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Bound generic types don't warn until used #5409

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amsul opened this issue Nov 26, 2017 · 0 comments

amsul commented Nov 26, 2017

Hi there! Thanks for the awesome library.

I found a small inconvenience when using generic types. This snippet should warn, but doesn't:

type NameType = 'user'
type ObjectType<Name: NameType> = {
  name: Name,
}
type UserType = ObjectType<'lol'>

..until I try to use it:

const user: UserType = {
  name: 'user',
}

https://flow.org/try/#0C4TwDgpgBAcghgWwgFXNAvFA5AVwM4QBOWAUKJFAPIBGAVhAMbCqQA88SAXLIimgHxRMAbxJQoAO17cOEADQkAvmTRQAqgUIsMVOo2ZpWWADYB7Y1n4kSAegBUdqDZINTEvMCj4i3DUW1CUKLiUlzY3sQKyvZ2NkA

Not sure how to go about fixing it. But if there are any pointers, I would be glad to submit a PR 🙏

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