Mongoose hooks not working with Typescript

Question

So does anyone know why I might be getting a Typescript error when using a mongoose hook and referencing this. I am not using arrow functions, and I know about the lexical scoping issue with that, but even with anonymous functions like this:

UserSchema.pre("save", function(next) {
    console.log(this.password);
    next();
});

The exact error message is

'this' implicitly has type 'any' because it does not have a type annotation.

Anyone know how to get around this?

BTW I'm using Typescript 2.5.2 / NodeJS 8.2.1

Thanks!

Answer 1

Try this:

schema.pre("save", function(this: UserModel, next: any) {
  console.log(this.password);
  next();
});

I think you're getting the error because you probably have a typescript config which checks for implicit any. If you type 'this' in the arguments of the hook function, the error should be resolved.