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How to Fix "Cannot Find Module or Type Declarations for Side-Effect Import" in TypeScript
Learn how to fix the TypeScript TS2882 error for CSS imports, understand noUncheckedSideEffectImports, and use declare module '*.css' in Next.js.
Option 1: Wildcard Declaration
The most common approach is:
declare module '*.css' {}This covers all CSS modules.
For example:
import './styles.css'
import './components.css'
import 'mapbox-gl/dist/mapbox-gl.css'
import 'some-library/dist/styles.css'Option 2: Exact Module Declaration
You can also declare specific CSS files:
declare module 'mapbox-gl/dist/mapbox-gl.css' {}
declare module 'react-quill-new/dist/quill.snow.css' {}This approach is more restrictive.
Only the explicitly declared modules are covered.
Is declare module '*.css' Safe?
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