How to override type definitions provided by a third party module

@Deno AI Helper How do I override type definitions provided by a third party module

7 Replies

I'm sorry, but I wasn't able to find the answer to your question in the official Deno documentation. If you could provide me with more details or the specific issue you're encountering, I might be able to spot any obvious syntax errors or mistakes in your message. Please note that any advice I give is not based on the Deno documentation, and I recommend double-checking the accuracy of the advice given. If you have a code snippet or a particular error message, feel free to share it, and I'll do my best to assist you with the information provided.

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177177177OP•12mo ago

How do I override type definitions provided by a third party module

Deno AI Helper•12mo ago

To override type definitions provided by a third-party module in Deno, you can use the @deno-types compiler hint. This hint allows you to specify a different .d.ts file that should be used for type checking instead of the default types provided by the module. Here's how you can do it: 1. Create your own .d.ts file with the type definitions you want to use. 2. Before the import statement of the third-party module, add a comment with @deno-types pointing to your custom type definition file. Here's an example of how to use the @deno-types compiler hint:

// @deno-types="./my_custom_types.d.ts"
import * as someLibrary from "https://example.com/some_library.js";

// @deno-types="./my_custom_types.d.ts"
import * as someLibrary from "https://example.com/some_library.js";

In this example, Deno will use the types defined in my_custom_types.d.ts when type checking the usage of someLibrary instead of the default types provided by the module at https://example.com/some_library.js. The documentation also mentions that the pattern matching for the compiler hint is somewhat forgiving and will accept quoted and non-quoted values for the specifier, as well as whitespace before and after the equals sign. Remember that this approach is useful when you are consuming a JavaScript module and have either created your own types or obtained the types you want to use. It allows you to instruct Deno to use your file when type checking instead of the JavaScript file. 🦕

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Deno AI Helper•12mo ago

🦕💚 I'm glad I was able to help!

177177177OP•12mo ago

Can you implement WebSocketStream by using WebSocket and TransformStream ?

Deno AI Helper•12mo ago

I'm sorry, but I wasn't able to find the answer to your question in the official Deno documentation. However, based on your question, it seems you are interested in implementing a WebSocketStream interface using WebSocket and TransformStream. In the context of Deno and web standards, WebSocketStream is a relatively new addition to the web platform that provides a streams-based API for WebSockets, making it easier to work with streaming data. As of my knowledge cutoff in early 2023, WebSocketStream is not yet available in Deno, but it is a proposed feature. To implement a similar streams-based interface using WebSocket and TransformStream, you would need to create a wrapper that uses a WebSocket to send and receive messages and a TransformStream to handle the stream transformation logic. Here's a very high-level and abstract example of how you might start to structure such a wrapper:

class WebSocketStreamWrapper {
  constructor(url) {
    this.socket = new WebSocket(url);
    this.readable = new ReadableStream({
      // Implement the logic for reading from the WebSocket
    });
    this.writable = new WritableStream({
      // Implement the logic for writing to the WebSocket
    });
  }
  
  // You would need to implement methods to interact with the WebSocket
  // and handle the stream of data, including any necessary transformations.
}

// Usage
const webSocketStream = new WebSocketStreamWrapper('wss://example.com/socket');
const reader = webSocketStream.readable.getReader();
const writer = webSocketStream.writable.getWriter();

// Read and write data using the reader and writer...

class WebSocketStreamWrapper {
  constructor(url) {
    this.socket = new WebSocket(url);
    this.readable = new ReadableStream({
      // Implement the logic for reading from the WebSocket
    });
    this.writable = new WritableStream({
      // Implement the logic for writing to the WebSocket
    });
  }
  
  // You would need to implement methods to interact with the WebSocket
  // and handle the stream of data, including any necessary transformations.
}

// Usage
const webSocketStream = new WebSocketStreamWrapper('wss://example.com/socket');
const reader = webSocketStream.readable.getReader();
const writer = webSocketStream.writable.getWriter();

// Read and write data using the reader and writer...

This is a conceptual example and does not include the actual implementation details. You would need to handle the WebSocket events, such as open,

Deno AI Helper•12mo ago

message, error, and close, and integrate them with the ReadableStream and WritableStream interfaces to create a seamless streaming experience. Please note that this advice is not based on the Deno documentation, and I advise you to double-check the accuracy of the advice given. If you decide to implement this, you will need to carefully design the wrapper to handle backpressure, errors, and other aspects of stream management.

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