Typescript Type of multiple enums

Question

I have multiple enums in my app

enum HondaModels {
   Accord = 'Accord',
   ...
}
enum ToytaModels {
   Camry = 'Camry',
   ...
}

In my code I check if a car model passed to me is a Honda or Toyota.

I would like to declare a type that is either HondaModels or ToyotaModels

If i try this, I get an error

 type modelTypes: HondaModels || ToyotaModels

is there a better approach to having a custom type that is one of multiple enums?

Retardio · Accepted Answer · 2020-05-24 22:48:17Z

4

I would also avoid String enums. Using discriminated unions is much better because enums are strongly typed.

const HondaModels = {
  Accord: "Accord",
} as const;
type HondaModels = typeof HondaModels[keyof typeof HondaModels];

const ToyotaModels = {
  Camry: "Camry",
} as const;
type ToyotaModels = typeof ToyotaModels[keyof typeof ToyotaModels];

type modelTypes = HondaModels | ToyotaModels;

answered May 24, 2020 at 22:48

Retardio

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Comments

max · Accepted Answer · 2020-05-24 19:53:39Z

3

You have a syntax error

enum HondaModels {
   Accord = 'Accord',
}
enum ToytaModels {
   Camry = 'Camry',
}

type modelTypes =  typeof HondaModels | typeof ToytaModels

// Then use it like this
let abc: modelTypes = HondaModels

thanks to Aluan Haddad for the improved solution

edited May 24, 2020 at 19:53

answered May 24, 2020 at 19:14

max

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2 Comments

Ray Saudlach Over a year ago

Thank you for your response; I'm actually looking to store abc as all HondaModels or ToyotaModels, of NissanModels, etc. ``` let abc = HondaModels ``` this returns an error

Aluan Haddad Over a year ago

@RaySaudlach, for that latter, you need the union to be a union of the types of the enumerations, not their members: type modelTypes = typeof HondaModels | typeof ToytaModels

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