globalThis ponyfill
This is a trivial TypeScript-compatible [`globalThis`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/globalThis) [ponyfill](https://ponyfill.com/).
* very small minzipped size
* NO dependencies
* doesn't alter the environment ([ponyfill](https://ponyfill.com/))
* compatible with node & browser
## Usage
```js
import { getGlobalThis } from '@offirmo/globalthis-ponyfill'
// typed access
declare global {
var foo: number
}
const globalThis = getGlobalThis()
globalThis.foo = 42
// untyped access
const globalThis = getGlobalThis()
globalThis.bar = 42
```
## Rationale
* `globalThis` is a [TC-39 proposal](https://github.com/tc39/proposal-global)
which is [already supported by Firefox and Chrome](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/globalThis).
* There are existing ponyfills/polyfills [out there](https://github.com/ljharb/globalThis), but they didn't work for me:
* mine is much simpler: a single TS file of 6 meaningful lines
* I needed TypeScript
* a [ponyfill](https://ponyfill.com/) is better than a polyfill, it doesn't patch the environment.
## Credits
**YES** I had a look at [ljharb/globalThis](https://github.com/ljharb/globalThis) 's [implementation](https://github.com/ljharb/globalThis/blob/master/implementation.js) (MIT)
and started my implementation from it! Thanks a lot and all credits due!
About the proposed implementation here: https://mathiasbynens.be/notes/globalthis we can't use it: it creates a polyfill, not a ponyfill.
However I took a line from the "naive implementation".