typescript - 获取 tslint 错误：`解析错误：预期表达式`

Question

有人可以帮我解释一下吗？

我正在接受Failed to compile. Parsing error: Expression expected这条线 -

isLogViewVisible: dashboard?.logView !== nullisLogViewVisible在哪里boolean

interface IDashboard {
  logView: ILogView
}

interface ILogView {
  history: string
}

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


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

标签： typescript

Answer 1

:用于类型信息，=用于赋值（和===相等）：

isLogViewVisible = state.dashboard?.logView === null

或者如果你想让类型显式（在这里没用，它很容易推断）：

const isLogViewVisible: boolean = state.dashboard?.logView === null