EMA crossover- tradescript

Is it possible to know before crossover with the help of code ?

​like, buy script; CROSSOVER(EMA(CLOSE, ?), EMA(CLOSE, ?))​

  1. How one can know before crossover ?!

  2. CLOSE >= CROSSOVER(EMA(CLOSE, ?), EMA(CLOSE, ?) + 1) ​i coded right for the above ?!!

It is not possible to guess or get plotted to generate alert before crossover of any indicator or EMA , it may have repainting of candle issues or wrong signals also.

you may use lesser value or time frame which you want to use to, but i guess it also may generate noice or false signals

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Thnx. Please help to interpret below for knowledge ;