From 68550a011a2dcd3c236fc602f19b20ff7345f7a9 Mon Sep 17 00:00:00 2001
From: Wojciech Mazur <wmazur@virtuslab.com>
Date: Mon, 24 Nov 2025 21:12:59 +0100
Subject: [PATCH] [build] Add missing mapSourceURI for `scala-library-sjs`
 project (#24450)

`-scalajs-mapSourceURI` was missing, it's required to emit correct debug
informaiton in Scala.js debuggers
[Cherry-picked 01e92e03dcf961ce408bf1e84e3057a9d3527298][modified]
---
 project/Build.scala | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/project/Build.scala b/project/Build.scala
index b820e904bf69..b36c62c00703 100644
--- a/project/Build.scala
+++ b/project/Build.scala
@@ -2192,6 +2192,16 @@ object Build {
       Compile / scalacOptions += "-Yno-stdlib-patches",
       Compile / scalacOptions += "-Yexplicit-nulls",
       Compile / scalacOptions += "-scalajs",
+      // Configure the source maps to point to GitHub for releases
+      Compile / scalacOptions ++= {
+        if (isRelease) {
+          val baseURI = (LocalRootProject / baseDirectory).value.toURI
+          val dottyVersion = version.value
+          Seq(s"-scalajs-mapSourceURI:$baseURI->$dottyGithubRawUserContentUrl/$dottyVersion/")
+        } else {
+          Nil
+        }
+      },
       // Packaging configuration of the stdlib
       Compile / packageBin / publishArtifact := true,
       Compile / packageDoc / publishArtifact := true,