'Unrecognized pipeline stage name: ‘$unionWith’”

I’m using "mongodb": "^4.4.1" version for NodeJS. I'm trying to make the following query:

db.collection('myCollection').aggregate([
  {
    $unionWith: {
      coll: "anotherCollection"
    }
  }
])

But i have the following error : “Unrecognized pipeline stage name: ‘$unionWith’”

Can you explain to me why am I getting this error?

I tried to explore the mongo signatures in node_modules/mongodb/src/cursor/aggregation_cursor.ts but there is no unionWith signatures.

node.jsmongodb


Solution 1:[1]

Okay, i found the solution, it's my fault i made a mistake. It was working perfectly at node.js runtime, but the error was thrown during the jest unit tests. Because i forgot to update the mongodb memory server version for jest usage.

module.exports = {
  mongodbMemoryServerOptions: {
    binary: {
      version: '5.0.6',
      skipMD5: true,
    },
    autoStart: false,
    instance: {},
  },
};

It's working perfectly now.

Thank for your time and have a good day.

Sources

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Source: Stack Overflow

Solution Source
Solution 1 mickatdj

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