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// https://github.com/alangpierce/sucrase/tree/265887868966917f3b924ce38dfad01fbab1329f
//
// The MIT License (MIT)
//
// Copyright (c) 2012-2018 various contributors (see AUTHORS)
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

/**
 * Polyfill for the nullish coalescing operator (`??`).
 *
 * Note that the RHS is wrapped in a function so that if it's a computed value, that evaluation won't happen unless the
 * LHS evaluates to a nullish value, to mimic the operator's short-circuiting behavior.
 *
 * Adapted from Sucrase (https://github.com/alangpierce/sucrase)
 *
 * @param lhs The value of the expression to the left of the `??`
 * @param rhsFn A function returning the value of the expression to the right of the `??`
 * @returns The LHS value, unless it's `null` or `undefined`, in which case, the RHS value
 */
function _nullishCoalesce(lhs, rhsFn) {
  // by checking for loose equality to `null`, we catch both `null` and `undefined`
  return lhs != null ? lhs : rhsFn();
}

// Sucrase version:
// function _nullishCoalesce(lhs, rhsFn) {
//   if (lhs != null) {
//     return lhs;
//   } else {
//     return rhsFn();
//   }
// }

exports._nullishCoalesce = _nullishCoalesce;
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