Alter the entity type when passing it as a parameter

Trying to alter the Entity type, I am invoking a function that requires two parameters - one being the entity and the other a location. However, when trying to assign a Type for the first entity, it throws an error:

Error: Argument of type 'Node<EntityBasic>' is not compatible with parameter of type 'Node<AlertBasic>'.
  Type 'EntityBasic' cannot be assigned to type 'AlertBasic'.
    Property 'id' is optional in type 'EntityBasic' but mandatory in type 'AlertBasic'.

The function in question is as follows:

public async func() {
 const entBasic: EntityBasic = this.getEntity(entity);
 const NEO4J_TYPE = entType === 'alert' ? 'Alert' : 'Guide';

 const entNode = await this.neo4jService.createOrUpdate<EntityBasic>(
      NEO4J_TYPE,
      entBasic.id,
      entBasic,
    );

 if (NEO4J_TYPE === 'Alert')
      await this.calendarEventsSyncService.handleEvents(entNode, location); 
}

I need to change entNode from EntityBasic to AlertBasic.
I have tried the following:

if (NEO4J_TYPE === 'Alert')
      await this.calendarEventsSyncService.handleEvents(entNode: AlertBasic, location);

But it returns an error

Expected 2 parameters instead of 3

Answer №1

It seems like the only way to declare a function signature is by using entNode: AlertBasic. Calling a function, as you are doing here, requires a different approach.

if (NEO4J_TYPE === 'Alert')
      await this.calendarEventsSyncService.handleEvents(entNode: AlertBasic, location);

There are various methods to resolve this issue and determining the best one depends on the overall system architecture.

One potential solution involves a bit of risk: utilizing 'as'

You can use the 'as' keyword in TypeScript to indicate that one type should be treated as another. However, this can introduce complications since it essentially involves deceiving the system.

if (NEO4J_TYPE === 'Alert')
      await this.calendarEventsSyncService.handleEvents(entNode as Node<AlertBasic>, location);

Another option is to transform the type before usage

You might consider transforming one type into another using a designated function with a signature similar to:

function transform_AlertBasic_toEntityBasic( alert_basic: AlertBasic ): EntityBasic {
   // ... code for performing the transformation
}

Lastly, explore if there exists a common superclass

If there is a superclass that encompasses both types, utilizing its API could offer a viable solution.

Answer №2

To convert entNode to a Node<AlertBasic>, you can use the following code:

 await this.calendarEventsSyncService.handleEvents(entNode as Node<AlertBasic>, location);

If there is a conflict between the AlertBasic and EntityBasic interfaces, you can resolve it by executing:

 await this.calendarEventsSyncService.handleEvents(entNode as unknown as Node<AlertBasic>, location);

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