ReactOwnerStackFrames.js — react Source File

Source Code

/**
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * @flow
 */

import DefaultPrepareStackTrace from 'shared/DefaultPrepareStackTrace';

export function formatOwnerStack(error: Error): string {
  const prevPrepareStackTrace = Error.prepareStackTrace;
  Error.prepareStackTrace = DefaultPrepareStackTrace;
  let stack = error.stack;
  Error.prepareStackTrace = prevPrepareStackTrace;
  if (stack.startsWith('Error: react-stack-top-frame\n')) {
    // V8's default formatting prefixes with the error message which we
    // don't want/need.
    stack = stack.slice(29);
  }
  let idx = stack.indexOf('\n');
  if (idx !== -1) {
    // Pop the JSX frame.
    stack = stack.slice(idx + 1);
  }
  idx = stack.indexOf('react_stack_bottom_frame');
  if (idx !== -1) {
    idx = stack.lastIndexOf('\n', idx);
  }
  if (idx !== -1) {
    // Cut off everything after the bottom frame since it'll be internals.
    stack = stack.slice(0, idx);
  } else {
    // We didn't find any internal callsite out to user space.
    // This means that this was called outside an owner or the owner is fully internal.
    // To keep things light we exclude the entire trace in this case.
    return '';
  }
  return stack;
}