@itwin/presentation-hierarchies/lib/esm/hierarchies/internal/operators/TapOnce.js

A package for creating hierarchies based on data in iTwin.js iModels.

/*---------------------------------------------------------------------------------------------
 * Copyright (c) Bentley Systems, Incorporated. All rights reserved.
 * See LICENSE.md in the project root for license terms and full copyright notice.
 *--------------------------------------------------------------------------------------------*/
import { tap } from "rxjs";
/** @internal */
export function tapOnce(observer) {
    let first = true;
    return (source) => source.pipe(tap(() => {
        if (first) {
            first = false;
            observer();
        }
    }));
}
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