Describe the bug
the typesVersions field in package.json for the following packages point to the source code in /src instead of the type declaration files in /dist:

• @smui/common
• @smui/snackbar
• @smui/select
• @smui/textfield

this causes several problems:

• causes compile errors in usages of these packages if the tsconfig files are different:

  • TypeScript Error "Not all code paths return a value." #514
  • @smui/common - "Type 'CustomEvent<T | undefined>' is not assignable to type 'CustomEvent<T>'" error when strictNullChecks is enabled in tsconfig #530
  • @smui/common - typescript errors when noUncheckedIndexedAccess compiler option is enabled #531

  while errors can still occur in .d.ts files due to differing tsconfigs, it's far less common when exporting *.d.ts files as function implementations don't need to be typechecked. in this case, switching all of the typesVersions to the .d.ts files in /dist fixes all of the above errors

• prevents the skipLibCheck compiler option from working. this means there's no way to work around the above errors other than disabling the strictness flags that are causing them

• probably slows down svelte-check as it's needlessly checking implementation code that the user did not write.

To Reproduce
see the issues linked above

Expected behavior
example typesVersions for @smui/common:

{
  "typesVersions": {
    "*": {
      "classadder": [
        "./dist/classadder/index.d.ts"
      ],
      "internal": [
        "./dist/internal/index.d.ts"
      ],
      "*": [
        "./dist/*"
      ]
    }
  }
}