Read file method

config.js

// mirage/config.js - Adding a method for reading the file

function readFile(file) {
  let reader = new FileReader();

  return new Promise((resolve, reject) => {
    reader.onerror = () => {
      reject(new Error('There was an error reading the file!'));
    };
    reader.onload = () => resolve(reader.result);
    reader.readAsText(file);
  });
}