input.js

let inputDirection = {x: 0, y: 0};
let lastInputDirection = {x: 0, y:0}

window.addEventListener('keydown', e => {
    switch (e.key) {
        case 'ArrowUp':
            if (lastInputDirection.y !== 0) 
                break;
            inputDirection = {x: 0, y: -1}
            break;
        case 'ArrowDown':
            if (lastInputDirection.y !== 0)
                break;
            inputDirection = {x: 0, y: 1}
            break;
        case 'ArrowLeft':
            if (lastInputDirection.x !== 0)
                break;
            inputDirection = {x: -1, y: 0}
            break;
        case 'ArrowRight':
            if (lastInputDirection.x !== 0)
                break;
            inputDirection = {x: 1, y: 0}
            break;
    }
})

export function getInputDirection()
{
    lastInputDirection = inputDirection;
    return(inputDirection);
}