Add a Scala Library Dependency

Important constraints

• Golem Scala components compile to WebAssembly via Scala.js. Only Scala.js-compatible libraries will work.
• The artifact must be a Scala.js artifact — use the %%% operator (triple percent) in build.sbt so sbt resolves the _sjs1_ cross-published variant.
• Libraries that depend on JVM-specific APIs (reflection, java.io.File, java.net.Socket, threads, etc.) will not work.
• Pure Scala libraries and libraries published for Scala.js generally work.
• If unsure whether a library supports Scala.js, add it and run golem build to find out.

Steps

1. Add the dependency to build.sbt

   In the component’s build.sbt, add the library under libraryDependencies:

   libraryDependencies += "com.example" %%% "library-name" % "1.0.0"

   Use %%% (not %%) to get the Scala.js variant of the library.

2. Build to verify

   golem build

   Do NOT run sbt compile directly — always use golem build.

3. If the build fails

   • Check if the library publishes a Scala.js artifact. Look for _sjs1_ in the Maven/Sonatype listing.
   • Check for JVM-only dependencies in the transitive dependency tree.
   • Look for an alternative library that supports Scala.js.

Already available libraries

These are already in the project’s build.sbt — do NOT add them again:

• golem-scala-sdk — Golem agent framework, durability, transactions
• scala-js-dom — DOM API bindings (if present)

HTTP and networking

Use the Golem SDK’s HTTP client utilities. Standard JVM networking (java.net) is not available in Scala.js/WASM.