ESLint plugin Svelte Preprocessor

Purpose

It's a preprocessor to use with eslint-plugin-svelte3 to produce AST valid to the original code.

For now only TypeScript is supported but the idea is to add Coffeescript and Pug support, like the svelte-preprocess package.

Many thanks to Conduitry and her/his initial work on her/his fork.

Install

pnpm i -D eslint-svelte3-preprocess

Usage

x After following the docs of eslint-plugin-svelte3 to configure your eslintrc.js file, you will need to add some props required by @typescript-eslint/parser and finally import your svelte.config file (if you would like to use the same configuration) and call the elint-plugin-svelte3-preprocess passing your preprocess as a parameter.

This is a example that works!

const eslintSveltePreprocess = require("eslint-svelte3-preprocess");
const svelteConfig = require("./svelte.config");

module.exports = {
    parserOptions: {
        ecmaVersion: 2019,
        sourceType: "module",
    },
    parser: "@typescript-eslint/parser",
    env: {
        es6: true,
        browser: true,
    },
    extends: ["eslint:recommended", "plugin:@typescript-eslint/recommended"],
    plugins: ["svelte3", "@typescript-eslint"],
    overrides: [
        {
            files: ["*.svelte"],
            processor: "svelte3/svelte3",
        },
    ],
    settings: {
        "svelte3/preprocess": eslintSveltePreprocess(svelteConfig.preprocess),
    },
};

Editor support

I only tested it on Visual Studio Code, but I guess it should be similar for other editors. If you find the way to solve it, I would appreciate your collaboration to improve this documentation.

Visual Studio Code

Having Svelte for VS Code and ESLint extensions, you need to add this to your configuration.

{
    "eslint.validate": ["svelte"]
}