Contents
How do I use Bluebird NPM?
Generating promises with the BlueBird library
- Step 1) Installing the NPM Modules.
- npm install bluebird.
- Step 2) The next step is to include the bluebird module in your code and promisify the entire MongoDB module.
- Code Explanation:-
What is promises How do you use promises?
A promise may be in one of 3 possible states: fulfilled, rejected, or pending. Promise users can attach callbacks to handle the fulfilled value or the reason for rejection. Promises are eager, meaning that a promise will start doing whatever task you give it as soon as the promise constructor is invoked.
What is Bluebird for?
The Bluebird card, offered by American Express, is an FDIC-insured prepaid debit card with virtually no fees. It functions almost like a checking account, making it a useful substitute for consumers who don’t have a bank account.
How to create a new promise in Bluebird?
new Promise. Create a new promise. The passed in function will receive functions resolve and reject as its arguments which can be called to seal the fate of the created promise. Note: See explicit construction anti-pattern before creating promises yourself.
When do I get an error in Bluebird?
When using longStackTraces the first line in your code after requiring Bluebird should be: See the API page about Promise.longStackTraces You can get this error when you’re trying to call .value or .error when inspecting a promise where the promise has not been fulfilled or rejected yet.
What are the global variables in Bluebird browser?
When using script tags the global variables Promise and P (alias for Promise) become available. Bluebird runs on a wide variety of browsers including older versions. We’d like to thank BrowserStack for giving us a free account which helps us test that.
Can a async function return a Bluebird promise?
Unfortunately there is no way to get async functions to return Bluebird promises. Even if you set global.Promise = require (‘bluebird’);, async functions will still return native promises. Should You Use Bluebird or Native Promises?