Closing browser tab?

[beyond9thousand]

How do you implement closing of the tab that is opened when previewing the file? I am looking to implement something similar on an nvim command that I am working on.

vim.api.nvim_create_autocmd("UILeave", {
	callback = function()
		table.foreachi(_G.RETYPE_JOBS or {}, function(_, job)
			job:shutdown()
			vim.loop.kill(job.pid)
		end)
	end,
	pattern = "*retype.yml",
	desc = "Kill all retype jobs.",
})

vim.api.nvim_create_user_command("RetypeWatch", function()
	if _G.RETYPE_JOBS then
		local SIGKILL = 9
		table.foreachi(_G.RETYPE_JOBS, function(_, job)
			job:shutdown()
			vim.loop.kill(job.pid, SIGKILL)
		end)
		_G.RETYPE_JOBS = nil
		return
	end

	local path = vim.fn.bufname()
	if vim.fn.fnamemodify(path, ":t") == "retype.yml" then
		local retype = require("plenary.job"):new({
			"retype",
			"watch",
			cwd = vim.fn.fnamemodify(path, ":h"),
		})
		retype:start()
		_G.RETYPE_JOBS = _G.RETYPE_JOBS and table.insert(_G.RETYPE_JOBS, retype) or { retype }
	end
end, {})

currently this only terminates the yarn module that is retype
i want it to mimic the browser tab killing behavior, what could i do to incorporate the same?