rxjs-retry-delay/dist/retry-delay.operator.js

RxJS retry pipeable operator with delay and max attempts strategy for RxJS >= 6

import { throwError, timer } from 'rxjs';
import { finalize, mergeMap as switchMap, retryWhen, tap } from 'rxjs/operators';
export const retryWithDelay = ({ delay = 1000, maxRetryAttempts = 3, scalingFactor = 1, excludedStatusCodes = [], resetRetryCountOnEmission = false }) => (source) => {
    let retryAttempts = 0;
    return source.pipe(retryWhen((attempts) => {
        return attempts.pipe(switchMap((error) => {
            // if maximum number of retries have been met
            // or response is a status code we don't wish to retry, throw error
            if (++retryAttempts > maxRetryAttempts || excludedStatusCodes.find((e) => e === error.status)) {
                return throwError(error);
            }
            const tryAfter = delay * Math.pow(scalingFactor, (retryAttempts - 1));
            console.log(`Attempt ${retryAttempts}: retrying in ${tryAfter}ms`);
            // retry after 1s, 2s, etc...
            return timer(tryAfter);
        }), finalize(() => console.log('Done with retrying.')));
    }), tap(() => {
        if (resetRetryCountOnEmission) {
            retryAttempts = 0;
        }
    }));
};
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