Received a JSON value that cannot be converted into a tuple of two numbers in Typescript

I'm a beginner when it comes to TypeScript and I am struggling to find the solution to my question.

In my project, there is a config.json file structured like this:

{
  "api": {
    "baseUrl": "http://localhost:9000/api",
    "list": {
      "itemsPerPage": 200
    }
  },
  "map": {
    "start": {
      "position": [51.505, -0.09],
      "zoom": 2
    },
    "leaflet": {
      "minOpacity": 0.3,
      "accessToken": "something"
    }
  }
}

I have imported this config.json into a module.tsx file:

import config from '../config.json';
const mapCenter: [number, number] = config.map.start.position;

The 'position' property in the JSON needs to be treated as a '[number, number]' tuple due to requirements of a library I use. However, I am encountering an error:

TS2322: Type 'number[]' is not assignable to type '[number, number]'. Property '0' is missing in type 'number[]'.

I need assistance on how to correctly cast types in this scenario?

Is it possible to declare the type of my JSON using a 'config.d.ts' file? If so, how can I achieve that?

Thank you for your help.

javascriptjsontypescripttypescript-typings

Answer №1

Because Tuples in typescript are considered enhanced arrays, you have the ability to utilize the "as" keyword for casting it to your specific type:

const mapCenterCoordinates: [number, number] = mapSettings.map.center as [number, number];

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