how to append to log file

Hi megahertz,

when my electron app restarts, it’s overriding the old log file. I want append the new logging data to the old log file. How can I do this?

I’m using ubuntu 14.04.

here is my code:

const electron = require('electron');
const log = require('electron-log');
const app = electron.app;
const ipcMain = electron.ipcMain;
...
log.transports.file.level = 'debug';
log.transports.file.maxSize = 15 * 1024 * 1024;
log.transports.file.file = __dirname + '/app.log';
log.transports.file.streamConfig = { flags: 'w' };
log.transports.file.stream = fs.createWriteStream(log.transports.file.file);
log.transports.console.level = 'debug';
...
app.on('ready', function() {
    log.info('start app');
...
}

I read this: “Modifying a file rather than replacing it may require a flags mode of r+ rather than the default mode w” at: https://nodejs.org/api/fs.html#fs_fs_createwritestream_path_options

and tried this:

log.transports.file.streamConfig = { flags: 'r+' };

and ‘a’ too

but it dosn’t solved the problem. What have I to do, to make it work?

Thank you for your help

[SebastianDettmann]

@pbmzero I did it in this way:

log.transports.file.stream = fs.createWriteStream(log.transports.file.file, { flags: 'a' });

in your case, maybe this is better (to not repeat your self):

log.transports.file.stream = fs.createWriteStream(log.transports.file.file, log.transports.file.streamConfig);

[JessicaIpo]

Thanks a lot !