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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.
A common concern is that:
declare module '*.css' {}could cause TypeScript to accept a CSS file that doesn't actually exist.
That's true.
For example:
import 'mapbox-gl/dist/fake-file.css'could satisfy TypeScript's module declaration because it matches:
*.cssHowever, this does not mean the nonexistent file will work at runtime.
Your bundler still needs to resolve the actual file.
If the file doesn't exist, the application build can still fail with a module resolution error.
This means there are two different responsibilities:
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