Lambda image resize APIGateway

lambda.ts

import { APIGatewayEvent, Context, Callback } from 'aws-lambda';
import * as Jimp from 'jimp';

export async function resize(
  event: APIGatewayEvent,
  context: Context,
  callback: Callback
) {
  const image = await Jimp.read(event.queryStringParameters.src);
  await image.cover(Number(event.queryStringParameters.w), Number(event.queryStringParameters.h));
  image.getBuffer(Jimp.MIME_JPEG, (err, buffer: Buffer) => {
    callback(null, {
      statusCode: 200,
      headers: { 'Content-Type': 'image/jpeg' },
      body: buffer.toString('base64')
    });
  });
}