core/src/Export/CsvColumn.php

<?php

namespace Modules\Core\Export;

use Closure;

/**
 * One column in a CsvWriter schema: a header label plus a closure that pulls this
 * column's value out of one record. The closure doesn't care what shape a record
 * is — an array, an Eloquent model, a DTO — so the same CsvWriter serves any
 * domain (GDPR export, an admin catalog export, an accounting export) by simply
 * being handed a different column schema and a different row source.
 */
final class CsvColumn
{
    /**
     * @param Closure(mixed):((string|int|float|null)) $value
     */
    public function __construct(
        public readonly string $header,
        public readonly Closure $value,
    ) {}
}