reader.onloadend = function()

in www/browser/FileTransfer.js [146:208]
3 lines of code
1 McCabe index (conditional complexity)

                    reader.onloadend = function () {
                        const blob = new Blob([this.result], { type: mimeType });

                        // Prepare form data to send to server
                        const fd = new FormData();
                        fd.append(fileKey, blob, fileName);
                        for (const prop in params) {
                            if (Object.prototype.hasOwnProperty.call(params, prop)) {
                                fd.append(prop, params[prop]);
                            }
                        }

                        xhr.open(httpMethod, server);

                        // Fill XHR headers
                        for (const header in headers) {
                            if (Object.prototype.hasOwnProperty.call(headers, header)) {
                                xhr.setRequestHeader(header, headers[header]);
                            }
                        }

                        xhr.onload = function () {
                            // 2xx codes are valid
                            if (this.status >= 200 && this.status < 300) {
                                const result = new FileUploadResult();
                                result.bytesSent = blob.size;
                                result.responseCode = this.status;
                                result.response = this.response;
                                delete transfers[that._id];
                                successCallback(result);
                            } else if (this.status === 404) {
                                fail(FileTransferError.INVALID_URL_ERR, this.status, this.response);
                            } else {
                                fail(FileTransferError.CONNECTION_ERR, this.status, this.response);
                            }
                        };

                        xhr.ontimeout = function () {
                            fail(FileTransferError.CONNECTION_ERR, this.status, this.response);
                        };

                        xhr.onerror = function () {
                            fail(FileTransferError.CONNECTION_ERR, this.status, this.response);
                        };

                        xhr.onabort = function () {
                            fail(FileTransferError.ABORT_ERR, this.status, this.response);
                        };

                        xhr.upload.onprogress = function (e) {
                            if (that.onprogress) {
                                that.onprogress(e);
                            }
                        };

                        xhr.send(fd);
                        // Special case when transfer already aborted, but XHR isn't sent.
                        // In this case XHR won't fire an abort event, so we need to check if transfers record
                        // isn't deleted by filetransfer.abort and if so, call XHR's abort method again
                        if (!transfers[that._id]) {
                            xhr.abort();
                        }
                    };