types(router): added router array type for Array RouteConfig

[manuelojeda]

What kind of change does this PR introduce? (check at least one)

• Bugfix
• Feature
• Code style update
• Refactor
• Docs
• Underlying tools
• Other, please describe:

Does this PR introduce a breaking change? (check one)

• Yes
• No

Other information:
This PR adds the type annotation to the const routes in router/index.ts when vue-router and TypeScript are selected in the CLI.
❌If you use the @vue/composition-api with both, router and TS selected, and error will pop up in the console as a shown in this image: https://i.imgur.com/NXugrHy.png

✅ After you add the annotation as stated in this PR there is no error shown in the console:
https://i.imgur.com/rq0S34U.png

Note: ❌ If you add the annotation type like const routes:<Array<RouteConfig>> an error will occur and won't accept the error: https://i.imgur.com/5gytWju.png

[haoqunjiang]

Sorry but I can't reproduce the error locally.
Do you have an reproduction repo? Did you use @vue/composition-api? If so, it should be a bug in that repo.

[manuelojeda]

Of course, here is a basic repo builded with the CLI with TypeScript and Vue Router, and only added the @vue/composition-api.
I found out that the erorr occurs when you use the Composition API in a view, in this example just added the API at views/Home.vue

Here is the repo:
https://github.com/manuelojeda/vue-ts-router-composition-api

[masonk]

vuejs/composition-api#185 is probably a dupe of this

[haoqunjiang]

Now that @vue/composition-api v0.4 has fixed this bug, we can go with the const routes: Array<RouteConfig> syntax.

[haoqunjiang]

Thanks!