SvelteKit: How to refer to the /routes folder from components and endpoints via alias, like $routes?

Question

The next is my (simplified) project structure:

appname
|
|__src
|  |__lib
|  |__routes
|
|__jsconfig.json

In the jsconfig.js file, I have paths key with an alias to a './src/lib' folder in form of $lib.

{
    "compilerOptions": {
        "baseUrl": ".",
        "paths": {
            "$lib": ["src/lib"],
            "$lib/*": ["src/lib/*"],
        }
    },
    "include": ["src/**/*.d.ts", "src/**/*.js", "src/**/*.svelte"]
}

I want to access routes folder with $routes alias in the same way as $lib. But if I add "$routes": ["src/routes"] in above JSON file, sveltekit cannot resolve the path starting with '$routes/somefile'

Example:

{
    "compilerOptions": {
        "baseUrl": ".",
        "paths": {
            "$lib": ["src/lib"],
            "$lib/*": ["src/lib/*"],
            "$routes": ["src/routes"],
            "$routes/*": ["src/routes/*"],
        }
    },
    "include": ["src/**/*.d.ts", "src/**/*.js", "src/**/*.svelte"]
}

endpoint.js

import { db } from '$routes/db';

What am I doing wrong?

Answer 1

You also have to tell the bundler to use it in svelte.config.js

kit: {
  vite: {
    resolve: {
      alias: {
        $routes: path.resolve('./src/routes')
      }
    }
  } 
}

That said, remember that all files in the routes folder except for the ones starting with an _ underscore) are considered to be routes. So if you have file /src/routes/db.js a user can go to http://yoursite.domain/db.

There is very rarely any reason to import a file from there and if you need to do so, it likely is not a route or endpoint and can be safely put in lib instead

Answer 2

To complement on Stephane Vanraes answer.

I'm using SvelteKit with TypeScript so I add the path to tsconfig.json as follows:

{
  "extends": "./.svelte-kit/tsconfig.json",
  "compilerOptions": {
    "baseUrl": ".",
    "paths": {
      "$routes": ["src/routes"],
      "$routes/*": ["src/routes/*"]
    }
  }
}

Then I setup svelte.config.js as follows:

import path from 'path';

/** @type {import('@sveltejs/kit').Config} */
const config = {
  kit: {
    vite:{
      resolve: {
        alias: {
          $routes: path.resolve('./src/routes'),
        }
      }
    },
  },
};

If you are also using Vitest, you can setup export the object provided under config.kit.vite and import it in your vite.config.ts file as follows:

/// <reference types="vitest" />
import { defineConfig } from 'vite';
import { svelte } from '@sveltejs/vite-plugin-svelte';

import { viteConfig } from './svelte.config.js';

import type { UserConfig } from 'vite';

export default defineConfig({
  ...(viteConfig as UserConfig),
  plugins: [svelte()],
});

This way you can import routes for testing from your Vitest suites.