# PLJS Versioning Policy

PLJS generally follows [Semantic Versioning](https://semver.org) with some PLJS specific changes.

Support for major and minor versions of PLJS ends three (3) years after the release of the following version. On a case-by-case basis, we will extend support for back-ported regressions.

### Determining your PLJS Version

You can use two ways to determine which version of PLJS you are using:

```sql
SELECT pljs_version();
```

and

```sql
DO $$ pljs.elog(NOTICE, pljs.version); $$ LANGUAGE pljs;
```

## Major Version

Major versions increments with major changes in the codebase that could affect users and their code in a significant manner. Any changes that could impact a users experience such as a major performance change or breaking change of existing behavior warrants a major version change.

## Minor Version

Minor versions increment when there is a possibility of changes that can affect execution, but where the amount of code changed is minimal and thus those changes have minimal impact on user code. Changes could include:

- Additional functionality added as per the roadmap
- Bug fixes and refinements
- Fixes for diagnostic issues such as avoiding the use of `is` in code, as flagged by PLJS diagnostics

The goal is to avoid disruptive changes between minor releases.

## Patch Versions

Patch versions increment with a bug fix or minor improvement. Some minor version releases will include experimental code enabled at compile-time, disabled by default.

## PLJS Version Support

PLJS versions are generally supported at the minor release level for three (3) years after release.

| PLJS Version | PLJS Release Date | End of PLJS Support Date |
| ------------ | ----------------- | ------------------------ |
| 1.0          |                   |                          |

## Bugs

In general, bugs are fixed with each minor release of PLJS.

### Back-porting of Patches

Back-porting of patches to a previous minor version is on a case-by-case basis. Generally if a version of PLJS is beyond its support window, and not generally offered, then no back-porting of bug fixes will occur.

## Postgres Version Support

PLJS maintains Postgres support for the current four (4) major releases of Postgres at a PLJS minor version level.