# What changed in geostyler-style

> 8 changes in geostyler-style 12 to 13 from its official release notes, upgrade guides and advisories: 3 breaking, 5 new APIs and options. Each one cited. Sources checked 2026-10-25. HTML: https://unstale.sh/npm/geostyler-style/

To see which of these apply to a repository, run `npx @unstale/cli init` in it.

## geostyler-style 13

### Breaking changes

- Now also checks for GeoStylerUnknownFunction; callers may need to narrow the result by checking that isGeoStylerUnknownFunction is false. (13.0.0) — [release notes](https://github.com/geostyler/geostyler-style/releases/tag/v13.0.0)
- Now also checks for GeoStylerUnknownFunction; callers may need to narrow the result by checking that isGeoStylerUnknownFunction is false. (13.0.0) — [release notes](https://github.com/geostyler/geostyler-style/releases/tag/v13.0.0)
- Now also checks for GeoStylerUnknownFunction; callers may need to narrow the result by checking that isGeoStylerUnknownFunction is false. (13.0.0) — [release notes](https://github.com/geostyler/geostyler-style/releases/tag/v13.0.0)

### New APIs and options

- Adds GeoStylerGeometryFunction to FunctionCall, so checks on FunctionCall may need to account for the added interface. (13.0.0) — [release notes](https://github.com/geostyler/geostyler-style/releases/tag/v13.0.0)
- Adds FstartPoint, FendPoint, and Fcentroid geometry functions, so checks on GeoStylerGeometryFunction may need to distinguish these variants. (13.0.0) — [release notes](https://github.com/geostyler/geostyler-style/releases/tag/v13.0.0)

## geostyler-style 12

### New APIs and options

- The Expression type now supports geometry as a type parameter. (12.0.0) — [release notes](https://github.com/geostyler/geostyler-style/releases/tag/v12.0.0)
- Geometry is added to the base symbolizer. (12.0.0) — [release notes](https://github.com/geostyler/geostyler-style/releases/tag/v12.0.0)
- GeoStylerUnknownFunction is extended to support custom functions. (12.0.0) — [release notes](https://github.com/geostyler/geostyler-style/releases/tag/v12.0.0)