React, Typescript - Cannot find module … or its corresponding type declarations

20
votes

I created a new project using create-react-app and yarn 2 in vs code. The editor throws errors while importing every installed library like this:

Cannot find module 'react' or its corresponding type declarations.

The project compiles and runs successfully but the errors are still there. When I change the file's extension to .js and .jsx form .ts and .tsx, the errors disappear. How should I solve this problem for typescript files?

2
reactjstypescriptvisual-studio-codecreate-react-appyarnpkg

2 Answers

21
votes

You need to install types for libraries you install. generally you should do:

npm install @types/libName // e.g. npm install @types/react-leaflet

Some times there's no types available in DefinitelyTyped repo and you encounter npm ERR! 404 Not Found: @types/my-untyped-module@latest. You can do several things in this occasion:

1- Create a decs.d.ts file in root of your project and write in it:

    declare module "libName" // e.g declare module 'react-leaflet'

2- Or simply suppress the error using @ts-ignore:

// @ts-ignore  
import Map from 'react-leaflet'

3- Or you can do yourself and others a favor and add the library types in DefinitelyTyped repo.

If it still doesn't work, I firstly recommend that you use a recent version of Typescript. if you do, then close your editor, delete node_modules folder and install the dependencies again (npm install or yarn install) and check it again.

19
votes

I had the same error message, also related to the imports.

In my case, the problem was caused by importing a png file in order to use it in an SVG:

import logo from 'url:../../public/img/logo.png';

The message I received was:

Cannot find module 'url:../..public/img/logo.png' or its corresponding type declarations.

Solution:

In project root is a file css.d.ts. One must declare a module for the various graphics extensions (types) that are imported. (Note: Not for graphics types that are used or referenced in the project, but for those that are imported )

Here is the complete css.d.ts file for this project:

declare module '*.scss' {
  const css: { [key: string]: string };
  export default css;
}
declare module '*.sass' {
  const css: { [key: string]: string };
  export default css;
}
declare module 'react-markup';
declare module '*.webp';
declare module '*.png';
declare module '*.jpg';
declare module '*.jpeg';