docx-js/src/file/drawing/inline/graphic/graphic-data/pic/blip/blip.ts

import { XmlAttributeComponent, XmlComponent } from "file/xml-components";

interface IBlipProperties {
    embed: string;
}

class BlipAttributes extends XmlAttributeComponent<IBlipProperties> {
    protected xmlKeys = {
        embed: "r:embed",
    };
}

export class Blip extends XmlComponent {

    constructor(referenceId: number) {
        super("a:blip");
        this.root.push(new BlipAttributes({
            embed: `rId${referenceId}`,
        }));
    }
}