CODEWITHSUNDEEP
typescript
Wagner Fillio
Wagner Fillio

Reputation: 405

typecript promise return type asynchronous function

I have this asynchronous function and am trying to return an object or null.

But I get an error in defining the type.

How to define this data type?

const checkIsValidConnection = async (number: string): Promise<string | null> => {
  const defaultConnection = await GetDefaultConnection();

  const wbot = getWbot(defaultConnection.id);

  const contactId = await wbot.getNumberId(`${number}`);

  return contactId;
};

export default checkIsValidConnection;

Type 'ContactId | null' is not assignable to type 'string | null'.
Type 'ContactId' is not assignable to type 'string'.

enter image description here

Upvotes: 1

Views: 92

Answers (1)

PKiong
PKiong

Reputation: 551

I believe you're working with https://github.com/pedroslopez/whatsapp-web.js/blob/master/index.d.ts

which indicates WAWEBJS.ContactID to be an interface of the following.

interface ContactId { server: string, user: string, _serialized: string}

You should update the return type of your promise to either this interface or stick to the WAWEBJS.ContactID

Upvotes: 2

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