What is the process of generating typed template literals using enums in TypeScript?

Is there a way to inform TypeScript that param is not just a string but of type RoleWithTier (without using an explicit as cast)?

enum Role {
    USER = 'user',
    ADMIN = 'admin'
}

enum Tier {
    ENTRY = 1,
    MAXIMUM = 10
} 

type RoleWithTier = `${Role}.${Tier}`


const param = `${Role.USER}.${Tier.ENTRY}`

const selectAction = (rwt: RoleWithTier) {
    // do stuff
}

selectAction(param) // Argument of type 'string' is not assignable to parameter of type '"user.1" | "user.10" | "admin.1" | "admin.10"'.(2345)

Link to TS playground

typescript

Answer №1

When you define the variable param, it automatically gets assigned the type string, and this type will not change in subsequent calls. You can either directly pass the template string:

selectOption(`${Type.GUEST}.${Category.BASIC}`); // works fine

Alternatively, you can use a const assertion:

const param = `${Type.GUEST}.${Category.BASIC}` as const;

Answer №2

Simply input the param variable as usual:

const param: RoleWithTier = `${Role.USER}.${Tier.ENTRY}`;

Additionally, make sure to include the . in the param value.

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