formatOwnerStack() — react Function Reference

Source Code

packages/react-devtools-shared/src/backend/shared/DevToolsOwnerStack.js lines 12–46

export function formatOwnerStack(error: Error): string {
  const prevPrepareStackTrace = Error.prepareStackTrace;
  // $FlowFixMe[incompatible-type] It does accept undefined.
  Error.prepareStackTrace = undefined;
  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.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;
}