window:leader_is_active()

Returns true if the Leader Key is active in the window, or false otherwise.

This example shows LEADER in the right status area, and turns the cursor orange, when the leader is active:

lua

local wezterm = require 'wezterm'

wezterm.on('update-right-status', function(window, pane)
  local leader = ''
  if window:leader_is_active() then
    leader = 'LEADER'
  end
  window:set_right_status(leader)
end)

return {
  leader = { key = 'a', mods = 'CTRL' },
  colors = {
    compose_cursor = 'orange',
  },
}