code_snippet_4 for "Playing Mortal Kombat with TensorFlow.js. Transfer learning and data augmentation" translation

code_snippet_4.js

const punches = require('fs')
  .readdirSync(Punches)
  .filter(f => f.endsWith('.jpg'))
  .map(f => `${Punches}/${f}`);
const others = require('fs')
  .readdirSync(Others)
  .filter(f => f.endsWith('.jpg'))
  .map(f => `${Others}/${f}`);
const ys = tf.tensor1d(
  new Array(punches.length).fill(1)
    .concat(new Array(others.length).fill(0)));
const xs: tf.Tensor2D = tf.stack(
  punches
    .map((path: string) => mobileNet(readInput(path)))
    .concat(others.map((path: string) => mobileNet(readInput(path))))
) as tf.Tensor2D;