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Can you make this parser preserve empty fields?

Split on the delimiter first, then normalize each position without filtering it:

export function parseRow(line: string) {
    return line.split(',').map((field) => field.trim())
}

split(',') keeps empty positions, so alpha,,gamma becomes ['alpha', '', 'gamma'].

Which edge cases should stay outside this helper?

Keep quoting and schema validation separate from this positional split:

Reject an unexpected field count at the boundary.
Send quoted delimiters through a CSV-aware tokenizer.
Preserve empty strings here so required-field validation can name the exact column.

Give me one regression test for the original bug.

This catches the disappearing middle field directly:

expect(parseRow('north,,active')).toEqual([
    'north',
    '',
    'active',
])