How to use var, let or const at the Top Level In Typescript
Declare a variable with var, let or const at the top level of your script.
Example: In this example, we are using var, let, and const to create a global variable in TypeScript.
Javascript
var globalVar: string = "I am a global variable using var";let globalLet: string = "I am a global variable using let";const globalConst: number = 42;function useGlobalVarLetAndConst() { console.log(globalLet, globalConst, globalVar);}useGlobalVarLetAndConst(); // Accessible here |
Output:
I am a global variable using let
42
I am a global variable using var
How to Create a Global Variable in TypeScript ?
To create a global variable in TypeScript, we have multiple approaches. In this article, we are going to learn how to create a global variable in TypeScript.
Below are the approaches used to create a global variable in TypeScript:
Table of Content
- Using var, let or const at the Top Level
- Using window Object in Browser Environments
- Using a Namespace or Module
- Using declare Keyword