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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.
Your existing tsconfig.json may already include the relevant files, so don't blindly replace your configuration.
Check the include section and make sure your declaration file is covered.
Restart the TypeScript Server
If the error remains after creating global.d.ts, your editor may still be using an old TypeScript language-server state.
In VS Code, open the Command Palette:
Cmd + Shift + PThen run:
TypeScript: Restart TS ServerYou can also restart your development server if necessary.
After that, the CSS import should be recognized.
Wildcard CSS Declaration vs. Exact Module Declaration
There are two ways you can declare CSS modules.
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