# eslint-plugin-svelte
**Repository Path**: mirrors_ai/eslint-plugin-svelte
## Basic Information
- **Project Name**: eslint-plugin-svelte
- **Description**: ESLint plugin for Svelte using AST
- **Primary Language**: Unknown
- **License**: MIT
- **Default Branch**: main
- **Homepage**: None
- **GVP Project**: No
## Statistics
- **Stars**: 0
- **Forks**: 0
- **Created**: 2025-11-15
- **Last Updated**: 2025-11-26
## Categories & Tags
**Categories**: Uncategorized
**Tags**: None
## README
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# eslint-plugin-svelte
## ESLint plugin for Svelte using AST
[Live Demo](https://eslint-online-playground.netlify.app/#eslint-plugin-svelte%20with%20typescript) •
[Documentation](https://sveltejs.github.io/eslint-plugin-svelte/) •
[Discord](https://svelte.dev/chat)
## Introduction
`eslint-plugin-svelte` is the official [ESLint](https://eslint.org/) plugin for [Svelte](https://svelte.dev/).\
It leverages the AST generated by [svelte-eslint-parser](https://github.com/sveltejs/svelte-eslint-parser) to provide custom linting for Svelte.\
Note that `eslint-plugin-svelte` and `svelte-eslint-parser` cannot be used alongside [eslint-plugin-svelte3](https://github.com/sveltejs/eslint-plugin-svelte3).
## Installation
```bash
npm install --save-dev svelte eslint eslint-plugin-svelte globals
```
> [!NOTE]
>
> **Requirements:**
>
> - ESLint v8.57.1, v9.0.0, and above
> - Node.js v18.18.0, v20.9.0, v21.1.0 and above
## Usage
Use the `eslint.config.js` file to configure rules. For more details, see the [ESLint documentation](https://eslint.org/docs/latest/use/configure/configuration-files-new).
### Configuration
#### JavaScript project
```js
// eslint.config.js
import js from '@eslint/js';
import svelte from 'eslint-plugin-svelte';
import globals from 'globals';
import svelteConfig from './svelte.config.js';
/** @type {import('eslint').Linter.Config[]} */
export default [
js.configs.recommended,
...svelte.configs.recommended,
{
languageOptions: {
globals: {
...globals.browser,
...globals.node // Add this if you are using SvelteKit in non-SPA mode
}
}
},
{
files: ['**/*.svelte', '**/*.svelte.js'],
languageOptions: {
parserOptions: {
// We recommend importing and specifying svelte.config.js.
// By doing so, some rules in eslint-plugin-svelte will automatically read the configuration and adjust their behavior accordingly.
// While certain Svelte settings may be statically loaded from svelte.config.js even if you don’t specify it,
// explicitly specifying it ensures better compatibility and functionality.
//
// If non-serializable properties are included, running ESLint with the --cache flag will fail.
// In that case, please remove the non-serializable properties. (e.g. `svelteConfig: { ...svelteConfig, kit: { ...svelteConfig.kit, typescript: undefined }}`)
svelteConfig
}
}
},
{
rules: {
// Override or add rule settings here, such as:
// 'svelte/rule-name': 'error'
}
}
];
```
#### TypeScript project
```shell
npm install --save-dev typescript-eslint
```
```js
// eslint.config.js
import js from '@eslint/js';
import svelte from 'eslint-plugin-svelte';
import globals from 'globals';
import ts from 'typescript-eslint';
import svelteConfig from './svelte.config.js';
export default ts.config(
js.configs.recommended,
...ts.configs.recommended,
...svelte.configs.recommended,
{
languageOptions: {
globals: {
...globals.browser,
...globals.node
}
}
},
{
files: ['**/*.svelte', '**/*.svelte.ts', '**/*.svelte.js'],
// See more details at: https://typescript-eslint.io/packages/parser/
languageOptions: {
parserOptions: {
projectService: true,
extraFileExtensions: ['.svelte'], // Add support for additional file extensions, such as .svelte
parser: ts.parser,
// Specify a parser for each language, if needed:
// parser: {
// ts: ts.parser,
// js: espree, // Use espree for .js files (add: import espree from 'espree')
// typescript: ts.parser
// },
// We recommend importing and specifying svelte.config.js.
// By doing so, some rules in eslint-plugin-svelte will automatically read the configuration and adjust their behavior accordingly.
// While certain Svelte settings may be statically loaded from svelte.config.js even if you don’t specify it,
// explicitly specifying it ensures better compatibility and functionality.
//
// If non-serializable properties are included, running ESLint with the --cache flag will fail.
// In that case, please remove the non-serializable properties. (e.g. `svelteConfig: { ...svelteConfig, kit: { ...svelteConfig.kit, typescript: undefined }}`)
svelteConfig
}
}
},
{
rules: {
// Override or add rule settings here, such as:
// 'svelte/rule-name': 'error'
}
}
);
```
> [!WARNING]
> The TypeScript parser uses a singleton internally, meaning it only respects the options provided during its initial initialization.
> If you try to change the options for a different file or override them later, the parser will ignore the new options, which may lead to errors.
> For more context, see [typescript-eslint/typescript-eslint#6778](https://github.com/typescript-eslint/typescript-eslint/issues/6778).
### Available Configurations
This plugin provides the following configurations:
- **`eslintPluginSvelte.configs.base`** ... Enables correct Svelte parsing.
- **`eslintPluginSvelte.configs.recommended`** ... Includes `base` configuration, plus rules to prevent errors or unintended behavior.
- **`eslintPluginSvelte.configs.prettier`** ... Disables rules that may conflict with [Prettier](https://prettier.io/). You still need to configure Prettier to work with Svelte manually, for example, by using [prettier-plugin-svelte](https://github.com/sveltejs/prettier-plugin-svelte).
- **`eslintPluginSvelte.configs.all`** ... Includes all available rules. **Note:** This configuration is not recommended for production use, as it changes with every minor and major version of `eslint-plugin-svelte`. Use at your own risk.
For more details, see [the rule list](https://sveltejs.github.io/eslint-plugin-svelte/rules/) to explore the rules provided by this plugin.
### settings.svelte
You can customize the behavior of this plugin using specific settings.
```js
// eslint.config.js
export default [
// ...
{
settings: {
svelte: {
// Specifies an array of rules to ignore reports within the template.
// For example, use this to disable rules in the template that may produce unavoidable false positives.
ignoreWarnings: [
'@typescript-eslint/no-unsafe-assignment',
'@typescript-eslint/no-unsafe-member-access'
],
// Specifies options for Svelte compilation.
// This affects rules that rely on Svelte compilation,
// such as svelte/valid-compile and svelte/no-unused-svelte-ignore.
// Note that this setting does not impact ESLint’s custom parser.
compileOptions: {
// Specifies options related to PostCSS. You can disable the PostCSS processing by setting it to false.
postcss: {
// Specifies the path to the directory that contains the PostCSS configuration.
configFilePath: './path/to/my/postcss.config.js'
}
},
// Even if settings.svelte.kit is not specified, the rules will attempt to load information from svelte.config.js.
// However, if the default behavior does not work as expected, you should specify settings.svelte.kit explicitly.
// If you are using SvelteKit with a non-default configuration, you need to set the following options.
// The schema is a subset of SvelteKit’s configuration, so refer to the SvelteKit documentation for more details.
// https://svelte.dev/docs/kit/configuration
kit: {
files: {
routes: 'src/routes'
}
}
}
}
}
// ...
];
```
## Editor Integrations
**Visual Studio Code**\
Install [dbaeumer.vscode-eslint](https://marketplace.visualstudio.com/items?itemName=dbaeumer.vscode-eslint).\
Configure `.svelte` files in `.vscode/settings.json`:
```json
{
"eslint.validate": ["javascript", "javascriptreact", "svelte"]
}
```
## Migration Guide
If you’re migrating from `eslint-plugin-svelte` v1 or [`@ota-meshi/eslint-plugin-svelte`](https://www.npmjs.com/package/@ota-meshi/eslint-plugin-svelte), see the [migration guide](https://sveltejs.github.io/eslint-plugin-svelte/migration/).
## Versioning Policy
This project follows [Semantic Versioning](https://semver.org/). Unlike [ESLint’s versioning policy](https://github.com/eslint/eslint#semantic-versioning-policy), new rules may be added to the recommended config in minor releases. If these rules cause unwanted warnings, you can disable them.
## Rules
:wrench: Indicates that the rule is fixable, and using `--fix` option on the [command line](https://eslint.org/docs/user-guide/command-line-interface#fixing-problems) can automatically fix some of the reported problems.\
:bulb: Indicates that some problems reported by the rule are manually fixable by editor [suggestions](https://eslint.org/docs/developer-guide/working-with-rules#providing-suggestions).\
:star: Indicates that the rule is included in the `plugin:svelte/recommended` config.
## Possible Errors
These rules relate to possible syntax or logic errors in Svelte code:
| Rule ID | Description | |
|:--------|:------------|:---|
| [svelte/infinite-reactive-loop](https://sveltejs.github.io/eslint-plugin-svelte/rules/infinite-reactive-loop/) | Svelte runtime prevents calling the same reactive statement twice in a microtask. But between different microtask, it doesn't prevent. | :star: |
| [svelte/no-dom-manipulating](https://sveltejs.github.io/eslint-plugin-svelte/rules/no-dom-manipulating/) | disallow DOM manipulating | :star: |
| [svelte/no-dupe-else-if-blocks](https://sveltejs.github.io/eslint-plugin-svelte/rules/no-dupe-else-if-blocks/) | disallow duplicate conditions in `{#if}` / `{:else if}` chains | :star: |
| [svelte/no-dupe-on-directives](https://sveltejs.github.io/eslint-plugin-svelte/rules/no-dupe-on-directives/) | disallow duplicate `on:` directives | :star: |
| [svelte/no-dupe-style-properties](https://sveltejs.github.io/eslint-plugin-svelte/rules/no-dupe-style-properties/) | disallow duplicate style properties | :star: |
| [svelte/no-dupe-use-directives](https://sveltejs.github.io/eslint-plugin-svelte/rules/no-dupe-use-directives/) | disallow duplicate `use:` directives | :star: |
| [svelte/no-not-function-handler](https://sveltejs.github.io/eslint-plugin-svelte/rules/no-not-function-handler/) | disallow use of not function in event handler | :star: |
| [svelte/no-object-in-text-mustaches](https://sveltejs.github.io/eslint-plugin-svelte/rules/no-object-in-text-mustaches/) | disallow objects in text mustache interpolation | :star: |
| [svelte/no-raw-special-elements](https://sveltejs.github.io/eslint-plugin-svelte/rules/no-raw-special-elements/) | Checks for invalid raw HTML elements | :star::wrench: |
| [svelte/no-reactive-reassign](https://sveltejs.github.io/eslint-plugin-svelte/rules/no-reactive-reassign/) | disallow reassigning reactive values | :star: |
| [svelte/no-shorthand-style-property-overrides](https://sveltejs.github.io/eslint-plugin-svelte/rules/no-shorthand-style-property-overrides/) | disallow shorthand style properties that override related longhand properties | :star: |
| [svelte/no-store-async](https://sveltejs.github.io/eslint-plugin-svelte/rules/no-store-async/) | disallow using async/await inside svelte stores because it causes issues with the auto-unsubscribing features | :star: |
| [svelte/no-top-level-browser-globals](https://sveltejs.github.io/eslint-plugin-svelte/rules/no-top-level-browser-globals/) | disallow using top-level browser global variables | |
| [svelte/no-unknown-style-directive-property](https://sveltejs.github.io/eslint-plugin-svelte/rules/no-unknown-style-directive-property/) | disallow unknown `style:property` | :star: |
| [svelte/prefer-svelte-reactivity](https://sveltejs.github.io/eslint-plugin-svelte/rules/prefer-svelte-reactivity/) | disallow using mutable instances of built-in classes where a reactive alternative is provided by svelte/reactivity | :star: |
| [svelte/require-store-callbacks-use-set-param](https://sveltejs.github.io/eslint-plugin-svelte/rules/require-store-callbacks-use-set-param/) | store callbacks must use `set` param | :bulb: |
| [svelte/require-store-reactive-access](https://sveltejs.github.io/eslint-plugin-svelte/rules/require-store-reactive-access/) | disallow to use of the store itself as an operand. Need to use $ prefix or get function. | :star::wrench: |
| [svelte/valid-compile](https://sveltejs.github.io/eslint-plugin-svelte/rules/valid-compile/) | disallow warnings when compiling. | |
| [svelte/valid-style-parse](https://sveltejs.github.io/eslint-plugin-svelte/rules/valid-style-parse/) | require valid style element parsing | |
## Security Vulnerability
These rules relate to security vulnerabilities in Svelte code:
| Rule ID | Description | |
|:--------|:------------|:---|
| [svelte/no-at-html-tags](https://sveltejs.github.io/eslint-plugin-svelte/rules/no-at-html-tags/) | disallow use of `{@html}` to prevent XSS attack | :star: |
| [svelte/no-target-blank](https://sveltejs.github.io/eslint-plugin-svelte/rules/no-target-blank/) | disallow `target="_blank"` attribute without `rel="noopener noreferrer"` | |
## Best Practices
These rules relate to better ways of doing things to help you avoid problems:
| Rule ID | Description | |
|:--------|:------------|:---|
| [svelte/block-lang](https://sveltejs.github.io/eslint-plugin-svelte/rules/block-lang/) | disallows the use of languages other than those specified in the configuration for the lang attribute of `