Function serializeColWidthsComment

packages/app-core/src/lib/markdown-table.ts:240–246

(
  widths: ReadonlyArray<number | null> | undefined
)

/** Serialize per-column widths to a `<!-- zen:cols=… -->` line, or null when no
 *  column has an explicit width (so an un-resized table emits no comment). */
export function serializeColWidthsComment(
  widths: ReadonlyArray<number | null> | undefined
): string | null {
  if (!widths || !widths.some((w) => typeof w === 'number' && w > 0)) return null
  const parts = widths.map((w) => (typeof w === 'number' && w > 0 ? String(Math.round(w)) : 'auto'))
  return `<!-- zen:cols=${parts.join(',')} -->`
}

// ---------------------------------------------------------------------------
// Structural operations — all return a new table, never mutate the input.