Merge remote-tracking branch 'origin/dev' into dev

aijinhui

2024-04-15 dae6e068207ad1bff32dafd8c71f12d8a2a59aa2

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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>;