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class ScrollQueue { private resolve: (() => void) | null = null; private promise: Promise<any> | null = null; add() { this.promise = new Promise((resolve) => { this.resolve = resolve; }); } flush() { this.resolve && this.resolve(); this.resolve = null; this.promise = null; } async wait() { await this.promise; } } export const scrollWaiter = new ScrollQueue();