Mastering TypeScript in Router Configuration

Question

Mastering TypeScript in Router Configuration

I am currently working with a standard router setup.

type Routes = '/' | '/achievements' | ... ;

This helps in identifying the routers present in the project. However, I am faced with a new challenge of creating an array that includes all the routers.

const allRoutes: Routes[] = ['/', '/achievements'];

If any router is missing from this array, it should trigger an error. The array must always encompass all available routers. Is there a way to achieve this?

I am stuck on how to enforce the array to contain every single router specified in the enumeration.

UPDATE

The types are defined in the d.ts file, which makes it impossible for me to use the construct

const ROUTES = ['/', '/achievements'] as const

and export it from there

javascript typescript

Answer 1

Answer №1

Here is a way you can achieve it:

const PAGES = ['/', '/projects'] as const

type PagesTuple = typeof PAGES

type Page = PagesTuple[number]

const allPages: PagesTuple = ['/', '/projects']

Answer 2

Here is a way you can achieve it:

const PAGES = ['/', '/projects'] as const

type PagesTuple = typeof PAGES

type Page = PagesTuple[number]

const allPages: PagesTuple = ['/', '/projects']

Answer 3

Answer №2

A suggested approach is to create a function that ensures every item in an array belongs to a specified union type.


type Colors = 'red' | 'blue' | 'green'

const selectedColors = ['red', 'blue', 'yellow']

function validateArray<T>() {
    return function <A extends readonly T[]>(arr: NoInfer<UpdatedArray<A, T>> | A & [never]) {
        return arr;
    }
}

let x = validateArray<Colors>()
//  ^?
let y = x(['red', 'blue', "green"])
//  ^? ['red']
let z = x(['red'])
//  ^? Argument of type '["red"]' is not assignable to parameter of type '["red", "blue" | "green"]'


type UpdatedArray<A extends readonly any[], V> = [V] extends [A[number]] ? A : [...A, Exclude<V, A[number]>]

type NoInfer<A> = [A][A extends any ? 0 : never]

Answer 4

A suggested approach is to create a function that ensures every item in an array belongs to a specified union type.


type Colors = 'red' | 'blue' | 'green'

const selectedColors = ['red', 'blue', 'yellow']

function validateArray<T>() {
    return function <A extends readonly T[]>(arr: NoInfer<UpdatedArray<A, T>> | A & [never]) {
        return arr;
    }
}

let x = validateArray<Colors>()
//  ^?
let y = x(['red', 'blue', "green"])
//  ^? ['red']
let z = x(['red'])
//  ^? Argument of type '["red"]' is not assignable to parameter of type '["red", "blue" | "green"]'


type UpdatedArray<A extends readonly any[], V> = [V] extends [A[number]] ? A : [...A, Exclude<V, A[number]>]

type NoInfer<A> = [A][A extends any ? 0 : never]

Mastering TypeScript in Router Configuration

Answer №1

Answer №2

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