@wordpress/block-library/build-module/table/utils.js

Block library for the WordPress editor.

/**
 * Normalize the rowspan/colspan value.
 * Returns undefined if the parameter is not a positive number
 * or the default value (1) for rowspan/colspan.
 *
 * @param {number|undefined} rowColSpan rowspan/colspan value.
 *
 * @return {string|undefined} normalized rowspan/colspan value.
 */
export function normalizeRowColSpan(rowColSpan) {
  const parsedValue = parseInt(rowColSpan, 10);
  if (!Number.isInteger(parsedValue)) {
    return undefined;
  }
  return parsedValue < 0 || parsedValue === 1 ? undefined : parsedValue.toString();
}
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