we can define any number which is not in our enum.

[guoard]

Bug Report

we expect not to be able to define a role number which is not in our enum, but we can :|

enum Role {
    ADMIN,
    AUTHOR
}

interface User {
    role: Role
}

const user1: User = {
    role: 1234
}

🙁 Actual behavior

Compiles with out any Error.

🙂 Expected behavior

Type 'number' is not assignable to type 'Role'.

Different behavior with String

but this code gives us correct error message:

Type '"c"' is not assignable to type 'Role'.

enum Role {
    ADMIN = 'a',
    AUTHOR = 'b'
}

interface User {
    role: Role
}

const user1: User = {
    role: 'c'
}

[MartinJohns]

Duplicate of #26362, which provides plenty of reasoning for this behaviour. Used search terms: enum number in:title

What search terms did you use? You skipped that part of the issue template.