concurPromise

concurPromise is a utility function that prevents duplicate execution of identical Promise calls in a short time span, ensuring concurrent requests are only processed once.

Installation

You can install concurPromise via npm:

npm install concur-promise

Usage

Here is an example of how to use concurPromise in your project:

import concurPromise from "concur-promise";
import axios from "axios";

// Define a Promise function
const fetchData = (url: string) =>
  axios.get(url).then((response) => response.data);

// Wrap the Promise function with concurPromise
const concurrentFetchData = concurPromise(fetchData);

// Use the wrapped function
concurrentFetchData("https://api.example.com/data")
  .then((data) => {
    console.log(data);
  })
  .catch((error) => {
    console.error(error);
  });

API

concurPromise(promiseFn, [options])

Parameters

• promiseFn: The Promise function to be wrapped.
• options (optional): An options object with the following properties:
  • isEqual: A function to compare if two sets of arguments are equal. Defaults to lodash.isEqual.

Returns

• A new function that accepts the same arguments as promiseFn and returns a Promise.

Example

import concurPromise from "concur-promise";

const mock = () => new Promise(resolve => setTimeout(() => resolve(Math.random()), 1000))

const concurMock = concurPromise(mock);

concurMock().then(console.log) // 0.9504616758704281
concurMock().then(console.log) // 0.9504616758704281

License

This project is licensed under the MIT License.

Contributing

Contributions are welcome! Please open an issue or submit a pull request.

Acknowledgements

This utility function uses lodash.isequal for argument comparison.