electron/spec/fixtures/api/singleton-data/main.js

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const { app } = require('electron');
app.whenReady().then(() => {
console.log('started'); // ping parent
});
const obj = {
level: 1,
testkey: 'testvalue1',
inner: {
level: 2,
testkey: 'testvalue2'
}
};
const gotTheLock = app.requestSingleInstanceLock(obj);
app.on('second-instance', (event, args, workingDirectory, data) => {
setImmediate(() => {
console.log([JSON.stringify(args), JSON.stringify(data)].join('||'));
app.exit(0);
});
});
if (!gotTheLock) {
app.exit(1);
}