事件

EventOptions

ctx.on() 和 ctx.once() 接受的选项。

/** Options accepted by `ctx.on()` and `ctx.once()`. */
interface EventOptions {
  /** Add the listener before existing listeners for the same event. */
  prepend?: boolean
  /** Receive the event regardless of context filter checks. */
  global?: boolean
}

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DispatchMode

事件服务使用的事件分发策略。

emit 运行同步监听器但不等待它们，parallel 同时等待所有监听器，serial 依次等待监听器直至其中一个提前终止分发，bail 遇到第一个同步提前终止值时停止，waterfall 则围绕最终的 next 回调组合监听器。

/**
 * Event dispatch strategy used by the event service.
 *
 * `emit` runs synchronous listeners without awaiting them, `parallel` awaits
 * all listeners together, `serial` awaits them in order until one bails,
 * `bail` stops on the first synchronous bail value, and `waterfall` composes
 * listeners around a final `next` callback.
 */
type DispatchMode = 'emit' | 'parallel' | 'serial' | 'bail' | 'waterfall'

源码