Type Alias ExtractCSVHeader<CSVSource, Delimiter, Quotation, Nl, Escaping>

ExtractCSVHeader: ExtractString<CSVSource> extends `${infer Header}${Newline}${ExtractCSVBody<
    CSVSource,
    Delimiter,
    Quotation,
    Nl,
    Escaping,
>}`
    ? Header
    : ExtractString<CSVSource>

Extract a CSV header string from a CSVString.

Type Parameters

CSVSource extends CSVString
Delimiter extends string = DEFAULT_DELIMITER
Quotation extends string = DEFAULT_QUOTATION
Nl extends string = Exclude<Newline, Delimiter | Quotation>
Escaping extends boolean = false

Example: Default

const csv = `name,age
Alice,42
Bob,69`;

type _ = ExtractCSVHeader<typeof csv>
// "name,age"

Example: With different delimiter and quotation

const csv = `name@$a
ge$
$Ali
ce$@42
Bob@69`;

type _ = ExtractCSVHeader<typeof csv, "@", "$">
// "name@$a\nge$"