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Document how to load worker multiple times #3009

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merged 2 commits into from May 2, 2022
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Document how to load worker multiple times #3009

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Document how to load worker multiple times
codetheweb Apr 11, 2022
81e8373
Update shared-workers.md
codetheweb Apr 20, 2022
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19 changes: 19 additions & 0 deletions docs/recipes/shared-workers.md
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Expand Up @@ -34,6 +34,25 @@ const shared = registerSharedWorker({

Within a test process you can only register one worker for each `filename`. Filenames are compared as-is, without normalization. If you call `registerSharedWorker()` a second time, the same worker instance is returned.

If for some reason you want to load the same file as multiple different workers, you can append a unique hash to the end of the filename:
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```js
import crypto from 'crypto';
import {registerSharedWorker} from 'ava/plugin';

const randomKey = crypto.randomBytes(20).toString('hex');
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const shared = registerSharedWorker<any>({
filename: new URL(
`file:${path.resolve(
__dirname,
'worker.js'
)}#${encodeURIComponent(randomKey)}`
),
supportedProtocols: ['ava-4']
});
```

You can supply a `teardown()` function which will be called after all tests have finished. If you call `registerSharedWorker()` multiple times then the `teardown()` function will be invoked for each registration, even though you only got one worker instance. The most recently registered `teardown()` function is called first, and so forth. `teardown()` functions execute sequentially.

```js
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