diff --git a/org.lflang/src/org/lflang/generator/ts/TSActionGenerator.kt b/org.lflang/src/org/lflang/generator/ts/TSActionGenerator.kt
index d3bb1a2f0a..0fee968933 100644
--- a/org.lflang/src/org/lflang/generator/ts/TSActionGenerator.kt
+++ b/org.lflang/src/org/lflang/generator/ts/TSActionGenerator.kt
@@ -1,5 +1,6 @@
 package org.lflang.generator.ts
 
+import org.lflang.federated.FederateInstance
 import org.lflang.lf.Action
 import org.lflang.lf.Type
 import org.lflang.lf.Value
@@ -11,32 +12,12 @@ import java.util.*
 class TSActionGenerator (
     // TODO(hokeun): Remove dependency on TSGenerator.
     private val tsGenerator: TSGenerator,
-    private val actions: List<Action>
+    private val actions: List<Action>,
+    private val federate: FederateInstance
 ) {
     private fun Value.getTargetValue(): String = tsGenerator.getTargetValueW(this)
     private fun Type.getTargetType(): String = tsGenerator.getTargetTypeW(this)
 
-    /**
-     * Return a TS type for the specified action.
-     * If the type has not been specified, return
-     * "Present" which is the base type for Actions.
-     * @param action The action
-     * @return The TS type.
-     */
-    private fun getActionType(action: Action): String {
-        // Special handling for the networkMessage action created by
-        // FedASTUtils.makeCommunication(), by assigning TypeScript
-        // Buffer type for the action. Action<Buffer> is used as
-        // FederatePortAction in federation.ts.
-        if (action.name == "networkMessage") {
-            return "Buffer"
-        } else if (action.type != null) {
-            return action.type.getTargetType()
-        } else {
-            return "Present"
-        }
-    }
-
     fun generateClassProperties(): String {
         val stateClassProperties = LinkedList<String>()
         for (action in actions) {
@@ -45,7 +26,7 @@ class TSActionGenerator (
             // duplicate action if we included the one generated
             // by LF.
             if (action.name != "shutdown") {
-                stateClassProperties.add("${action.name}: __Action<${getActionType(action)}>;")
+                stateClassProperties.add("${action.name}: __Action<${getActionType(action, federate)}>;")
             }
         }
         return stateClassProperties.joinToString("\n")
@@ -70,7 +51,7 @@ class TSActionGenerator (
                     }
                 }
                 actionInstantiations.add(
-                    "this.${action.name} = new __Action<${getActionType(action)}>($actionArgs);")
+                    "this.${action.name} = new __Action<${getActionType(action, federate)}>($actionArgs);")
             }
         }
         return actionInstantiations.joinToString("\n")
diff --git a/org.lflang/src/org/lflang/generator/ts/TSExtensions.kt b/org.lflang/src/org/lflang/generator/ts/TSExtensions.kt
index 4ba4790fa5..f8ed80ae68 100644
--- a/org.lflang/src/org/lflang/generator/ts/TSExtensions.kt
+++ b/org.lflang/src/org/lflang/generator/ts/TSExtensions.kt
@@ -1,7 +1,9 @@
 package org.lflang.generator.ts
 
+import org.lflang.federated.FederateInstance
 import org.lflang.isBank
 import org.lflang.isMultiport
+import org.lflang.lf.Action
 import org.lflang.lf.Parameter
 import org.lflang.lf.Port
 import org.lflang.lf.Type
@@ -48,3 +50,24 @@ fun getPortType(port: Port): String {
 }
 
 fun Parameter.getTargetType(): String = TSTypes.getTargetType(this)
+
+/**
+ * Return a TS type for the specified action.
+ * If the type has not been specified, return
+ * "Present" which is the base type for Actions.
+ * @param action The action
+ * @return The TS type.
+ */
+fun getActionType(action: Action, federate: FederateInstance): String {
+    // Special handling for the networkMessage action created by
+    // FedASTUtils.makeCommunication(), by assigning TypeScript
+    // Buffer type for the action. Action<Buffer> is used as
+    // FederatePortAction in federation.ts.
+    if (action in federate.networkMessageActions) {
+        return "Buffer"
+    } else if (action.type != null) {
+        return action.type.getTargetType()
+    } else {
+        return "Present"
+    }
+}
diff --git a/org.lflang/src/org/lflang/generator/ts/TSReactionGenerator.kt b/org.lflang/src/org/lflang/generator/ts/TSReactionGenerator.kt
index daa7c0711f..7d4e420e69 100644
--- a/org.lflang/src/org/lflang/generator/ts/TSReactionGenerator.kt
+++ b/org.lflang/src/org/lflang/generator/ts/TSReactionGenerator.kt
@@ -41,21 +41,6 @@ class TSReactionGenerator(
         }
     }
 
-    /**
-     * Return a TS type for the specified action.
-     * If the type has not been specified, return
-     * "Present" which is the base type for Actions.
-     * @param action The action
-     * @return The TS type.
-     */
-    private fun getActionType(action: Action): String {
-        if (action.type != null) {
-            return action.type.getTargetType()
-        } else {
-            return "Present"
-        }
-    }
-
     /**
      * Return a TS type for the specified port.
      * If the type has not been specified, return
@@ -155,7 +140,7 @@ class TSReactionGenerator(
     }
 
     private fun generateReactionSignatureForTrigger(trigOrSource: VarRef): String {
-        var reactSignatureElementType = if (trigOrSource.variable.name == "networkMessage") {
+        var reactSignatureElementType = if (trigOrSource.variable.name.startsWith("networkMessage")) {
             // Special handling for the networkMessage action created by
             // FedASTUtils.makeCommunication(), by assigning TypeScript
             // Buffer type for the action. Action<Buffer> is used as
@@ -164,7 +149,7 @@ class TSReactionGenerator(
         } else if (trigOrSource.variable is Timer) {
             "__Tag"
         } else if (trigOrSource.variable is Action) {
-            getActionType(trigOrSource.variable as Action)
+            getActionType(trigOrSource.variable as Action, federate)
         } else if (trigOrSource.variable is Port) {
             getPortType(trigOrSource.variable as Port)
         } else {
@@ -348,7 +333,7 @@ class TSReactionGenerator(
             if (effect.variable is Timer) {
                 errorReporter.reportError("A timer cannot be an effect of a reaction")
             } else if (effect.variable is Action){
-                reactSignatureElement += ": Sched<" + getActionType(effect.variable as Action) + ">"
+                reactSignatureElement += ": Sched<" + getActionType(effect.variable as Action, federate) + ">"
                 schedActionSet.add(effect.variable as Action)
             } else if (effect.variable is Port){
                 reactSignatureElement += ": ${generateReactionSignatureElementForPortEffect(effect)}"
diff --git a/org.lflang/src/org/lflang/generator/ts/TSReactorGenerator.kt b/org.lflang/src/org/lflang/generator/ts/TSReactorGenerator.kt
index 6a4004e4ad..0b00f8c351 100644
--- a/org.lflang/src/org/lflang/generator/ts/TSReactorGenerator.kt
+++ b/org.lflang/src/org/lflang/generator/ts/TSReactorGenerator.kt
@@ -117,7 +117,7 @@ class TSReactorGenerator(
         val timerGenerator = TSTimerGenerator(tsGenerator, reactor.timers)
         val parameterGenerator = TSParameterGenerator(tsGenerator, reactor.parameters)
         val stateGenerator = TSStateGenerator(tsGenerator, reactor.stateVars)
-        val actionGenerator = TSActionGenerator(tsGenerator, reactor.actions)
+        val actionGenerator = TSActionGenerator(tsGenerator, reactor.actions, federate)
         val portGenerator = TSPortGenerator(reactor.inputs, reactor.outputs)
 
         val constructorGenerator = TSConstructorGenerator(tsGenerator, errorReporter, reactor, federate)