2-thenable

Convert object into a thenable

Useful when we want to imply an asynchronous representation onto some non-promise object.

Having that target object can be combined into promise chains or async/await syntax. One use case would be turning a stream instance so it's also a promise.

Installation

npm install 2-thenable

How it works

Utility takes target and promise arguments. target is object to be extended with then, catch and finally methods. While promise is expected to be a native promise instance that reflects resolution which should be mapped onto target

Usage

Example of converting stream to thenable

const toThenable = require("2-thenable");
 
// Example of converting a simple utf8 string stream to thenable
toThenable(stream, new Promise((resolve, reject) => {
    let result = '';
    stream.on('error', reject);
    stream.on('data', data => (result += data));
    stream.on('end', () => resolve(result));
});
 
stream.then(result => {
    console.log("Cumulated string data", result);
});

Tests

npm test