FlowscopeDocs

N003

null needs an explicit type

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Severity Error

A bare null was used where no type can be inferred from context, for example state peak = null or let x = null. The compiler cannot tell whether it is meant to be a float?, a time? or something else.

Add a type annotation (state peak: float? = null), or use the null where the expected type is known, such as a typed parameter or the other branch of a ternary.

Failing example

Flowscope Script
script "Swing memory"
data chart = subscribe(data.ohlcv)
state lastPivot = null
plot level = plot.line(title: "Last pivot high", style: linestyle.step)
on chart.close {
  let p = ta.pivotHigh(chart.high, 3, 3)
  if p != null {
    lastPivot = p
  }
  level.plot(lastPivot)
}

Fixed example

Flowscope Script
script "Swing memory"
data chart = subscribe(data.ohlcv)
state lastPivot: float? = null
plot level = plot.line(title: "Last pivot high", style: linestyle.step)
on chart.close {
  let p = ta.pivotHigh(chart.high, 3, 3)
  if p != null {
    lastPivot = p
  }
  level.plot(lastPivot)
}