Function getStackFrames

lib/internal/util/inspect.js:1764–1808

(ctx, err, stack)

}

function getStackFrames(ctx, err, stack) {
  const frames = StringPrototypeSplit(stack, '\n');

  let cause;
  try {
    ({ cause } = err);
  } catch {
    // If 'cause' is a getter that throws, ignore it.
  }

  // Remove stack frames identical to frames in cause.
  if (cause != null && isError(cause)) {
    const causeStack = getStackString(ctx, cause);
    const causeStackStart = StringPrototypeIndexOf(causeStack, '\n    at');
    if (causeStackStart !== -1) {
      const causeFrames = StringPrototypeSplit(StringPrototypeSlice(causeStack, causeStackStart + 1), '\n');
      const { 0: len, 1: offset } = identicalSequenceRange(frames, causeFrames);
      if (len > 0) {
        const skipped = len - 2;
        const msg = `    ... ${skipped} lines matching cause stack trace ...`;
        frames.splice(offset + 1, skipped, ctx.stylize(msg, 'undefined'));
      }
    }
  }

  // Remove recursive repetitive stack frames in long stacks
  if (frames.length > 10) {
    const ranges = getDuplicateErrorFrameRanges(frames);

    for (let i = ranges.length - 3; i >= 0; i -= 3) {
      const offset = ranges[i];
      const length = ranges[i + 1];
      const duplicateRanges = ranges[i + 2];

      const msg = `    ... collapsed ${length * duplicateRanges} duplicate lines ` +
        'matching above ' +
        (duplicateRanges > 1 ?
          `${length} lines ${duplicateRanges} times...` :
          'lines ...');
      frames.splice(offset, length * duplicateRanges, ctx.stylize(msg, 'undefined'));
    }
  }

  return frames;
}

/** @type {(stack: string, constructor: string | null, name: unknown, tag: string) => string} */
function improveStack(stack, constructor, name, tag) {