How to use the proj4.default.toPoint function in proj4

const reproject = (point, source, dest, normalize = true) => {
    const sourceProj = source && Proj4js.defs(source) ? new Proj4js.Proj(source) : null;
    const destProj = dest && Proj4js.defs(dest) ? new Proj4js.Proj(dest) : null;
    if (sourceProj && destProj) {
        let p = isArray(point) ? Proj4js.toPoint(point) : Proj4js.toPoint([point.x, point.y]);

        const transformed = assign({}, source === dest ? numberize(p) : Proj4js.transform(sourceProj, destProj, numberize(p)), {srs: dest});
        if (normalize) {
            return normalizePoint(transformed);
        }
        return transformed;
    }
    return null;
};