caminho/dist/esm/operators/reduce.js

Tool for creating efficient data pipelines in a JavaScript environment

import { map, reduce as reduceRxJs } from 'rxjs';
import { getNewValueBag } from '../utils/valueBag';
import { pick } from '../utils/pick';
export function reduce(reduceParams, loggers, pendingDataControl) {
    const { provides, keep, seed } = reduceParams;
    const immutableSeed = Object.freeze(seed);
    let lastBag = {};
    function wrappedReduce(acc, valueBag, index, runId) {
        const startedAt = new Date();
        loggers.onStepStarted([valueBag]);
        const renewedAcc = index === 0 ? structuredClone(immutableSeed) : acc;
        try {
            const reduceResult = reduceParams.fn(renewedAcc, valueBag, index);
            loggers.onStepFinished([valueBag], startedAt);
            lastBag = valueBag;
            return reduceResult;
        }
        catch (err) {
            loggers.onStepFinished([valueBag], startedAt, err);
            throw err;
        }
        finally {
            pendingDataControl?.decrement(runId);
        }
    }
    return function operatorApplierWithRunId(runId) {
        return function operatorApplier(observable) {
            return observable
                .pipe(reduceRxJs((acc, valueBag, index) => wrappedReduce(acc, valueBag, index, runId), seed))
                .pipe(map((reduceResult) => {
                pendingDataControl?.increment(runId);
                return getNewValueBag(pick(lastBag, keep ?? []), provides, reduceResult);
            }));
        };
    };
}
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