48 lines
1.1 KiB
Markdown
48 lines
1.1 KiB
Markdown
# powerMonitor
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> Monitor power state changes.
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Process: [Main](../glossary.md#main-process)
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You cannot require or use this module until the `ready` event of the `app`
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module is emitted.
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For example:
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```javascript
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const electron = require('electron')
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const {app} = electron
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app.on('ready', () => {
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electron.powerMonitor.on('suspend', () => {
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console.log('The system is going to sleep')
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})
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})
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```
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## Events
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The `powerMonitor` module emits the following events:
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### Event: 'suspend'
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Emitted when the system is suspending.
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### Event: 'resume'
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Emitted when system is resuming.
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### Event: 'on-ac' _Windows_
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Emitted when the system changes to AC power.
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### Event: 'on-battery' _Windows_
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Emitted when system changes to battery power.
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### Event: 'shutdown' _Linux_
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Emitted when the system is about to reboot or shut down. If the event handler
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invokes `e.preventDefault()`, Electron will attempt to delay system shutdown in
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order for the app to exit cleanly. If `e.preventDefault()` is called, the app
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should exit as soon as possible by calling something like `app.quit()`.
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