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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.
may pass TypeScript's declaration check.
But the bundler still needs to resolve the actual file.
If it cannot, the build will fail.
This gives you a useful separation:
TypeScript validates the type system.
The bundler validates the actual asset.
When Should You Use an Exact CSS Declaration?
An exact declaration can make sense if you want TypeScript to be more restrictive.
For example:
declare module 'mapbox-gl/dist/mapbox-gl.css' {}This explicitly documents the CSS dependency your application expects.
It's useful when:
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