FlowscopeDocs

S019

alert constructor outside an alert declaration

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Severity Error

alert(...) does not create a value you can pass around; it only declares an alert, and it is allowed solely as the right-hand side of an alert declaration. Using it in setup, in a local or inside a handler is rejected.

Declare the alert at the top level with alert name = alert(...) and call name.trigger() from a handler.

Failing example

Flowscope Script
script "Funding flip"
data funding = subscribe(data.funding)
setup flip = alert(title: "Funding changed sign", onClose: true)
on funding.close {
  let now = funding.rate ?? 0.0
  let before = funding.rate[1] ?? 0.0
  if now * before < 0.0 {
    flip.trigger()
  }
}

Fixed example

Flowscope Script
script "Funding flip"
data funding = subscribe(data.funding)
alert flip = alert(title: "Funding changed sign", onClose: true)
on funding.close {
  let now = funding.rate ?? 0.0
  let before = funding.rate[1] ?? 0.0
  if now * before < 0.0 {
    flip.trigger()
  }
}