Node.js Stability Ratings

Stability ratings: 0-5

0 - Deprecated.  This feature is known to be problematic, and changes are
planned.  Do not rely on it.  Use of the feature may cause warnings.  Backwards
compatibility should not be expected.

1 - Experimental.  This feature was introduced recently, and may change
or be removed in future versions.  Please try it out and provide feedback.
If it addresses a use-case that is important to you, tell the node core team.

2 - Unstable.  The API is in the process of settling, but has not yet had
sufficient real-world testing to be considered stable. Backwards-compatibility
will be maintained if reasonable.

3 - Stable.  The API has proven satisfactory, but cleanup in the underlying
code may cause minor changes.  Backwards-compatibility is guaranteed.

4 - API Frozen.  This API has been tested extensively in production and is
unlikely to ever have to change.

5 - Locked.  Unless serious bugs are found, this code will not ever
change.  Please do not suggest changes in this area, they will be refused.