CODEWITHSUNDEEP
typescript
edu
edu

Reputation: 443

Create String Literal Types dynamically

I have defined the following type:

type UserConfigCategories = 'tables-config' | 'link-config' | 'general-config';

however this type can grow and I do not want to have to update it. Is it possible to create this type dynamically from an array, for example?

Upvotes: 0

Views: 2617

Answers (1)

SpencerPark
SpencerPark

Reputation: 3506

If the array defining the categories is a literal somewhere in your source you can infer the type from the values with as const added in 3.4.

const CONFIG_CATEGORIES = ['tables-config', 'link-config', 'general-config'] as const;
type UserConfigCategories = (typeof CONFIG_CATEGORIES)[number]

const u: UserConfigCategories = 'tables-config';
const v: UserConfigCategories = 'bad-name'; // Type '"bad-name"' is not assignable to type 
                                            // '"tables-config" | "link-config" | "general-config"'.

Upvotes: 4

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