Angular - Could not find a declaration file for module 'file-saver'

Question

In my Angular-12 project I installed file-saver:

npm install [email protected]

npm install --save exceljs

ng generate service services/export-excel

Then in the export-excel service, I added:

import * as fs from 'file-saver';

I got file-saver highlighted

with this error:

Could not find a declaration file for module 'file-saver'. 'c:/xampp/htdocs/myapp/node_modules/file-saver/dist/FileSaver.min.js' implicitly has an 'any' type. Try npm i --save-dev @types/file-saver if it exists or add a new declaration (.d.ts) file containing declare module 'file-saver';

But I didn't use:

@types/file-saver

How do I get this error resolved?

Thanks

Answer 1

Add

"file-saver": "~2.0.5"

to the dependencies section in the package.json file, and remove it from the devDependencies section.

Answer 2

Additional typescript definitions

npm install @types/file-saver --save-dev

Answer 3

I just solved a similar error with the same error message (I am working currently in a Angular 13 proyect), there is a solution first you will have to create a folder called 'types' in the same folder level of src:

then inside that folder create another folder with your module name 'file-saver' in this case and inside there a file called 'index.d.ts'

The final result need to look something like:

Last step is to put inside index.d.ts the following code:

declare module 'file-saver';