
    auto = true,
    -- add any plugins here that you want to enable
    -- for all possible plugins, see:
    --   * https://github.com/folke/tokyonight.nvim/tree/main/lua/tokyonight/groups
    -- telescope = true,
  },
}

require("tokyonight").setup({
  -- use the night style
  style = "night",
  -- disable italic for functions
  styles = {
    functions = {}
  },
  -- Change the "hint" color to the "orange" color, and make the "error" color bright red
  on_colors = function(colors)
    colors.hint = colors.orange
    colors.error = "#ff0000"
  end
})

require("tokyonight").setup({
  on_highlights = function(hl, c)
    local prompt = "#2d3149"
    hl.TelescopeNormal = {
      bg = c.bg_dark,
      fg = c.fg_dark,
    }
    hl.TelescopeBorder = {
      bg = c.bg_dark,
      fg = c.bg_dark,
    }
    hl.TelescopePromptNormal = {
      bg = prompt,
    }
    hl.TelescopePromptBorder = {
      bg = prompt,
      fg = prompt,
    }
    hl.TelescopePromptTitle = {
      bg = prompt,
      fg = prompt,
    }
    hl.TelescopePreviewTitle = {
      bg = c.bg_dark,
      fg = c.bg_dark,
    }
    hl.TelescopeResultsTitle = {
      bg = c.bg_dark,
      fg = c.bg_dark,
    }
  end,
})

To have undercurls show up and in color, add the following to your Tmux configuration file:

# Undercurl
set -g default-terminal "${TERM}"
set -as terminal-overrides ',*:Smulx=\E[4::%p1%dm'  # undercurl support
set -as terminal-overrides ',*:Setulc=\E[58::2::::%p1%{65536}%/%d::%p1%{256}%/%{255}%&%d::%p1%{255}%&%d%;m'  # underscore colours - needs tmux-3.0