Invalid reporting of `no-unused-expressions` for `_.{keys(mainnets).length}`

[PaulRBerg]

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Initial checklist

• [x] I read the support docs
• [x] I read the contributing guide
• [x] I agree to follow the code of conduct
• [x] I searched issues and discussions and couldn’t find anything (or linked relevant results below)

Affected package

eslint-plugin-mdx

Steps to reproduce

See the use of _.keys here:

---
id: chains
title: Supported Chains
sidebar_position: 7
---

import Link from "@docusaurus/Link";
import Chains from "@site/src/components/organisms/Chains";
import { Links } from "@site/src/constants";
import _ from "lodash";
import { mainnets, testnets } from "sablier";

Sablier Protocol is live on {_.keys(mainnets).length} mainnets and {_.keys(testnets).length} testnets, although not all of these chains are supported by the
[Sablier Interface](https://app.sablier.com/). If you're interested in having your chain listed in the Interface, fill out <Link href={Links.Forms.CALL}>this form</Link>.

Actual behavior

13:30  error  Expected an assignment or function call and instead saw an expression  no-unused-expressions

Expected behavior

There should be no error because that is perfectly legitimate MDX code. It compiles.

Runtime

No response

Package manager

bun

Operating system

[email protected]

Build and bundle tools

Docusaurus