Slow performance

[rogerfar]

I have this eslint config:

import { includeIgnoreFile } from '@eslint/compat';
import js from '@eslint/js';
import prettier from 'eslint-config-prettier';
import svelte from 'eslint-plugin-svelte';
import globals from 'globals';
import { fileURLToPath } from 'node:url';
import ts from 'typescript-eslint';

import svelteConfig from './svelte.config.js';
import svelteImportMatchFilename from './tools/svelte-import-match-filename.js';

const gitignorePath = fileURLToPath(new URL('./.gitignore', import.meta.url));

export default ts.config(
	{
		ignores: ['**/static']
	},
	includeIgnoreFile(gitignorePath),
	js.configs.recommended,
	...ts.configs.recommended,
	...svelte.configs.recommended,
	prettier,
	...svelte.configs['flat/prettier'],
	{
		languageOptions: {
			globals: {
				...globals.browser,
				...globals.node,
				NodeJS: true
			}
		},
		plugins: {
			'svelte-imports': {
				rules: {
					'import-match-filename': svelteImportMatchFilename
				}
			}
		},
		rules: {
			'@typescript-eslint/no-var-requires': 'error',
			'svelte/no-at-html-tags': ['off'],
			'svelte-imports/import-match-filename': 'error',
			'no-useless-escape': 'off'
		}
	},
	{
		files: ['**/*.svelte', '**/*.svelte.ts', '**/*.svelte.js'],
		ignores: ['eslint.config.js', 'svelte.config.js'],

		languageOptions: {
			parserOptions: {
				projectService: true,
				extraFileExtensions: ['.svelte'],
				parser: ts.parser,
				svelteConfig
			}
		}
	}
);

But linting my project takes about 5 minutes, the debug output shows this for basically each svelte file:

eslint:eslint Lint C:\Projects\client\src\stories\Button.stories.svelte +4ms
  eslint:linter Linting code for C:\Projects\client\src\stories\Button.stories.svelte (pass 1) +0ms
  eslint:linter Verify +0ms
  eslint:linter With flat config: C:\Projects\client\src\stories\Button.stories.svelte +0ms
  eslint:linter Apply the processor: [Module: null prototype] { meta: [Module: null prototype] { name: 'eslint-plugin-svelte', version: '3.6.0' }, postprocess: [Function: postprocess], preprocess: [Function: preprocess], supportsAutofix: true } +0ms
  eslint:linter A code block was found: '(unnamed)' +1ms
  eslint:languages:js Parsing: C:\Projects\client\src\stories\Button.stories.svelte +4ms
  eslint:languages:js Parsing successful: C:\Projects\client\src\stories\Button.stories.svelte +288ms
  eslint:languages:js Scope analysis: C:\Projects\client\src\stories\Button.stories.svelte +0ms
  eslint:languages:js Scope analysis successful: C:\Projects\client\src\stories\Button.stories.svelte +1ms
  eslint:linter Generating fixed text for C:\Projects\client\src\stories\Button.stories.svelte (pass 1) +297ms
  eslint:source-code-fixer Applying fixes +298ms
  eslint:source-code-fixer shouldFix parameter was false, not attempting fixes +1ms

That's almost 900ms for just a single file!

Is there perhaps something wrong in my config?

[gyurielf]

For me the following solve that:

languageOptions: {
	parserOptions: {
		projectService: true, // <------ TRY TO REMOVE THIS
		extraFileExtensions: ['.svelte'],
		parser: ts.parser,
		svelteConfig
	}
}