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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.
The error:
Cannot find module or type declarations for side-effect importdoesn't necessarily mean your CSS file is missing.
When importing a stylesheet such as:
import 'mapbox-gl/dist/mapbox-gl.css'TypeScript may complain because it doesn't have a declaration describing CSS modules.
This can become more visible when noUncheckedSideEffectImports is enabled.
For most Next.js and React applications, the simplest solution is to create a global declaration:
// global.d.ts
declare module '*.css' {}Then make sure global.d.ts is included in your tsconfig.json and restart the TypeScript server.
The key idea is:
TypeScript needs a declaration for the CSS module, while your bundler is responsible for resolving and processing the actual CSS file.
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