Mongo shell script - How to use libraries?

Question

In a Mongo shell script I need to read a file to delete documents by _id but I can't import the FileReader library.

I launch script from bash to do simple find() and it works:

mongosh --host xxx --port 27017 --username xxx --password xxx --eval "var country='$country';var file='$inputDataFile'" --file scriptFile.js

But whenever I try to import a library in the js it shows the error:

TypeError: Cannot assign to read only property 'message' of object 'SyntaxError: 
'import' and 'export' may appear only with 'sourceType

The same js file I call from nodejs and the import is correct.

Right now I do the deletion of _ids contained in a file using nodejs. I would like to find a way to use Mongo shell script for all my queries

Answer 1

I managed to solve my problem with the help of Include External Files and Modules in Scripts

1- Create package.json in the same directory as your js 2- Add the necessary libraries to package.json 3- Install libraries 4- Use require to import it

Code

var fs = require('fs');
console.log(country)
console.log(file)
db = db.getSiblingDB('mongotest')

const allFileContents = fs.readFileSync(file, 'utf-8');
var lines = allFileContents.split("\r")

for (var i = 0; i < lines.length; i++) {
  const user = JSON.parse(lines[i]);
  var userId = user._id
  if (!(userId instanceof ObjectId)) {
    userId = new ObjectId(userId);
  }
  db.userChat.deleteOne({ _id: userId })
}

Thanks for your help