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This function returns a boolean indicating whether we believe that we are running in a Windows Services for Linux (WSL) container. In such an environment the wezterm.target_triple will indicate that we are running in Linux but there will be some slight differences in system behavior (such as filesystem capabilities) that you may wish to probe for in the configuration.

local wezterm = require 'wezterm'
  'System '
    .. wezterm.target_triple
    .. ' '
    .. tostring(wezterm.running_under_wsl())