Uncaught ReferenceError: PIXI is not defined

[NexganGH]

I've installed the library with NPM and I have this in my index.ts file (as by guide):

import * as PIXI from "pixi.js";
import "pixi-keyboard";

However, when I perform npm run dev and access my game on the webserver, nothing renders and I get this error in console:

Uncaught ReferenceError: PIXI is not defined
    keyboard pixi-keyboard.js:1
    n pixi-keyboard.js:1
    keyboard pixi-keyboard.js:1
    n pixi-keyboard.js:1
    keyboard pixi-keyboard.js:1
    n pixi-keyboard.js:1
    keyboard pixi-keyboard.js:1
    <anonymous> pixi-keyboard.js:1
    js game-library.js:596
    __webpack_require__ game.js:849
    fn game.js:151
    <anonymous> index.ts:2
    ts game.js:997
    __webpack_require__ game.js:849
    fn game.js:151
    0 game.js:1046
    __webpack_require__ game.js:849
    checkDeferredModules game.js:46
    <anonymous> game.js:925
    <anonymous> game.js:928
pixi-keyboard.js:1
    keyboard pixi-keyboard.js:1
    n pixi-keyboard.js:1
    keyboard pixi-keyboard.js:1
    n pixi-keyboard.js:1
    keyboard pixi-keyboard.js:1
    n pixi-keyboard.js:1
    keyboard pixi-keyboard.js:1
    <anonima> pixi-keyboard.js:1
    js game-library.js:596
    __webpack_require__ game.js:849
    fn game.js:151
    <anonima> index.ts:2
    ts game.js:997
    __webpack_require__ game.js:849
    fn game.js:151
    0 game.js:1046
    __webpack_require__ game.js:849
    checkDeferredModules game.js:46
    <anonima> game.js:925
    <anonima> game.js:928

It gets fixed if I remove import "pixi-keyboard";.

I'm running on Pixi.js 5.3.3, Pixi Viewport 4.17.1, Pixi Keyboard 1.0.0 Please, tell me if I need to provide any other information.

Any help? Thanks.