@virtualstate/app-history/esnext/event-target/event.js

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

export function isEvent(value) {
    function isLike(value) {
        return !!value;
    }
    return isLike(value) && (typeof value.type === "string" ||
        typeof value.type === "symbol");
}
export function assertEvent(value, type) {
    if (!isEvent(value)) {
        throw new Error("Expected event");
    }
    if (typeof type !== "undefined" && value.type !== type) {
        throw new Error(`Expected event type ${type}, got ${value.type.toString()}`);
    }
}
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