om/node_modules/rxjs/_esm2015/internal/observable/concat.js

import { isScheduler } from '../util/isScheduler';
import { of } from './of';
import { from } from './from';
import { concatAll } from '../operators/concatAll';
export function concat(...observables) {
    if (observables.length === 1 || (observables.length === 2 && isScheduler(observables[1]))) {
        return from(observables[0]);
    }
    return concatAll()(of(...observables));
}
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