lint typescript in svelte components

[sarahscott]

Currently, eslint-plugin-svelte3 doesn't support typescript because it would require preprocessing, and there is currently no support for preprocessors of any kind. There is a cli tool to check for typescript errors (svelte-check), but no straightforward linting solution for typescript-enabled svelte components.

We might consider something like this approach, but with a more recent version of svelte-preprocess; in any case, getting eslint-plugin-svelte3 working with a preprocessor and specifically with typescript will be a nontrivial chore.

Relevant issues to track:

• Typescript? sveltejs/eslint-plugin-svelte3#68
• Preprocessor support? sveltejs/eslint-plugin-svelte3#10

Inspo from other frameworks, should we take this on:

• eslint + typescript + react
• angular-eslint with typescript support
• eslint-plugin-vue with typescript support

[NicoCevallos]

@sarahscott take a look at this repo where I did more or less the same as you mention in the other repo I made but using patch-package to avoid weird tricky fix lol... in that case you only would need to copy the patch related to eslint-plugin-svelte3, install patch-package and add the postinstall script to apply the patch after install the eslint-plugin-svelte3