Draw a rectangle with pixi.js

There is a nice way to do this using PIXI.Texture.WHITE.

const rectangle = PIXI.Sprite.from(PIXI.Texture.WHITE);
rectangle.width = 300;
rectangle.height = 200;
rectangle.tint = 0xFF0000;
stage.addChild(rectangle);

Geometries are not renderable, they are for doing geometric calculations.

Source @xerver

So we have to use PIXI.Graphics()

You can't render geometry (Pixi.Rectangle), they are meant for calculations only. You can do the following instead:

var graphics = new PIXI.Graphics();

graphics.beginFill(0xFFFF00);

// set the line style to have a width of 5 and set the color to red
graphics.lineStyle(5, 0xFF0000);

// draw a rectangle
graphics.drawRect(0, 0, 300, 200);

stage.addChild(graphics);

^source