WebWorker class
This class represents a WebWorker.
Signature
export declare abstract class WebWorker extends EventEmitter<Record<EventType, unknown>>
Extends: EventEmitter<Record<EventType, unknown>>
Remarks
The events workercreated
and workerdestroyed
are emitted on the page object to signal the worker lifecycle.
The constructor for this class is marked as internal. Third-party code should not call the constructor directly or create subclasses that extend the WebWorker
class.
Example
page.on('workercreated', worker =>
console.log('Worker created: ' + worker.url())
);
page.on('workerdestroyed', worker =>
console.log('Worker destroyed: ' + worker.url())
);
console.log('Current workers:');
for (const worker of page.workers()) {
console.log(' ' + worker.url());
}
Properties
Property | Modifiers | Type | Description |
---|---|---|---|
client |
| The CDP session client the WebWorker belongs to. |
Methods
Method | Modifiers | Description |
---|---|---|
close() | ||
evaluate(func, args) | Evaluates a given function in the worker. Remarks: If the given function returns a promise, evaluate will wait for the promise to resolve. As a rule of thumb, if the return value of the given function is more complicated than a JSON object (e.g. most classes), then evaluate will _likely_ return some truncated value (or In general, you should use evaluateHandle if evaluate cannot serialize the return value properly or you need a mutable handle to the return object. | |
evaluateHandle(func, args) | Evaluates a given function in the worker. Remarks: If the given function returns a promise, evaluate will wait for the promise to resolve. In general, you should use evaluateHandle if evaluate cannot serialize the return value properly or you need a mutable handle to the return object. | |
url() | The URL of this web worker. |