docx-js/src/file/drawing/extent/extent.ts

import { XmlComponent } from "file/xml-components";
import { ExtentAttributes } from "./extent-attributes";

export class Extent extends XmlComponent {
    private readonly attributes: ExtentAttributes;

    constructor(x: number, y: number) {
        super("wp:extent");

        this.attributes = new ExtentAttributes({
            cx: x,
            cy: y,
        });

        this.root.push(this.attributes);
    }

    public setXY(x: number, y: number): void {
        this.attributes.set({
            cx: x,
            cy: y,
        });
    }
}