Merge remote-tracking branch 'origin/master'

aijinhui

2023-10-21 8cb8a874db01acd1113cfeb5c2c5bf7e9555ff65

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import { OperatorFunction, MonoTypeOperatorFunction } from '../types';
export declare function defaultIfEmpty<T>(defaultValue?: T): MonoTypeOperatorFunction<T>;
export declare function defaultIfEmpty<T, R>(defaultValue?: R): OperatorFunction<T, T | R>;