Okay this seem to be the way

async function copyText(nodeA: TextNode, nodeB: any) {

    // @ts-ignore - Load all fonts used in the range

    let allFontNames = nodeA.getRangeAllFontNames(0, nodeA.characters.length);

    await Promise.all(allFontNames.map(figma.loadFontAsync));



    // // copy Characters

    nodeB.characters = nodeA.characters;



    let prop = [

        "fontSize",

        "fontName",

        "textStyleId",

        "fontWeight",

        "textDecoration",

        "textCase",

        "lineHeight",

        "letterSpacing",

        "listOptions",

        "indentation",

        "hyperlink",

        "fills",

        "fillStyleId",

    ];



    //@ts-ignore - get range details

    let segments = nodeA.getStyledTextSegments(prop);



    // loop over the range and set the font details

    segments.forEach((seg: any) => {

        nodeB.setRangeFontSize(seg.start, seg.end, seg.fontSize);

        nodeB.setRangeFontName(seg.start, seg.end, seg.fontName);

        nodeB.setRangeHyperlink(seg.start, seg.end, seg.hyperlink);

        nodeB.setRangeListOptions(seg.start, seg.end, seg.listOptions);

        nodeB.setRangeIndentation(seg.start, seg.end, seg.indentation);



        if (seg.textStyleId) {

            nodeB.setRangeTextStyleId(seg.start, seg.end, seg.textStyleId);

        } else {

            nodeB.getRangeFontWeight(seg.start, seg.end, seg.fontWeight);

            nodeB.setRangeTextDecoration(seg.start, seg.end, seg.textDecoration);

            nodeB.setRangeTextCase(seg.start, seg.end, seg.textCase);

            nodeB.setRangeLineHeight(seg.start, seg.end, seg.lineHeight);

            nodeB.setRangeLetterSpacing(seg.start, seg.end, seg.letterSpacing);

        }



        seg.fillStyleId

            ? nodeB.setRangeFillStyleId(seg.start, seg.end, seg.fillStyleId)

            : nodeB.setRangeFills(seg.start, seg.end, seg.fills);

    });

}