artesanias/node_modules/rxjs/_esm2015/internal/observable/merge.js

import { Observable } from '../Observable';
import { isScheduler } from '../util/isScheduler';
import { mergeAll } from '../operators/mergeAll';
import { fromArray } from './fromArray';
export function merge(...observables) {
    let concurrent = Number.POSITIVE_INFINITY;
    let scheduler = null;
    let last = observables[observables.length - 1];
    if (isScheduler(last)) {
        scheduler = observables.pop();
        if (observables.length > 1 && typeof observables[observables.length - 1] === 'number') {
            concurrent = observables.pop();
        }
    }
    else if (typeof last === 'number') {
        concurrent = observables.pop();
    }
    if (scheduler === null && observables.length === 1 && observables[0] instanceof Observable) {
        return observables[0];
    }
    return mergeAll(concurrent)(fromArray(observables, scheduler));
}
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