问上传json/shp/kml/kmz文件并将其转换为geojson

EN

<input type="file" name="uploadfile" accept=".json,.geojson,.shp,.kml,.kmz" id="file_loader" hidden>

<input type="text" id="upload_name" placeholder="Name" aria-label="Name" >

var jsonObj;

var fileExt = upload_name.split('.').pop();           // Get file extension

var reader = new FileReader();                        // Read file into text
reader.readAsText($('#file_loader')[0].files[0]);
reader.onload = function(event) {
    if (fileExt == 'geojson')  {
        jsonObj = JSON.parse(event.target.result);    // Parse text into json
    } else if (fileExt == 'shp') {
        // how to convert event.target.result to geojson?
    } else if (fileExt == 'json') {
        // 
    } else if (fileExt == 'kml') {
        //
    } else if (fileExt == 'kmz') {
        //
    }
}

function addToMap(){
    // This function add jsonObj as a layer to Mapbox
    // No problem here
}

Could not find a declaration file for module 'gtran'