@sentry/utils/esm/buildPolyfills/_nullishCoalesce.js

Utilities for all Sentry JavaScript SDKs

/**
 * 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();
//   }
// }

export { _nullishCoalesce };
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