Try testing without a bundler, by setting NODE_PATH

.github/workflows/ci.yml

@@ -27,7 +27,7 @@ jobs:
           apps: mill
 
       - name: Test
-        run: mill --no-server --jobs 0 test
+        run: mill --no-server _.test
 
   publish:
     runs-on: ubuntu-latest

build.sc

@@ -47,17 +47,22 @@ trait CommonModule extends ScalaModule with CiReleaseModule with ScalafmtModule
   )
 }
 
-object jsdeps extends CommonModule
+object jsdeps extends CommonModule {
+  object test extends MillIntegrationTestModule {
+    override def millTestVersion = millVersion()
+    override def pluginsUnderTest = Seq(jsdeps)
+  }
+}
 
 //noinspection ScalaUnusedSymbol
 object millbundler extends CommonModule {
   override def moduleDeps = Seq(jsdeps)
   override def ivyDeps = Agg(
     ivy"com.lihaoyi::geny:1.0.0"
   )
-}
 
-object test extends MillIntegrationTestModule {
-  override def millTestVersion = millVersion()
-  override def pluginsUnderTest = Seq(millbundler)
+  object test extends MillIntegrationTestModule {
+    override def millTestVersion = millVersion()
+    override def pluginsUnderTest = Seq(millbundler)
+  }
 }

jsdeps/src/io/github/nafg/millbundler/jsdeps/ScalaJSNpmModule.scala

@@ -2,6 +2,8 @@ package io.github.nafg.millbundler.jsdeps
 
 import mill._
 import mill.modules.Jvm
+import mill.scalajslib.TestScalaJSModule
+import mill.scalajslib.api.JsEnvConfig
 
 //noinspection ScalaUnusedSymbol,ScalaWeakerAccess
 trait ScalaJSNpmModule extends ScalaJSDepsModule {
@@ -40,3 +42,16 @@ trait ScalaJSNpmModule extends ScalaJSDepsModule {
     PathRef(dir)
   }
 }
+//noinspection ScalaWeakerAccess
+object ScalaJSNpmModule {
+  trait Test extends TestScalaJSModule with ScalaJSNpmModule {
+    override def jsEnvConfig = T {
+      val path = npmInstall().path / "node_modules"
+      println("path: " + path)
+      os.proc("ls", "react-phone-number-input")
+        .call(cwd = path, stdout = os.Inherit)
+      JsEnvConfig.NodeJs(env = Map("NODE_PATH" -> path.toString))
+    }
+  }
+
+}

jsdeps/test/src/simple/build.sc

@@ -0,0 +1,34 @@
+import $exec.plugins
+
+import io.github.nafg.millbundler.jsdeps.ScalaJSNpmModule
+import mill.scalajslib.api.ModuleKind
+import mill.scalalib.{DepSyntax, TestModule}
+import mill.scalajslib.api.JsEnvConfig
+
+
+object main extends ScalaJSNpmModule {
+  override def scalaVersion = "2.13.10"
+  override def scalaJSVersion = "1.10.1"
+
+  override def ivyDeps =
+    Agg(
+      ivy"io.github.nafg.scalajs-facades::react-phone-number-input_3::0.16.0"
+    )
+
+  object test
+    extends Tests
+      with ScalaJSNpmModule.Test
+      with TestModule.Munit {
+
+    override def moduleKind = ModuleKind.CommonJSModule
+
+    override def ivyDeps =
+      super.ivyDeps() ++ Agg(ivy"org.scalameta::munit::0.7.29")
+  }
+}
+
+def verify = T {
+  val logger = T.ctx().log
+  val (_, testResults) = main.test.test()()
+  assert(testResults.nonEmpty, "No tests found")
+}

millbundler/test/src/webpack-simple/main/test/src/Tests.scala

@@ -0,0 +1,11 @@
+import io.github.nafg.scalajs.facades.reactphonenumberinput._
+import munit.Assertions._
+import scala.scalajs.js
+import scala.scalajs.js.annotation._
+
+
+class Tests extends munit.FunSuite {
+  test("ReactPhoneNumberInput") {
+    assert(!js.isUndefined(ReactPhoneNumberInput.raw))
+  }
+}