Function hasMetaData

src/math-json/utils.ts:82–91

(
  expr: MathJsonExpression | null
)

 * with a non-undefined value.
 */
export function hasMetaData(
  expr: MathJsonExpression | null
): expr is ExpressionObject & Partial<MathJsonAttributes> {
  return (
    isExpressionObject(expr) &&
    ((expr as MathJsonAttributes).latex !== undefined ||
      (expr as MathJsonAttributes).wikidata !== undefined ||
      (expr as MathJsonAttributes).sourceOffsets !== undefined)
  );
}

/**  If expr is a string literal, return it.
 *