How to define model properties of `Object` type?

Nobody has claimed this yet.

I have generated a model which results in `thing.model.ts`:

```
import {Entity, model, property} from '@loopback/repository';

@model()
export class Thing extends Entity {
@property({
type: 'string',
id: true,
required: true,
})
id: string;

@property({
type: 'string',
required: true,
})
name: string;

@property({
type: 'string',
required: true,
})
description: string;

@property({
type: 'object',
required: true,
})
attributes: object;

constructor(data?: Partial) {
super(data);
}
}

```

How do I go about defining the `attributes` object? Am I only able to do this by defining another `attributes` model? My searches provide information on doing this with LB3.x but that is using a .json file and not using `@property` decorators.

Start with the generated thing.model.ts example and the @property decorator usage shown in the issue. Check the current LoopBack model-property documentation for supported object definitions and compare it with the older LB3 guidance. Done should be a clear documented answer or example explaining how to define attributes.

Written by the indexing model from the issue text.