fix(javascript): update Predict models error spec

[francoischalifour]

🧭 What and Why

🎟 JIRA Ticket: PRED-544

Changes included

This adapts the new error format of the Predict backend when a model is requested but that it's not available.

Here's the new response format:

{
  "user": "user_1",
  "predictions": {
     "funnel_stage": {
        "error": "The funnel_stage prediction is not available."
     }

  }
}

Changes:

• Added the new optional error key in each model
• Made value and lastUpdatedAt optional now, because they may not exist if there's an error

Maybe that we could use smarter conditional types to infer that value and lastUpdatedAt do exist when there's no error.

🧪 Test

None added.

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[millotp]

Looks good,
To keep the required it could be done with a oneOf, however it would also create intermediary types that are not very friendly, this works fine for me

[shortcuts]

Yep I'd personally go with a oneOf that does something like

funnel_stage:
  oneOf:
    - '#/funnelStage'
    - '#/error'

funnelStage:
  type: object
  description: Prediction for the **funnel_stage** model.
  properties:
    value:
      type: array
      items:
        title: funnel_stage
        type: object
        properties:
          name:
            type: string
          probability:
            type: number
            format: double
            minimum: 0
            maximum: 1
        required:
          - name
          - probability
    lastUpdatedAt:
      type: string
  required:
    - value
    - lastUpdatedAt

error:
  type: object
  description: The error when the requested model is not available
  properties:
    error:
      type: string

And similar for other objects to re-use the error thing

[shortcuts]

tbh I did not knew my suggestion would work gg

It seems that there's duplicate names (ef67c7e#diff-ff4658ef4480ca1020bc6ddcd1e8b6fe043d35d4d28f18d5831f9df2dc53bb66R9), you might need to find an other name

[shortcuts]

Looks great!