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local M = {}
--- Capture `fn`'s upvalues and pass to `delegate`
---@param delegate fun(env: table<string, any>, _: ...): ...
---@param fn function
---@return fun(...): ...
function M.new(delegate, fn)
local upvalues = {}
for i = 1, debug.getinfo(fn, "u").nups do
local name, value = debug.getupvalue(fn, i)
upvalues[name] = value
end
return function(...)
return delegate(upvalues, ...)
end
end
return setmetatable(M, {
__call = function(_, ...)
return M.new(...)
end,
})
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