electron/docs/api/power-monitor.md

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# power-monitor
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The `power-monitor` module is used to monitor the power state change. You can
only use it on the main process. You should not use this module until the `ready`
event of `app` module gets emitted.
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An example is:
```javascript
var app = require('app');
var powerMonitor = require('power-monitor');
app.on('ready', function() {
powerMonitor.on('suspend', function() {
console.log('The system is going to sleep');
});
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});
```
## Event: suspend
Emitted when the system is suspending.
## Event: resume
Emitted when system is resuming.
## Event: on-ac
Emitted when the system changes to AC power.
## Event: on-battery
Emitted when system changes to battery power.