@virtualstate/app-history/src/event-target/parallel-event.ts

Native JavaScript [app-history](https://github.com/WICG/app-history) implementation

import { Event, isEvent } from "./event"

export interface ParallelEvent<Name extends string | symbol = string> extends Event<Name> {
    parallel: true | undefined
}

export function isParallelEvent(value: object): value is ParallelEvent {
    return isEvent(value) && value.parallel !== false
}