SyncPromise

SyncPromise is an incomplete implementation of Promise API. SyncPromise executes your Promise based code synchronously.

Why

Because sometimes you need to test your Promise based code in a sync scenario.

Features

• Small
• ES6 based
• With tests
• Most of new Promise()
• Most of Promise.prototype.then
• Most of Promise.resolve
• Most of Promise.reject
• Most of Promise.all

Restrictions

Can't handle Promise.prototype.catch for obvious reasons.

Differences from ECMAScript promises

• Throws when SyncPromise callback ends without resolving the promise
• Throws when attempting to resolve an already resolved promise
• No Promise.prototype.catch
• No Promise.prototype.race (we accept patches!)
• Some other things probably missing...