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Clarify that arrow functions are not exposed over Workers RPC #28390

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Clarify that arrow functions are not exposed over Workers RPC #28390

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18 changes: 18 additions & 0 deletions src/content/docs/workers/runtime-apis/rpc/visibility.mdx
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Expand Up @@ -23,6 +23,24 @@ This security model is commonly known as Object Capabilities, or Capability-Base

[Private properties](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Classes/Private_properties) of classes are not directly exposed over RPC.

### Arrow functions

Arrow function expressions are not exposed over RPC because they are defined on class instances, not on the class prototype. They [should not be used as class methods](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/Arrow_functions#cannot_be_used_as_methods) of `WorkerEntrypoint` classes.

```js
import { WorkerEntrypoint } from "cloudflare:workers";

export default class extends WorkerEntrypoint {
// add() is exposed over RPC.
add(a: number, b: number) {
return a + b;
}

// subtract() is NOT exposed over RPC.
subtract = (a: number, b: number) => a - b;
}
```

### Class instance properties

When you send an instance of an application-defined class, the recipient can only access methods and properties declared on the class, not properties of the instance. For example:
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