Merge remote-tracking branch 'origin/master'

Tcsm

2023-05-27 3c0b2d339126e2cb57cb25616a7bc3c9e52c11df

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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>;