[JS IR] Support additional repositories in CLI (compiler part)

js/js.frontend/src/org/jetbrains/kotlin/js/config/JSConfigurationKeys.java

@@ -12,6 +12,7 @@ import org.jetbrains.kotlin.incremental.js.IncrementalResultsConsumer;
 import org.jetbrains.kotlin.serialization.js.ModuleKind;
 
 import java.io.File;
+import java.util.Collection;
 import java.util.List;
 import java.util.Map;
 
@@ -89,4 +90,7 @@ public class JSConfigurationKeys {
 
     public static final CompilerConfigurationKey<ErrorTolerancePolicy> ERROR_TOLERANCE_POLICY =
             CompilerConfigurationKey.create("set up policy to ignore compilation errors");
+
+    public static final CompilerConfigurationKey<Collection<String>> REPOSITORIES =
+            CompilerConfigurationKey.create("set up additional repository paths");
 }