@naturalcycles/nodejs-lib/dist/stream/csv/transformToCSV.js

Standard library for Node.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const csvStringify = require("csv-stringify/lib/sync");
const stream_1 = require("stream");
/**
 * Transforms objects (objectMode=true) into chunks \n-terminated JSON strings (readableObjectMode=false).
 */
function transformToCSV(opt = {}) {
    const { strict = true } = opt;
    let { header } = opt;
    return new stream_1.Transform({
        objectMode: true,
        readableObjectMode: false,
        transform(chunk, _encoding, cb) {
            try {
                const str = csvStringify([chunk], {
                    ...opt,
                    header,
                });
                header = false;
                cb(null, str);
            }
            catch (err) {
                console.error(err);
                if (strict) {
                    cb(err); // emit error
                }
                else {
                    cb(); // emit no error, but no result neither
                }
            }
        },
    });
}
exports.transformToCSV = transformToCSV;
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