Encountering a tslint issue: "Parsing error: Expression expected"

Could someone provide some insight on this issue?

I’m encountering an error message that says

Failed to compile. Parsing error: Expression expected
with this specific line of code -

isLogViewVisible: dashboard?.logView !== null
where the variable isLogViewVisible is of type boolean

interface IDashboard {
  logView: ILogView
}

interface ILogView {
  history: string
}

let dashboard: IDashboard | null;
let logView: ILogView | null;

const someVariable = {
  isLogViewVisible: dashboard?.logView !== null
}

Answer №1

; is used for terminating a statement, while = is utilized for assignment (and === indicates equality):

isUserLoggedIn = auth.currentUser?.isLoggedIn === true

Alternatively, if you prefer to specify the type explicitly (though unnecessary in this case as it's easily inferred):

const isUserLoggedIn: boolean = auth.currentUser?.isLoggedIn === true

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