uap-core VS typescript-plugin-css-modules

import { css } from 'styled-components' // Works only on the client-side // For SSR we need have some Context to Provide User-Agent from request context to React application context const USER_AGENT = window.navigator.userAgent; // More details about browser detect regex // here - https://github.com/ua-parser/uap-core/blob/master/regexes.yaml export const checkIsIE10OrOlder = /MSIE /g.test(USER_AGENT); export const checkIsIE11 = /Trident\//g.test(USER_AGENT); export const checkIsEdge = /Edge\//g.test(USER_AGENT); export const checkIsFireFox = /Firefox\//gi.test(USER_AGENT); export const checkIsChrome = /Chrome\//gi.test(USER_AGENT); export const checkIsSafari = /Safari\//gi.test(USER_AGENT); export const checkIsYandex = /YaBrowser\//gi.test(USER_AGENT); export const styleIE11Browser = (...args) => checkIsIE11 ? css(...args) : null; export const styleEdgeBrowser = (...args) => checkIsEdge ? css(...args) : null; export const styleMicrosoftBrowsers = (...args) => checkIsIE11 || checkIsEdge || checkIsIE10OrOlder ? css(...args) : null; export const styleIsNotMicrosoftBrowsers = (...args) => !checkIsIE11 && !checkIsIE10OrOlder ? css(...args) : null; export const styleFireFoxBrowser = (...args) => checkIsFireFox ? css(...args) : null; export const styleSafariBrowser = (...args) => checkIsSafari ? css(...args) : null; export const styleYandexBrowser = (...args) => checkIsYandex ? css(...args) : null; export const browser = { ie: styleMicrosoftBrowsers, ie11: styleIE11Browser, edge: styleEdgeBrowser, notIE: styleIsNotMicrosoftBrowsers, firefox: styleFireFoxBrowser, moz: styleFireFoxBrowser, safari: styleSafariBrowser, yandex: styleYandexBrowser, };

Wild guess- does your project use a recent version of typescript-plugin-css-modules? If so, there’s a known issue that breaks WebStorm typecheck

But for VSCode we need setup TypeScript LS to use workspace version. For more information go here or here.