Cross-build tests

build.sbt

@@ -1,6 +1,7 @@
 val clueVersion            = "0.23.1"
 val lucumaCoreVersion2     = "0.45.0"
 val lucumaCoreVersion      = "0.58.0"
+val fs2Version             = "3.3.0"
 val munitVersion           = "0.7.29"
 val munitCatsEffectVersion = "1.0.7"
 val kittensVersion         = "3.0.0"
@@ -38,6 +39,7 @@ val lucumaSchemas =
         "edu.gemini"    %%% "clue-core"           % clueVersion,
         "edu.gemini"    %%% "lucuma-core"         % lucumaCoreVersion,
         "org.typelevel" %%% "kittens"             % kittensVersion,
+        "co.fs2"        %%% "fs2-io"              % fs2Version             % Test,
         "org.scalameta" %%% "munit"               % munitVersion           % Test,
         "org.typelevel" %%% "munit-cats-effect-3" % munitCatsEffectVersion % Test
       ),
@@ -57,3 +59,6 @@ val lucumaSchemas =
       // Include schema files from templates in jar.
       Compile / unmanagedResourceDirectories += (templates / Compile / resourceDirectory).value
     )
+    .jsSettings(
+      Test / scalaJSLinkerConfig ~= (_.withModuleKind(ModuleKind.CommonJSModule))
+    )

lucuma-schemas/src/test/scala/lucuma/schemas/decoders/InputStreamSuite.scala

@@ -4,6 +4,7 @@
 package lucuma.schemas.decoders
 
 import cats.effect._
+import fs2.io.file._
 import io.circe.Decoder
 import io.circe.Json
 import io.circe.parser._
@@ -14,22 +15,12 @@ import java.io.FileInputStream
 import java.nio.file.Paths
 
 trait InputStreamSuite extends CatsEffectSuite {
-  def inputStream(f: File): Resource[IO, FileInputStream] =
-    Resource.make {
-      IO.blocking(new FileInputStream(f)) // build
-    } { inStream =>
-      IO.blocking(inStream.close()).handleErrorWith(_ => IO.unit) // release
-    }
 
   def jsonResult(jsonFile: String): IO[Json] = {
-    val url  = getClass.getResource(jsonFile)
-    val file = Paths.get(url.toURI).toFile
-
-    inputStream(file).use { inStream =>
-      for {
-        str  <- IO.blocking(scala.io.Source.fromInputStream(inStream).mkString)
-        json <- IO.fromEither(parse(str))
-      } yield json
+    val path = Path(s"lucuma-schemas/src/test/resources") / jsonFile
+
+    Files[IO].readUtf8(path).compile.string.flatMap { str =>
+      IO.fromEither(parse(str))
     }
   }