Astro encounters issues when using svelte-testing-library

I am in the process of developing a website with Astro and integrating it with Svelte. To test my project, I have included svelte-testing-library, which works perfectly when executed using npm test.

However, after adding the component tests, running astro check fails for all calls to render() showing the following error:

No overload matches this call.
  Overload 1 of 2, '(component: Constructor<SvelteComponent<any, any, any>>, componentOptions?: any, renderOptions?: Omit<RenderOptions<typeof import("/workspaces/workspace/node_modules/@testing-library/dom/types/queries")>, "queries"> | undefined): RenderResult<...>', gave the following error.
  Overload 2 of 2, '(component: Constructor<SvelteComponent<any, any, any>>, componentOptions?: any, renderOptions?: RenderOptions<Queries> | undefined): RenderResult<...>', gave the following error.

11   render(Greeter, { name: "Luke Skywalker" });
               ~~~~~~~~~~~

I have created a Code Sandbox example showcasing the issue ler=a )n oorvy=dren(nrrof (%sepppiide.i eOTApo&ri/< T=>POAM>i Ta/R)t/>ob">'hilarsekrfoo';yiedytaMAR Scomponents/greeter.svelte and the corresponding test in components/greeter.test.ts.

Since npm test completes without errors, I expected astro check to do the same. Any suggestions on resolving this issue?

typescriptsvelteastrojssvelte-testing-library

Answer №1

After troubleshooting, I was able to fix the TypeScript errors that were coming up with astro check:

1. Create a new .d.ts file with the same name as your component

For instance, in the Code Sandbox example mentioned earlier, the file should be named greeter.d.ts

2. Include the appropriate typings following this guide: TypeScript: SvelteComponent

Your code snippet should resemble something like this:

import { SvelteComponent } from "svelte";

export default class Greeter extends SvelteComponent<{ name: string; }> {}
3. When importing the Svelte component for testing purposes, omit the .svelte file extension

Replace 

import Greeter from "./greeter.svelte"
with 
import Greeter from "./greeter"

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