CLI Snake with nodejs chalk and keypress

snake.mjs

import chalk from 'chalk';
import keypress from 'keypress';

// npm i chalk keypress

keypress(process.stdin);

const width = process.stdout.columns;
const height = process.stdout.rows - 1;

let snake = [{ x: Math.floor(width / 2), y: Math.floor(height / 2) }];
let food = { x: Math.floor(Math.random() * width), y: Math.floor(Math.random() * height) };
let direction = 'right';
let speed = 100;

const hideCursor = () => {
  process.stdout.write('\x1b[?25l');
};

const showCursor = () => {
  process.stdout.write('\x1b[?25h');
};

const draw = (x, y, color) => {
  process.stdout.write(`\x1b[${y + 1};${x + 1}H${color(' ')}`);
};

const move = () => {
  let newX = snake[0].x;
  let newY = snake[0].y;

  switch (direction) {
    case 'up':
      newY--;
      break;
    case 'down':
      newY++;
      break;
    case 'left':
      newX--;
      break;
    case 'right':
      newX++;
      break;
  }

  if (
    newX < 0 ||
    newY < 0 ||
    newX >= width ||
    newY >= height ||
    snake.slice(1).some((part) => part.x === newX && part.y === newY)
  ) {
    clearInterval(gameLoop);
    showCursor();
    console.log(chalk.red('Game over!'));
    process.exit(0);
  }

  // Clear tail
  const tail = snake.pop();
  draw(tail.x, tail.y, chalk.reset);

  // Move head
  snake.unshift({ x: newX, y: newY });
  draw(newX, newY, chalk.bgGreen);

  // Check for food
  if (newX === food.x && newY === food.y) {
    // Extend snake
    snake.push(tail);

    // Generate new food
    food.x = Math.floor(Math.random() * width);
    food.y = Math.floor(Math.random() * height);
    speed *= 0.9;

    // Draw new food
    draw(food.x, food.y, chalk.bgRed);
  }
};

process.stdin.on('keypress', (ch, key) => {
  if (key && key.ctrl && key.name === 'c') {
    showCursor();
    process.exit();
  }

  switch (key.name) {
    case 'up':
    case 'down':
      if (direction !== 'up' && direction !== 'down') {
        direction = key.name;
      }
      break;
    case 'left':
    case 'right':
      if (direction !== 'left' && direction !== 'right') {
        direction = key.name;
      }
      break;
  }
});

process.stdin.setRawMode(true);
process.stdin.resume();

hideCursor();

// Draw initial state
draw(snake[0].x, snake[0].y, chalk.bgGreen);
draw(food.x, food.y, chalk.bgRed);

const gameLoop = setInterval(move, speed);