[TypeScript] Provide two types of callback for a subscription

[minggangw]

Currently, the type of callback for a subscription is defined as:

type SubscriptionCallback<T extends TypeClass<MessageTypeClassName>> =
  (message: MessageType<T> | Buffer) => void

which causes a type error when pass a callback either for a normal message or raw message.

This patch provides two types of callback for a subscription, which are:

1. For a normal message

type SubscriptionCallback<T extends TypeClass<MessageTypeClassName>> =
  (message: MessageType<T>) => void;

2. For a raw message:

type SubscriptionWithRawMessageCallback =
  (message: Buffer) => void;

After this patch, we can use the correct callback type for a subscription, like:

subscription = node.createSubscription(
  TYPE_CLASS,
  TOPIC,
  { isRaw: true },
  (message: Buffer) => {
    const receivedRawMessage = message;
  }
);

Fix: #1013

[Copilot]

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

Comments suppressed due to low confidence (1)

test/types/main.ts:250

• The comment should be updated to maintain consistency with other comments. Suggested change: // $ExpectType Subscription

// $ExpectType Subscription receiving raw message