[API reference](https://evolu.dev/docs/api-reference) › [@evolu/web](https://evolu.dev/docs/api-reference/web) › createOneTabSharedWorkerSelfPolyfill

```ts
function createOneTabSharedWorkerSelfPolyfill<Input, Output>(
  nativeSelf: DedicatedWorkerGlobalScope,
): SharedWorkerSelf<Input, Output>;
```

Defined in: [Worker.ts:195](https://github.com/evoluhq/evolu/blob/b6ade4b22d4be1758761a2712668e870d3e602c7/packages/web/src/Worker.ts#L195)

Creates a one-tab [SharedWorkerSelf](https://evolu.dev/docs/api-reference/common/Worker/interfaces/SharedWorkerSelf) polyfill for browsers without
native SharedWorker support.

Delivers one synthetic `onConnect` port, queues startup messages until
`onMessage` is set, and does not share state across tabs.