Crash in `unicorn/no-instanceof-builtins` and similar rules when linting .vue files

[polis89]

After upgrading from [email protected] to 57.0.0+ I'm experiencing ESLint crashes when linting .vue files with the following error:

Stack Trace

ESLint: 9.26.0

TypeError: Cannot read properties of null (reading 'childScopes')
Occurred while linting ./src/App.vue:14
Rule: "unicorn/explicit-length-check"
    at getInnermostScope (file://./.yarn/__virtual__/@eslint-community-eslint-utils-virtual-d459a613f3/3/.yarn/berry/cache/@eslint-community-eslint-utils-npm-4.7.0-47503bfa2a-10c0.zip/node_modules/@eslint-community/eslint-utils/index.mjs:19:40)
    at findVariable (file://./.yarn/__virtual__/@eslint-community-eslint-utils-virtual-d459a613f3/3/.yarn/berry/cache/@eslint-community-eslint-utils-npm-4.7.0-47503bfa2a-10c0.zip/node_modules/@eslint-community/eslint-utils/index.mjs:54:17)
    at file://./.yarn/__virtual__/eslint-plugin-unicorn-virtual-c66979b7c0/3/.yarn/berry/cache/eslint-plugin-unicorn-npm-59.0.1-5373ae1135-10c0.zip/node_modules/eslint-plugin-unicorn/rules/shared/simple-array-search-rule.js:90:5
    at EventEmitter.<anonymous> (file://./.yarn/__virtual__/eslint-plugin-unicorn-virtual-c66979b7c0/3/.yarn/berry/cache/eslint-plugin-unicorn-npm-59.0.1-5373ae1135-10c0.zip/node_modules/eslint-plugin-unicorn/rules/utils/rule.js:118:31)
    at EventEmitter.emit (node:events:530:35)
    at NodeEventGenerator.applySelector (./.yarn/__virtual__/vue-eslint-parser-virtual-7266f75b02/3/.yarn/berry/cache/vue-eslint-parser-npm-10.1.3-d7a30e8e7b-10c0.zip/node_modules/vue-eslint-parser/index.js:4373:26)
    at NodeEventGenerator.applySelectors (./.yarn/__virtual__/vue-eslint-parser-virtual-7266f75b02/3/.yarn/berry/cache/vue-eslint-parser-npm-10.1.3-d7a30e8e7b-10c0.zip/node_modules/vue-eslint-parser/index.js:4393:22)
    at NodeEventGenerator.enterNode (./.yarn/__virtual__/vue-eslint-parser-virtual-7266f75b02/3/.yarn/berry/cache/vue-eslint-parser-npm-10.1.3-d7a30e8e7b-10c0.zip/node_modules/vue-eslint-parser/index.js:4401:14)
    at traverse (./.yarn/__virtual__/vue-eslint-parser-virtual-7266f75b02/3/.yarn/berry/cache/vue-eslint-parser-npm-10.1.3-d7a30e8e7b-10c0.zip/node_modules/vue-eslint-parser/index.js:169:13)
    at traverse (./.yarn/__virtual__/vue-eslint-parser-virtual-7266f75b02/3/.yarn/berry/cache/vue-eslint-parser-npm-10.1.3-d7a30e8e7b-10c0.zip/node_modules/vue-eslint-parser/index.js:181:13)

At least the following rules are affected:

• unicorn/no-instanceof-builtins
• unicorn/number-literal-case
• unicorn/prefer-array-some
• unicorn/prefer-includes

Minimal package.json to reproduce:

{
  "name": "test_eslint",
  "packageManager": "[email protected]",
  "devDependencies": {
    "eslint": "^9.26.0",
    "eslint-plugin-unicorn": "^59.0.0",
    "eslint-plugin-vue": "^10.1.0",
    "vue-eslint-parser": "^10.1.3"
  }
}

and eslint.config.mjs

import unicorn from "eslint-plugin-unicorn";
import vue from "eslint-plugin-vue";

export default [
	unicorn.configs["flat/recommended"],
	...vue.configs["flat/recommended"],
	{
		files: ["**/*.vue"],
		rules: {
			// skipping the following rules fixes the issue
			// "unicorn/no-instanceof-builtins": "off",
			// "unicorn/number-literal-case": "off",
			// "unicorn/prefer-array-some": "off",
			// "unicorn/prefer-includes": "off"
		}
	}
];

I'm able to work around the issue by disabling the above rules for *.vue files, but I'd like to keep them enabled to ensure consistent linting behavior across all files, including Vue SFCs.

[fisker]

Looks like something wrong in @eslint-community/eslint-utils, can you share your App.vue file?

[polis89]

Looks like something wrong in @eslint-community/eslint-utils, can you share your App.vue file?

Sure.

<template>
	<div v-for="item in items" :key="item.key">
		<Item
			:activated="selected.some(s => item.key === s)"
		/>
	</div>
</template>

<script setup>
	import { ref } from "vue";
	import Item from "./item.vue";

	const items = ref([]);
	const selected = ref([]);
</script>

If I remove the :activated="selected.some(s => source.key === s)" line ESLint works, otherwise - it crushes

[fisker]

I'll take a look later. Thanks for the information.

[stephenjason89]

Experienced the same, here's a sample of my template for additonal information.

[fisker]

@polis89 Would you mind upgrade to lastest version and try to enable these rules to check if they work with Vue files?

[stephenjason89]

@fisker I can confirm that the latest version fixed the issue. Thank you so much