Function: timeframe()
timeframe(
tf,bars?):Htf
Declare a higher timeframe of the chart symbol ("15" "60" "240" "D", up
to 1 day, "W" from Monday, "M" a calendar month). Call at module top
level, at most 10 contexts per script. It must be an exact multiple of the
chart timeframe (max 1500x), else every value is na (with a warning in
the log). bars = how many HTF bars of history you need
(drives warmup loading).
Parameters
tf
string
bars?
i32 = 0