.deep.members always throws a TypeError

hello,

i upgraded chai in a project from 3.5.0 to 4.1.2 and got a lot of errors from comparing arrays of objects with .deep.equal. i checked the changelog and saw that checking equality has been changed a lot so i tried to rewrite those test with .members. i tried

expect([{
  type: 'whatever',
  payload: {
    message: 'blablabla'
  }
}).to.have.deep.members([{
  type: 'whatever',
  payload: {
    message: 'blablabla'
  }
}])

but got a TypeError: Right-hand side of 'instanceof' is not an object. i tried every combination of .members, .deep, .ordered and maybe .include with no luck. at the end i copied the example

expect([{a: 1}]).to.have.deep.members([{a: 1}]);

from the documentation but got the same TypeError. what am i missing?

[meeber]

@gex I think something else is going on. Your last example works fine for me; I copied and pasted it into a new project with nothing but Chai 4.1.2 and Mocha. The first example is missing a ] to close the first array, but once that’s fixed, it works fine for me too. May be worth deleting node_modules and reinstalling dependencies. I also wonder if there could be a package-lock.json issue. Since your stand-alone examples work, it’s hard to speculate what the problem is that’s causing errors in your project.

[keithamus]

Hilariously this is the issue we tried to solve with the patch to type-detect. Back to the drawing board I guess.