TypeScript Version: 3.4.0-dev.201xxxxx

Search Terms:
"typeof string is not assignable to"
"promise"

Code

interface ITest {
  name: 'test'
}

const createTestAsync = (): Promise<ITest> => Promise.resolve().then(() => ({ name: 'test' }))
// The same works if you write:
//    const createTestAsync = (): Promise<ITest> => Promise.resolve({ name: 'test' })

const createTest = (): ITest => {
  return { name: 'test' }
}

Expected behavior:
Expect both sync and async functions (createTest and createTestAsync) to compile without errors

Actual behavior:
createTestAsync throws the following compilation error:

Type 'Promise<{ name: string; }>' is not assignable to type 'Promise<ITest>'.
  Type '{ name: string; }' is not assignable to type 'ITest'.
    Types of property 'name' are incompatible.
      Type 'string' is not assignable to type '"test"'.

Playground Link:
https://www.typescriptlang.org/play/#src=interface%20ITest%20%7B%0D%0A%20%20name%3A%20'test'%0D%0A%7D%0D%0A%0D%0Aconst%20createTestAsync%20%3D%20()%3A%20Promise%3CITest%3E%20%3D%3E%0D%0A%20%20Promise.resolve().then(()%20%3D%3E%20(%7B%20name%3A%20'test'%20%7D))%0D%0A%0D%0Aconst%20createTest%20%3D%20()%3A%20ITest%20%3D%3E%20%7B%0D%0A%20%20return%20%7B%20name%3A%20'test'%20%7D%0D%0A%7D%0D%0A

Related Issues:
#29078

Further notes
Hi there, first time I'm interacting with the Typescript github repo. I wasn't able to find any issues which described the exact same problem but I wasn't sure exactly what search terms to use so apologies if there are duplicates. Furthermore, I am wondering whether there is something inherent in how Promises work which makes this problem occur - if so, I would love to be educated on the matter! :)
If there is any other information I can provide, please let me know.