require('luasnip.session.snippet_collection').clear_snippets('lua')

local ls = require('luasnip')
local s = ls.snippet
local i = ls.insert_node
local fmt = require('luasnip.extras.fmt').fmt

ls.add_snippets('lua', {
    s('fu', fmt('function {}({})\n    {}\nend', { i(1), i(2), i(0) })),
})