@webex/common/dist/tap.js

Common utilities for Cisco Webex

"use strict";

var _Object$defineProperty = require("@babel/runtime-corejs2/core-js/object/define-property");
var _interopRequireDefault = require("@babel/runtime-corejs2/helpers/interopRequireDefault");
_Object$defineProperty(exports, "__esModule", {
  value: true
});
exports.default = tap;
var _promise = _interopRequireDefault(require("@babel/runtime-corejs2/core-js/promise"));
/*!
 * Copyright (c) 2015-2020 Cisco Systems, Inc. See LICENSE file.
 */

/**
 * Injects code into a promise chain without modifying the promise chain's result
 * @param {Function} fn
 * @returns {Promise}
 * @example
 * function f() {
 *   return Promise.resolve(5);
 * }
 *
 * f()
 *   .then(tap(() => 12))
 *   // => 5
 */
function tap(fn) {
  return function (r) {
    return new _promise.default(function (resolve) {
      resolve(fn(r));
    }).then(function () {
      return r;
    }).catch(function () {
      return r;
    });
  };
}
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