Write a file with Typescript 3.x and node 10.x fs/promises

writeJSON.ts

import { promises as fs } from 'fs';
import { EOL } from 'os';

export class SomeClass {

  async asyncFileWriteJSON<T>(listOfObjects: Array<T>, filename: string): Promise<void> {
    try {
      if (listOfObjects && listOfObjects.length > 0) {
        const file = filename;
        let fd = await fs.open(file, 'w');
        await fd.appendFile('[');

        for (let index = 0; index < listOfObjects.length; index++) {
          if (index === listOfObjects.length - 1) {
            await fd.appendFile(`${JSON.stringify(listOfObjects[index])}${EOL}`);
          } else {
            await fd.appendFile(`${JSON.stringify(listOfObjects[index])},${EOL}`);
          }
        }

        await fd.appendFile(']');
        await fd.sync();
        await fd.close();
      }
    } catch (error) {
      console.log('ouch');
    }
  }
}