Function applyContextWindow

src/utils/output.ts:577–594

(lines: SnapshotDiffLine[], contextWindow: number)

}

function applyContextWindow(lines: SnapshotDiffLine[], contextWindow: number): SnapshotDiffLine[] {
  if (lines.length === 0) return lines;
  const changedIndices = lines
    .map((line, index) => ({ index, kind: line.kind }))
    .filter((entry) => entry.kind === 'added' || entry.kind === 'removed')
    .map((entry) => entry.index);
  if (changedIndices.length === 0) return lines;

  const keep = new Array<boolean>(lines.length).fill(false);
  for (const index of changedIndices) {
    const start = Math.max(0, index - contextWindow);
    const end = Math.min(lines.length - 1, index + contextWindow);
    for (let i = start; i <= end; i += 1) {
      keep[i] = true;
    }
  }
  return lines.filter((_, index) => keep[index]);
}

export function supportsColor(stream: { isTTY?: boolean } = process.stdout): boolean {
  const forceColor = process.env.FORCE_COLOR;