faster-csv/dist/formatter.js

Minimal dependency, fast CSV parser and formatter using modern Node.js APIs.

import { createWriteStream } from "node:fs";
export async function formatCSV(outputPath, rows, { headers = true, separator = "," } = {}) {
    const stream = createWriteStream(outputPath, { encoding: "utf-8" });
    if (headers && rows.length > 0 && !Array.isArray(rows[0])) {
        stream.write(Object.keys(rows[0]).join(separator) + "\n");
    }
    for (const row of rows) {
        const line = Array.isArray(row)
            ? row.join(separator)
            : Object.values(row).join(separator);
        stream.write(line + "\n");
    }
    stream.end();
}