xhr.onload = function()

in www/browser/FileTransfer.js [278:321]
3 lines of code
5 McCabe index (conditional complexity)

    xhr.onload = function (e) {
        const fileNotFound = function () {
            fail(FileTransferError.FILE_NOT_FOUND_ERR);
        };

        const req = e.target;
        // req.status === 0 is special case for local files with file:// URI scheme
        if ((req.status === 200 || req.status === 0) && req.response) {
            window.resolveLocalFileSystemURL(
                getParentPath(target),
                function (dir) {
                    dir.getFile(
                        getFileName(target),
                        { create: true },
                        function writeFile (entry) {
                            entry.createWriter(function (fileWriter) {
                                fileWriter.onwriteend = function (evt) {
                                    if (!evt.target.error) {
                                        entry.filesystemName = entry.filesystem.name;
                                        delete transfers[that._id];
                                        if (successCallback) {
                                            successCallback(entry);
                                        }
                                    } else {
                                        fail(FileTransferError.FILE_NOT_FOUND_ERR);
                                    }
                                };
                                fileWriter.onerror = function () {
                                    fail(FileTransferError.FILE_NOT_FOUND_ERR);
                                };
                                fileWriter.write(req.response);
                            }, fileNotFound);
                        },
                        fileNotFound
                    );
                },
                fileNotFound
            );
        } else if (req.status === 404) {
            fail(FileTransferError.INVALID_URL_ERR, req.status, req.response);
        } else {
            fail(FileTransferError.CONNECTION_ERR, req.status, req.response);
        }
    };