@fbem/utils 
@fbem/utils is a package which contains useful utils for functional BEM.
Getting started
npm i @fbem/utilsAPI
compose: (...fns: BemFunction[]) => BemFunction
Description
Use this function when you have multiple style files (e.g. a separate file for each modifier) to
compose different BEM functions into one. compose merges interfaces fields and their types. Take a look below.
Example #1
import { compose } from '@fbem/utils';
// or import compose from '@fbem/utils/dist/compose';
import { cnButton as modDisabled } from './_disabled/button_disabled.css';
import { cnButton as modStyle } from './_style/button_style.css';
import { cnButton as base } from './button.css';
const cnButton = compose(base, modDisabled, modStyle);
cnButton({ style: 'flat', disabled: true }, ['mix']); // 'button button_style_flat button_disabled mix'Example #2
import { compose } from '@fbem/utils';
// or import compose from '@fbem/utils/dist/compose';
import { cnButton as modTypePrimary } from './_type/_primary/button_type_primary.css';
import { cnButton as modTypeSecondary } from './_type/_secondary/button_type_secondary.css';
import { cnButton as base } from './button.css';
const cnButton = compose(base, modTypePrimary, modTypeSecondary);
cnButton({ type: 'primary' }); // 'button button_type_primary'