JSON Schema exemple not working with jest

**ajv version: "^8.11.0"**

### It doesn't even compile :(

//schema.spec.ts
```typescript
test('', async () => {
interface MyData {
foo: number
bar?: string
}

const schema: JSONSchemaType = {
type: 'object',
properties: {
foo: { type: 'integer' },
bar: { type: 'string', nullable: true }
},
required: ['foo'],
additionalProperties: false
}

// validate is a type guard for MyData - type is inferred from schema type
ajv.compile(schema)
})
```

Console:

schema is invalid: data/type must NOT have additional properties, data must have property 'ref', data/type must be equal to one of the allowed values, data must have property 'enum', data must have property 'elements', data/properties/foo/type must NOT have additional properties, data/properties/foo must have property 'ref', data/properties/foo/type must be equal to one of the allowed values, data/properties/foo must have property 'enum', data/properties/foo must have property 'elements', data/properties/foo must have property 'properties', data/properties/foo must have property 'optionalProperties', data/properties/foo must have property 'discriminator', data/properties/foo must have property 'values', data/properties/foo must match a schema in union, data must have property 'optionalProperties', data must have property 'discriminator', data must have property 'values', data must match a schema in union