Get all data from an slicer using powerbi-client js library, not only selected values

thank you 

That's right I also tried this but it didn't work

I think powerbi library is not too much clear about what we can do as a developers. After several testing I found a function that can help to grab data from the slicer, it can be used to try to pre-validate what you want to send against slicer data and avoid having non existing values.  

// Retrieve the page collection and get the visuals for the active page.
try {
    const pages = await report.getPages();

    // Retrieve the page that contain the visual. For the sample report it will be the active page
    let page = pages.filter(function (page) {
        return page.isActive
    })[0];

    const visuals = await page.getVisuals();

    // Retrieve the target visual.
    let visual = visuals.filter(function (visual) {
        return visual.name === "VisualContainer4";
    })[0];

    const result = await visual.exportData(models.ExportDataType.Summarized);
    console.log(result.data);
}
catch (errors) {
    console.log(errors);
}