63 lines
2.3 KiB
Markdown
63 lines
2.3 KiB
Markdown
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## Class: ServiceWorkers
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> Query and receive events from a sessions active service workers.
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Process: [Main](../glossary.md#main-process)
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Instances of the `ServiceWorkers` class are accessed by using `serviceWorkers` property of
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a `Session`.
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For example:
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```javascript
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const { session } = require('electron')
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// Get all service workers.
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console.log(session.defaultSession.serviceWorkers.getAllRunning())
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// Handle logs and get service worker info
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session.defaultSession.serviceWorkers.on('console-message', (event, messageDetails) => {
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console.log(
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'Got service worker message',
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messageDetails,
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'from',
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session.defaultSession.serviceWorkers.getFromVersionID(messageDetails.versionId)
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)
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})
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```
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### Instance Events
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The following events are available on instances of `ServiceWorkers`:
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#### Event: 'console-message'
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Returns:
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* `event` Event
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* `messageDetails` Object - Information about the console message
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* `message` String - The actual console message
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* `versionId` Number - The version ID of the service worker that sent the log message
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* `source` String - The type of source for this message. Can be `javascript`, `xml`, `network`, `console-api`, `storage`, `app-cache`, `rendering`, `security`, `deprecation`, `worker`, `violation`, `intervention`, `recommendation` or `other`.
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* `level` Number - The log level, from 0 to 3. In order it matches `verbose`, `info`, `warning` and `error`.
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* `sourceUrl` String - The URL the message came from
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* `lineNumber` Number - The line number of the source that triggered this console message
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Emitted when a service worker logs something to the console.
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### Instance Methods
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The following methods are available on instances of `ServiceWorkers`:
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#### `serviceWorkers.getAllRunning()`
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Returns `Record<Number, ServiceWorkerInfo>` - A [ServiceWorkerInfo](structures/service-worker-info.md) object where the keys are the service worker version ID and the values are the information about that service worker.
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#### `serviceWorkers.getFromVersionID(versionId)`
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* `versionId` Number
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Returns [`ServiceWorkerInfo`](structures/service-worker-info.md) - Information about this service worker
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If the service worker does not exist or is not running this method will throw an exception.
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