Nested snippets cause parsing error

[vojtechsimetka]

Before You File a Bug Report Please Confirm You Have Done The Following...

• I'm using eslint-plugin-svelte. (*.svelte file linting does not work with the parser alone. You should also use eslint-plugin-svelte with it.)
• I'm sure the problem is a parser problem. (If you are not sure, search for the issue in eslint-plugin-svelte repo and open the issue in eslint-plugin-svelte repo if there is no solution.
• I have tried restarting my IDE and the issue persists.
• I have updated to the latest version of the packages.

What version of ESLint are you using?

8.56.0

What version of eslint-plugin-svelte and svelte-eslint-parser are you using?

• [email protected]

What did you do?

Configuration

/** @type { import("eslint").Linter.Config } */
module.exports = {
	root: true,
	extends: [
		'eslint:recommended',
		'plugin:@typescript-eslint/recommended',
		'plugin:svelte/recommended',
		'prettier'
	],
	parser: '@typescript-eslint/parser',
	plugins: ['@typescript-eslint'],
	parserOptions: {
		sourceType: 'module',
		ecmaVersion: 2020,
		extraFileExtensions: ['.svelte']
	},
	env: {
		browser: true,
		es2017: true,
		node: true
	},
	overrides: [
		{
			files: ['*.svelte'],
			parser: 'svelte-eslint-parser',
			parserOptions: {
				parser: '@typescript-eslint/parser'
			}
		}
	]
};

src/lib/foo.svelte

<script>
	const { foo } = $props();
</script>

<div>
	{@render foo()}
</div>

src/page/+page.svelte

<script>
	import Foo from '$lib/foo.svelte';
</script>

{#snippet foo()}
	{#snippet bar()}Bar{/snippet}
	Foo {@render bar()}
{/snippet}

<Foo {foo} />

What did you expect to happen?

No error

What actually happened?

pnpm lint

> [email protected] lint nested-snippet-linter-error
> prettier --check . && eslint .

Checking formatting...
All matched files use Prettier code style!

nested-snippet-linter-error/src/routes/+page.svelte
0:0  error  Parsing error: Cannot read properties of undefined (reading 'length')

✖ 1 problem (1 error, 0 warnings)

 ELIFECYCLE  Command failed with exit code 1.

 
 However, issue in another project was even more cryptic but I can't recreate in minimal example

...src/routes/+page.svelte
0:0  error  Parsing error: fnDecl.params is not iterable

Link to GitHub Repo with Minimal Reproducible Example

https://github.com/vojtechsimetka/nested-snippet-linter-error

Additional comments

Same happens with eslint@9