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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.
Tool | Responsibility |
|---|---|
TypeScript | Type checking and module declarations |
Next.js / bundler | Resolving and processing the actual CSS file |
The wildcard declaration tells TypeScript that CSS imports are valid.
It does not disable the bundler's file resolution.
Why the Wildcard Declaration Is Usually the Best Choice
For most React and Next.js applications, this is the most practical solution:
declare module '*.css' {}There are several reasons.
1. Less Configuration
You don't have to register every CSS file manually.
Without a wildcard declaration, you might end up with:
declare module 'mapbox-gl/dist/mapbox-gl.css' {}
declare module 'react-quill-new/dist/quill.snow.css' {}
declare module 'some-datepicker/styles.css' {}
declare module 'some-editor/dist/editor.css' {}As your application grows, this becomes difficult to maintain.
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