ESLint error while trying to deploy firebase functions

The only way I can imagine that your project got into this state is if you refused to allow npm to install dependencies at the time of project creation. So when you asks you this:

? Do you want to install dependencies with npm now?

You may have answered 'No'. This would prevent the eslint package from being installed, and you would see that error.

Otherwise, you may have deleted the eslint installed package under node_modules somehow. You can run npm install from the functions folder to recreate everything needed under node_modules.

Easy fix. Inside your package.json change

> "lint": "eslint ."

to

"lint": "eslint",

Had the same problem I reinstalled npm

npm install npm -g

then reinitiated the Firebase functions (you have to overwrite all files and make sure to install EsLine the debugging and install all dependencies ) yes press Y for any request

Firebase init functions

and everything worked just fine after deploying again

Firebase deploy

If you found -prefix "%REASOURCE_DIR%" run init type error while deploying firebase project, then you have to edit some code in firebase.json file. Here is an Example

hey you just need to return something from then statement

let params = {...};
var firestore = admin.firestore();
var dbRef = firestore.collection('your-collection-name');

dbRef.add(params)
     .then((docRef) => {
       console.log("doc added with ID ", docRef.id);

       return null
     })
     .catch((err) => {
       console.error("Error in adding document ", err);
     });