papaparseでPromiseを使う(TypeScriptも有)

基本の書き方

Papa.parse(file, {
  complete: function(results) {
    console.log("Finished:", results.data);
  }
});

Promise使って書く

function readCsv(file) {
  return new Promise((resolve, reject) => {
    Papa.parse(file, {
      complete: (results) => {
        resolve(results.data);
      }
    });
  });
}

readCsv("./hoge.csv").then(res => {
  console.log(res);
});

TypeScriptで書く

import { parse } from "papaparse";

function readCsv(file: string) {
  return new Promise<string>((resolve, reject) => {
    parse(file, {
      complete: (results: any) => {
        resolve(results.data);
      }
    });
  });
}

readCsv("./hoge.csv").then(res => {
  console.log(res);
});

参考

• Papa Parse
• How to use Promises with PapaParse?