Type inferred as any in .svelte file.

[Stadly]

Before You File a Bug Report Please Confirm You Have Done The Following...

• I have tried restarting my IDE and the issue persists.
• I have updated to the latest version of the packages.

What version of ESLint are you using?

8.57.0

What version of eslint-plugin-svelte are you using?

2.35.1

What did you do?

Configuration

module.exports = {
  extends: ['plugin:@typescript-eslint/recommended-type-checked'],
  overrides: [
    {
      files: ['*.svelte'],
      parser: 'svelte-eslint-parser',
      parserOptions: {
        parser: '@typescript-eslint/parser',
        project: true,
        tsconfigRootDir: __dirname,
      },
    },
  ],
  parser: '@typescript-eslint/parser',
  parserOptions: {
    sourceType: 'module',
    extraFileExtensions: ['.svelte'],
    project: ['tsconfig.json', 'tsconfig.node.json'],
    tsconfigRootDir: __dirname,
  },
};

<script lang="ts">
  export let transition:
    | {
        duration?: number;
      }
    | undefined = undefined;
  if (transition) {
    // transition.duration should not be inferred as any but number
    transition.duration = transition.duration ?? 1500;
  }
</script>

What did you expect to happen?

transition.duration should be inferred as number.

If you look at transition.ts in the reproduction, you'll see it works correctly for .ts files, so it seems to be an issue with .svelte files.

What actually happened?

transition.duration is inferred as any.

Link to GitHub Repo with Minimal Reproducible Example

https://github.com/Stadly/reproduction/tree/eslint-plugin-svelte/type-inferred-as-any

Additional comments

No response

[ota-meshi]

Duplicate of #298