How to declare a Global Variable in typescript [duplicate]

Question

I have inherited a Typescript project (has .ts) but I? can't seem to workout how to create a Global variable in a Typescript file and access it another.

I am new to Typescript so please bear with me.

I am not using Angular - saw this link Typescript - Declare optional global variable

Any pointers highly appreciated

Does this answer your question? Create a global variable in TypeScript — Kipras Melnikovas
– Kipras Melnikovas, Commented Nov 4, 2020 at 17:50

Alexandre · Accepted Answer · 2020-11-04 17:58:02Z

0

It depends on which runtime you are using typescript (eg: nodejs or browser)

NodeJS runtime

You have to export and import your variable.

// a.ts
export const foo = "bar";

// b.ts
import { foo } from 'a.ts';

Browser runtime

You can use the global object window

window.foo = "bar"

You can also use export and import but in this case you have to build your code with a builder (webpacker, rollup and so on)

Since typescript 3.4, you can also use globalThis on both runtimes: https://www.typescriptlang.org/docs/handbook/release-notes/typescript-3-4.html#type-checking-for-globalthis

answered Nov 4, 2020 at 17:58

Alexandre

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