Try `npm install @types/react-reveal` if it exists or add a new declaration (.d.ts) file containing `declare module 'react-reveal';` code example
Example: could not find a declaration file for module in react project
npm install @types/module-name
Inside the project create a folder called @types and added it to
tsconfig.json for find all required types from it . So it looks somewhat
like this -
And inside @types folder create a file called alltypes.d.ts .To find the unknown
types from it . so for me these were the unknown types and I added it over there.
declare module 'react';
declate module 'react-dom' ;
So now the typescript didn't complain about the types not found anymore .