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Without the API-* dependencies pinned different versions may be installed on local machines vs CI. One of the checks we do is to check that the checked in docs matches what is generated on CI. Therefore we need to ensure devs locally run the exact version that CI runs such that they generate the same output. So in this case we pin to a particular version of the dependencies.
3.2 KiB
3.2 KiB
WebWorker class
The WebWorker class represents a WebWorker.
Signature:
export declare class WebWorker extends EventEmitter
Extends: EventEmitter
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 | CDPSession | ||
| _executionContextCallback | (value: ExecutionContext) => void | ||
| _executionContextPromise | Promise<ExecutionContext> | ||
| _url | string |
Methods
| Method | Modifiers | Description |
|---|---|---|
| evaluate(pageFunction, args) | If the function passed to the worker.evaluate returns a Promise, then worker.evaluate would wait for the promise to resolve and return its value. If the function passed to the worker.evaluate returns a non-serializable value, then worker.evaluate resolves to undefined. DevTools Protocol also supports transferring some additional values that are not serializable by JSON: -0, NaN, Infinity, -Infinity, and bigint literals. Shortcut for await worker.executionContext()).evaluate(pageFunction, ...args). |
|
| evaluateHandle(pageFunction, args) | The only difference between worker.evaluate and worker.evaluateHandle is that worker.evaluateHandle returns in-page object (JSHandle). If the function passed to the worker.evaluateHandle returns a [Promise], then worker.evaluateHandle would wait for the promise to resolve and return its value. Shortcut for await worker.executionContext()).evaluateHandle(pageFunction, ...args) |
|
| executionContext() | Returns the ExecutionContext the WebWorker runs in | |
| url() |