how add global scss styles and mixins to preact app

clear project – from doc

npx create preact-cli default ...
npm i node-sass@10 sass

I tried import to index.js:

import "./style/global.scss";
import App from "./components/app";

export default App;

but cant use mixins and var in components styles

SassError: Undefined mixin.
     @include br;
     ^^^^^^^^^^^

but when Im importing scss file into component scss – all works fine

how can I import globally scss file?