maplibre/martin

Support for merging styles into one, similar to sources

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#1,928 opened on Jul 17, 2025

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help wantedserving

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Description

It is currently possible to merge multiple tile sources (composite sources), e.g. /{source1},…,{sourceN}/{z}/{x}/{y}. We need to allow the same thing for styles:

/style/{style1},…,{styleN}

When merging:

  • combine the list of styling rules in the order provided by the user
  • combine the list of sources into a single list, de-duplicating them
    • TODO: in case a of a duplicate URL, but different data source name, we may need to update the style to use the new source name
  • consider merging tile sources into a single composite source request
  • combine fonts and sprites

Contributor guide

Research direction
Examine the existing source merging implementation in 'sources composite' and apply similar logic for styles. Start by handling the style URL pattern and combining rules.
Tech stack
rust
Domain
backendapi
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
Rust
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60