ReactComponentStackFrame.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 {disableLogs, reenableLogs} from 'shared/ConsolePatchingDev';

import ReactSharedInternals from 'shared/ReactSharedInternals';

import DefaultPrepareStackTrace from 'shared/DefaultPrepareStackTrace';

import {formatOwnerStack} from './ReactOwnerStackFrames';

let prefix;
let suffix;
export function describeBuiltInComponentFrame(name: string): string {
  if (prefix === undefined) {
    // Extract the VM specific prefix used by each line.
    try {
      throw Error();
    } catch (x) {
      const match = x.stack.trim().match(/\n( *(at )?)/);
      prefix = (match && match[1]) || '';
      suffix =
        x.stack.indexOf('\n    at') > -1
          ? // V8
            ' (<anonymous>)'
          : // JSC/Spidermonkey
            x.stack.indexOf('@') > -1
            ? '@unknown:0:0'
            : // Other
              '';
    }
  }
  // We use the prefix to ensure our stacks line up with native stack frames.
  return '\n' + prefix + name + suffix;
}

export function describeDebugInfoFrame(
  name: string,
  env: ?string,
  location: ?Error,
): string {
  if (location != null) {
    // If we have a location, it's the child's owner stack. Treat the bottom most frame as
    // the location of this function.
    const childStack = formatOwnerStack(location);
    const idx = childStack.lastIndexOf('\n');
    const lastLine = idx === -1 ? childStack : childStack.slice(idx + 1);
    if (lastLine.indexOf(name) !== -1) {
      // For async stacks it's possible we don't have the owner on it. As a precaution only
      // use this frame if it has the name of the function in it.
      return '\n' + lastLine;
    }
  }

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