How do I declare the type of a value in a map in TypeScript?

Question

I'm having trouble declaring the value of a value in a key-value pair of a map in TypeScript.

map: {
  key: someStruct
}

I would like to declare the type of someStruct while initializing it at the same time. How do I do this?

Possible duplicate of [ES6 Map in Typescript](https://stackoverflow.com/questions/30019542/es6-map-in-typescript) — msanford, Jul 12 '19 at 01:50

score 0 · Answer 1 · answered Jul 12 '19 at 01:29

0

You can use it like this, and assign it if you want also to some variable x

let x = new Map([
        ["key", ["val1"]],
        ["key2", ["val2"]]
    ]);

answered Jul 12 '19 at 01:29

Mohamed Sweelam

score 0 · Answer 2 · answered Jul 12 '19 at 06:10

I don't know the whole object, but here's how you can do it.

This is your Interfaces

interface Struct {
   ...
}

interface Map {
   key: Struct
}

const map: Map {
   key: someStruct
}

or if you don't have access to the whole object

map: <Map>({
   key: someStruct
})

// or

map: {
   key: someStruct
} as Map

2 Answers2