The Effect.Console timer functions are stubbed out. time, timeLog and timeEnd all raise "Sorry, console timers aren't implemented yet" and ignore their label argument (src/Effect/Console.lua). On the JS backend these map to console.time(label) / console.timeLog(label) / console.timeEnd(label): a named timer keyed by the label string, used to measure elapsed time.

This issue tracks giving them a real implementation. The lint noise from the unused label was already handled in #64 by renaming the parameter to _s; this is the follow-up feature work.

Sketch

Keep a module-level table of start times keyed by label and read the clock on each call:

local timers = {}
-- time(label):    timers[label] = os.clock()
-- timeLog(label): print(label .. ": " .. (os.clock() - timers[label]) * 1000 .. "ms")
-- timeEnd(label): same as timeLog, then timers[label] = nil

Caveat to decide

Stock Lua 5.1 has no millisecond wall-clock. os.clock returns CPU seconds, not wall time, and os.time is whole seconds. So the output cannot match the JS console.time semantics exactly. Options: accept os.clock (CPU time) and document the divergence, depend on a wall-clock source like socket.gettime where available, or keep the stubs and close this as won't-fix. The right call depends on whether downstream code relies on these for real timing or just for parity with the JS API surface.