readLocalFile.js

fetchCsv() {
        var rawFile = new XMLHttpRequest();
        rawFile.open("GET", require("path/to/local/file.txt"), false);
        rawFile.onreadystatechange = () => {
            if (rawFile.readyState === 4) {
                if (rawFile.status === 200 || rawFile.status === 0) {
                    var allText = rawFile.responseText;

                    Papa.parse(allText, {
                        complete: this.setData, // in this case, set the text as react state
                        skipEmptyLines: true
                    });
                }
            }
        };
        rawFile.send(null);
    }