fix(config, vue-app): add module declaration for config and vue-app

[clarkdo]

Types of changes

• Bug fix (a non-breaking change which fixes an issue)
• New feature (a non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Fix error: File 'config/index.d.ts' is not a module.

Description

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly. (PR: #)
• I have added tests to cover my changes (if not applicable, please state why)
• All new and existing tests are passing.

[kevinmarrec]

@clarkdo Where have you been able to see such error ? 🤔

[clarkdo]

tsconfig.json with "noImplicitAny": true

I'm using @nuxt/config or vue-app in dev mode (import from source), not from node_modules