feat(core): Add async mapping support with Promises

[koenigstag]

Description

As a developer, I want my async mappings to work, so I've added promise support.

Proposed Changes

Implement a new boolean parameter isAsync to indicate a request for async operations.

Add conditional return of Promise which does async mapping operations inside.

Add type safety for return value with typescript conditional types.

Checklist

• Tests
• Documentation

[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[koenigstag]

Quoting the fake-async docs:

Real async support can be achieved by some Isomorphic Worker that would execute the map operations on the Worker thread

Can someone please explain - why do we need a Node.js Worker thread instead of Promise which are more common?

[vellotis]

Quoting the fake-async docs:

Real async support can be achieved by some Isomorphic Worker that would execute the map operations on the Worker thread

Can someone please explain - why do we need a Node.js Worker thread instead of Promise which are more common?

Hi @koenigstag. Great work for supporting the async/Promised approach!

My opinion is that the fake-async doesn't solve the problem. Long-living non-blocking IO operations may take a lot more time than the fake-async operation that is pushed to the (FIFO) event loop.

Your implementation is the appropriate solution, not the suggested fake-async one.

[koenigstag]

@nartc Sorry to ping you, but since this Pull Request is almost a year old, please review.

[koenigstag]

I'm closing this PR in favor of #622