【TypeScript】TypeScriptでNode.jsを使ってCSVを読み込む

TypeScriptでCSVを読み込みたかったのでメモ。
TypeScriptとかクラスとか全然知らないけど，とりあえず読めればいいや的な扱いで。

sample.csv

var1,var2,var3
val11,val21,val31
val12,val22,val32
val13,val23,val33
val14,val24,val34
val15,val25,val35

read_csv.ts

import * as fs from 'fs';
import csvSync = require('csv-parse/lib/sync');

class DataProcess {
    // Read CSV as 2-D list.
    static readCsv(input: string) {
        const data = fs.readFileSync(input);
        const matrix = csvSync(data);
        return matrix;
    } 
}

// Run.
const csv = DataProcess.readCsv('./sample.csv');
console.log(csv);

tsc read_csv.ts
node read_csv.js

[ [ 'var1', 'var2', 'var3' ],
  [ 'val11', 'val21', 'val31' ],
  [ 'val12', 'val22', 'val32' ],
  [ 'val13', 'val23', 'val33' ],
  [ 'val14', 'val24', 'val34' ],
  [ 'val15', 'val25', 'val35' ] ]