camc314 72cb5e3539 fix(parser): reject rest parameters in getters (#26400) ...

## Summary

Getter accessors must have no formal parameters, but Oxc currently accepts a getter whose only parameter is a rest parameter. This affects class and object getters, as well as getter signatures in TypeScript interfaces and type literals.

```ts
class C { get x(...args) {} }
({ get x(...args) {} });
interface I { get x(...args: any[]): string }
type T = { get x(...args: any[]): string };
```

Each declaration above previously parsed without a diagnostic. It now reports the existing error: `A 'get' accessor must not have any formal parameters.`

## Cause and correction

`FormalParameters` stores ordinary parameters in `items` and the rest parameter separately in `rest`. Both getter checks inspected only whether `items` was empty, so a rest-only parameter list looked like a zero-parameter list.

Use `parameters_count() != 0` in both checks so the count includes the rest parameter. The shared `check_getter` path covers class and object getters; `parse_getter_setter_signature_member` covers interface and type-literal getter signatures.

The diagnostic still points at the full parameter list. Zero-parameter getters remain valid, ordinary getter parameters retain their existing diagnostic, and class/object accessors with type parameters retain the current type-parameter diagnostic precedence. Setter validation is unchanged.

2026-09-07 15:34:10 +00:00

145 B

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