diff --git a/packages/mindplot/src/components/DesignerKeyboard.ts b/packages/mindplot/src/components/DesignerKeyboard.ts
index db7f73c4..0d146ef8 100644
--- a/packages/mindplot/src/components/DesignerKeyboard.ts
+++ b/packages/mindplot/src/components/DesignerKeyboard.ts
@@ -280,7 +280,6 @@ class DesignerKeyboard extends Keyboard {
         const nodes = designer.getModel().filterSelectedTopics();
         if (nodes.length > 0) {
           // If a modifier is press, the key selected must be ignored.
-          const pressKey = String.fromCharCode(keyCode);
           if (event.ctrlKey || event.altKey || event.metaKey) {
             return;
           }
@@ -363,7 +362,7 @@ class DesignerKeyboard extends Keyboard {
     }
   }
 
-  private _goToChild(designer, node) {
+  private _goToChild(designer: Designer, node: Topic) {
     const children = node.getChildren();
     if (children.length > 0) {
       let target = children[0];
diff --git a/packages/mindplot/src/components/StandaloneActionDispatcher.ts b/packages/mindplot/src/components/StandaloneActionDispatcher.ts
index 8fe87598..6d8c8f2e 100644
--- a/packages/mindplot/src/components/StandaloneActionDispatcher.ts
+++ b/packages/mindplot/src/components/StandaloneActionDispatcher.ts
@@ -114,7 +114,7 @@ class StandaloneActionDispatcher extends ActionDispatcher {
   changeTextToTopic(topicsIds: number[], text: string) {
     $assert($defined(topicsIds), 'topicsIds can not be null');
 
-    const commandFunc = (topic: Topic, value: object) => {
+    const commandFunc = (topic: Topic, value: string) => {
       const result = topic.getText();
       topic.setText(value);
       return result;
diff --git a/packages/mindplot/src/components/Topic.ts b/packages/mindplot/src/components/Topic.ts
index 0f457fc9..b36351a8 100644
--- a/packages/mindplot/src/components/Topic.ts
+++ b/packages/mindplot/src/components/Topic.ts
@@ -530,7 +530,7 @@ abstract class Topic extends NodeGraph {
     }
   }
 
-  _setText(text, updateModel) {
+  _setText(text: string, updateModel: boolean) {
     const textShape = this.getTextShape();
     textShape.setText(text == null ? TopicStyle.defaultText(this) : text);
 
@@ -541,7 +541,7 @@ abstract class Topic extends NodeGraph {
   }
 
   /** */
-  setText(text) {
+  setText(text: string) {
     // Avoid empty nodes ...
     if (!text || $.trim(text).length === 0) {
       this._setText(null, true);
@@ -553,7 +553,7 @@ abstract class Topic extends NodeGraph {
   }
 
   /** */
-  getText() {
+  getText(): string {
     const model = this.getModel();
     let result = model.getText();
     if (!$defined(result)) {
@@ -563,11 +563,11 @@ abstract class Topic extends NodeGraph {
   }
 
   /** */
-  setBackgroundColor(color) {
+  setBackgroundColor(color: string) {
     this._setBackgroundColor(color, true);
   }
 
-  _setBackgroundColor(color, updateModel) {
+  _setBackgroundColor(color: string, updateModel: boolean) {
     const innerShape = this.getInnerShape();
     innerShape.setFill(color);
 
@@ -583,7 +583,7 @@ abstract class Topic extends NodeGraph {
   }
 
   /** */
-  getBackgroundColor() {
+  getBackgroundColor(): string {
     const model = this.getModel();
     let result = model.getBackgroundColor();
     if (!$defined(result)) {
@@ -593,11 +593,11 @@ abstract class Topic extends NodeGraph {
   }
 
   /** */
-  setBorderColor(color) {
+  setBorderColor(color: string) {
     this._setBorderColor(color, true);
   }
 
-  _setBorderColor(color, updateModel) {
+  _setBorderColor(color: string, updateModel: boolean) {
     const innerShape = this.getInnerShape();
     innerShape.setAttribute('strokeColor', color);
 
@@ -1349,7 +1349,7 @@ abstract class Topic extends NodeGraph {
     return result;
   }
 
-  isCentralTopic() {
+  isCentralTopic(): boolean {
     return this.getModel().getType() === 'CentralTopic';
   }
 }