diff --git a/packages/core/src/render3/i18n.ts b/packages/core/src/render3/i18n.ts
index 6244017d64..443041b5a7 100644
--- a/packages/core/src/render3/i18n.ts
+++ b/packages/core/src/render3/i18n.ts
@@ -1019,7 +1019,7 @@ function i18nAttributesFirstPass(lView: LView, tView: TView, index: number, valu
             elementAttributeInternal(previousElementIndex, attrName, value, lView);
           }
           // Check if that attribute is a directive input
-          const dataValue = tNode.inputs && tNode.inputs[attrName];
+          const dataValue = tNode.inputs !== null && tNode.inputs[attrName];
           if (dataValue) {
             setInputsForProperty(lView, dataValue, attrName, value);
             if (ngDevMode) {
diff --git a/packages/core/src/render3/instructions/listener.ts b/packages/core/src/render3/instructions/listener.ts
index c37d28492d..3425536647 100644
--- a/packages/core/src/render3/instructions/listener.ts
+++ b/packages/core/src/render3/instructions/listener.ts
@@ -192,7 +192,7 @@ function listenerInternal(
   // subscribe to directive outputs
   const outputs = tNode.outputs;
   let props: PropertyAliasValue|undefined;
-  if (processOutputs && outputs != null && (props = outputs[eventName])) {
+  if (processOutputs && outputs !== null && (props = outputs[eventName])) {
     const propsLength = props.length;
     if (propsLength) {
       const lCleanup = getCleanup(lView);
diff --git a/packages/core/src/render3/instructions/lview_debug.ts b/packages/core/src/render3/instructions/lview_debug.ts
index bbe621beda..6490db105e 100644
--- a/packages/core/src/render3/instructions/lview_debug.ts
+++ b/packages/core/src/render3/instructions/lview_debug.ts
@@ -167,8 +167,8 @@ export const TNodeConstructor = class TNode implements ITNode {
       public attrs: (string|AttributeMarker|(string|SelectorFlags)[])[]|null,  //
       public localNames: (string|number)[]|null,                               //
       public initialInputs: (string[]|null)[]|null|undefined,                  //
-      public inputs: PropertyAliases|null|undefined,                           //
-      public outputs: PropertyAliases|null|undefined,                          //
+      public inputs: PropertyAliases|null,                                     //
+      public outputs: PropertyAliases|null,                                    //
       public tViews: ITView|ITView[]|null,                                     //
       public next: ITNode|null,                                                //
       public projectionNext: ITNode|null,                                      //
diff --git a/packages/core/src/render3/instructions/shared.ts b/packages/core/src/render3/instructions/shared.ts
index bb3449f376..f2288a477f 100644
--- a/packages/core/src/render3/instructions/shared.ts
+++ b/packages/core/src/render3/instructions/shared.ts
@@ -801,8 +801,8 @@ export function createTNode(
                          attrs,  // attrs: (string|AttributeMarker|(string|SelectorFlags)[])[]|null
                          null,   // localNames: (string|number)[]|null
                          undefined,  // initialInputs: (string[]|null)[]|null|undefined
-                         undefined,  // inputs: PropertyAliases|null|undefined
-                         undefined,  // outputs: PropertyAliases|null|undefined
+                         null,       // inputs: PropertyAliases|null
+                         null,       // outputs: PropertyAliases|null
                          null,       // tViews: ITView|ITView[]|null
                          null,       // next: ITNode|null
                          null,       // projectionNext: ITNode|null
@@ -825,8 +825,8 @@ export function createTNode(
                        attrs: attrs,
                        localNames: null,
                        initialInputs: undefined,
-                       inputs: undefined,
-                       outputs: undefined,
+                       inputs: null,
+                       outputs: null,
                        tViews: null,
                        next: null,
                        projectionNext: null,
diff --git a/packages/core/src/render3/interfaces/node.ts b/packages/core/src/render3/interfaces/node.ts
index 66b2684939..bf52d5a1ec 100644
--- a/packages/core/src/render3/interfaces/node.ts
+++ b/packages/core/src/render3/interfaces/node.ts
@@ -448,20 +448,16 @@ export interface TNode {
   initialInputs: InitialInputData|null|undefined;
 
   /**
-   * Input data for all directives on this node.
-   *
-   * - `undefined` means that the prop has not been initialized yet,
-   * - `null` means that the prop has been initialized but no inputs have been found.
+   * Input data for all directives on this node. `null` means that there are no directives with
+   * inputs on this node.
    */
-  inputs: PropertyAliases|null|undefined;
+  inputs: PropertyAliases|null;
 
   /**
-   * Output data for all directives on this node.
-   *
-   * - `undefined` means that the prop has not been initialized yet,
-   * - `null` means that the prop has been initialized but no outputs have been found.
+   * Output data for all directives on this node. `null` means that there are no directives with
+   * outputs on this node.
    */
-  outputs: PropertyAliases|null|undefined;
+  outputs: PropertyAliases|null;
 
   /**
    * The TView or TViews attached to this node.