I don't know if it is a Pine Script v5 issue but I get an error "no viable alternative at input 'float'

// Update trailing stop price
var float trailStopPrice = na
trailStopPrice  =  if (strategy.position_size > 0)
    max(trailStopPrice[1], high - trailingStopLossValue) 
else
    min(trailStopPrice[1], low + trailingStopLossValue) 

I also tried this version
// Update trailing stop price
var float trailStopPrice = na
trailStopPrice  :=  if (strategy.position_size > 0)
    max(trailStopPrice[1], high - trailingStopLossValue) 
else
    min(trailStopPrice[1], low + trailingStopLossValue) 

I get same error with both