How to run in a Node.js environment?

[小七]

The generated canvas is empty！！！

code：

const paper = require("paper");

const { createCanvas } = require("canvas");

// Create a canvas and set the size

const canvas = createCanvas(800, 600);

// Set the canvas to be the active layer

paper.setup(canvas);

// Create a circle shape

const circle = new paper.Path.Circle({

    center: [400, 300],

    radius: 50,

    fillColor: "red",

});

// Create a square shape

const square = new paper.Path.Rectangle({

    point: [300, 200],

    size: [100, 100],

    fillColor: "blue",

});

// export img

const fs = require("fs");

const out = fs.createWriteStream(__dirname + "/test.png");

const stream = canvas.createPNGStream();

stream.pipe(out);

out.on("finish", () => console.log("The PNG file was created."));