Function HealthCheck

HealthCheck<T extends ClassType = ClassType>(name?: string): ClassDecorator
Declare a class as a health check.

Three statements in one, the way every declaration decorator works here:
1. It is a service. The container builds it, as a singleton, so the check holds the very client it is checking: the database pool, the cache, the queue.
2. It is reachable by name. The alias is bound as health:<name>, prefixed so a check named after a dependency never competes with the application's own binding for it.
3. It activates the module. Declaring a check is the whole setup.
Type Parameters
- T extends ClassType = ClassType
Parameters
- Optionalname: string
  What the report calls it. Defaults to the class name.
Returns ClassDecorator
A class decorator.
Example
```
@HealthCheck('database')
export class DatabaseCheck {
  constructor (private readonly db: Database) {}
  async check (): Promise<boolean> { return await this.db.ping() }
}
```