@instana/collector/src/util/removeCircular.js

The Instana Node.js metrics and trace data collector

/*
 * (c) Copyright IBM Corp. 2021
 * (c) Copyright Instana Inc. and contributors 2019
 */

'use strict';

/**
 * @returns {(key: string, value: *) => *}
 */
module.exports = function createCircularReferencesRemover() {
  const seen = new WeakSet();
  return (_key, value) => {
    if (typeof value === 'object' && value !== null) {
      if (seen.has(value)) {
        return;
      }
      seen.add(value);
    }
    return value;
  };
};