docx-js/src/file/paragraph/run/run-components/text.ts

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

class TextAttributes extends XmlAttributeComponent<{ space: "default" | "preserve" }> {
    protected xmlKeys = { space: "xml:space" };
}

export class Text extends XmlComponent {
    constructor(text: string) {
        super("w:t");
        this.root.push(new TextAttributes({ space: "preserve" }));
        if (text) {
            this.root.push(text);
        }
    }
}