aggregate $match Error: Type 'ObjectId' is not assignable to type 'Expression'.

[sm-hejazi]

Prerequisites

• I have written a descriptive issue title
• I have searched existing issues to ensure the bug has not already been reported

Mongoose version

6.4.0

Node.js version

16.14.0

MongoDB server version

5.0.9

Description

update to latest version and get error on aggregate

  await Model.aggregate([
                  {
                      $match: { _id: new mongoose.Types.ObjectId('stringObjecId') },
                  },
  ]);

get Error Type 'ObjectId' is not assignable to type 'Expression'.
how to solve this?

Steps to Reproduce

  await Model.aggregate([
                  {
                      $match: { _id: new mongoose.Types.ObjectId('stringObjecId') },
                  },
  ]);

Expected Behavior

No response

[andreialecu]

I think you can work around it with {$match: { _id: {$eq: new mongoose.Types.ObjectId('stringObjecId')} }, but this seems like a bug with the types.

I'm also seeing an error with something like:

According to MongoDB docs, you can compare with null to match either non-existant or null values, but the types do not seem to allow this.

[andreialecu]

Found more things that are being broken by the types. All 3 of these here:

Errors:

Type '{ $ifNull: string[]; }' is not assignable to type 'AnyExpression'.
      Object literal may only specify known properties, and '$ifNull' does not exist in type 'any[] | NativeDate | ArrayElemAt | First | Last | Reduce | ConcatArrays | Filter | Map | ObjectToArray | ... 118 more ... | ToObjectId'.

Type '{ $exists: true; }' is not assignable to type 'Expression'.
      Object literal may only specify known properties, and '$exists' does not exist in type 'ArrayElemAt | First | Last | Reduce | ObjectToArray | RegexFindAll | Split | SetDifference | ... 132 more ... | Rank'.

Overload 2 of 2, '(pipeline: PipelineStage[], callback?: Callback<{ type: string; language: string; deviceTokens: string[]; }[]> | undefined): Aggregate<{ type: string; language: string; deviceTokens: string[]; }[]>', gave the following error.
    Type 'null' is not assignable to type 'Expression'.

[andreialecu]

I opened #11956, which should fix this.

[jyeros]

I am having a similar issue, I am trying $ne: ['$$indexNotNull', null], but types doesn't allow null as a second parameter. A fix could be add null as second parameter with an union type. But, I think null is a literal expression in mongo.

[vkarpov15]

@jyeros this should be fixed in 6.4.3 with 9f3f8eb .