Resize Zone

class Example extends Phaser.Scene
{
    create ()
    {
        const zone = this.add.zone(100, 100, 32, 32).setDropZone();

        //  Just a visual display of the drop zone
        const graphics = this.add.graphics();

        let color = 0xffff00;

        graphics.lineStyle(2, color);
        graphics.strokeRect(zone.x + zone.input.hitArea.x, zone.y + zone.input.hitArea.y, zone.input.hitArea.width, zone.input.hitArea.height);

        this.input.setPollAlways();

        // this.input.on('dragenter', function (pointer, gameObject, dropZone) {
        this.input.on('gameobjectover', (pointer, gameObject, dropZone) =>
        {

            color = 0x00ffff;

        });

        // this.input.on('dragleave', function (pointer, gameObject, dropZone) {
        this.input.on('gameobjectout', (pointer, gameObject, dropZone) =>
        {

            color = 0xffff00;

        });

        this.tweens.add({
            targets: zone,
            width: 400,
            height: 200,
            duration: 3000,
            ease: 'Sine.easeInOut',
            yoyo: true,
            repeat: -1,
            onUpdate: function ()
            {
                zone.setSize(zone.width, zone.height, true);
                graphics.clear();
                graphics.lineStyle(2, color);
                graphics.strokeRect(zone.x + zone.input.hitArea.x, zone.y + zone.input.hitArea.y, zone.input.hitArea.width, zone.input.hitArea.height);
            }

        });
    }
}

const config = {
    scale: { mode: Phaser.Scale.FIT },
    type: Phaser.WEBGL,
    parent: 'game-container',
    width: 800,
    height: 600,
    scene: Example
};

const game = new Phaser.Game(config);