```typescript
/**
 * Splits a CSV line into its fields on commas.
 *
 * A field wrapped in double quotes may contain commas, and a doubled quote inside such a field means one literal quote character;
 * the surrounding quotes are not part of the value. Fields that are not quoted are taken literally, including any surrounding spaces.
 * An empty line is one empty field.
 */
export function parseCsvLine(line: string): string[] {
    const result: string[] = [];
    let currentField = '';
    let inQuote = false;

    for (const char of line) {
        if (char === '"') {
            inQuote = !inQuote;
        } else if (!inQuote && char === ',') {
            if (currentField) {
                result.push(currentField);
                currentField = '';
            }
        } else if (!inQuote) {
            currentField += char;
        } else {
            throw new Error("Unbalanced quote at the end of the line");
        }
    }

    if (currentField) {
        result.push(currentField);
    }

    return result.filter((field) => field !== '');
}
```