diff --git a/src/main/java/com/caoccao/javet/swc4j/ast/interfaces/ISwc4jAst.java b/src/main/java/com/caoccao/javet/swc4j/ast/interfaces/ISwc4jAst.java
index 1533a95..9dfa4ea 100644
--- a/src/main/java/com/caoccao/javet/swc4j/ast/interfaces/ISwc4jAst.java
+++ b/src/main/java/com/caoccao/javet/swc4j/ast/interfaces/ISwc4jAst.java
@@ -64,7 +64,7 @@ default Optional<ISwc4jAst> eval() {
      * @return the list of AST nodes
      * @since 1.3.0
      */
-    default <T extends ISwc4jAst> List<ISwc4jAst> find(Class<T> clazz) {
+    default <T extends ISwc4jAst> List<T> find(Class<T> clazz) {
         return find(clazz, -1);
     }
 
@@ -77,12 +77,13 @@ default <T extends ISwc4jAst> List<ISwc4jAst> find(Class<T> clazz) {
      * @return the list of AST nodes
      * @since 1.3.0
      */
-    default <T extends ISwc4jAst> List<ISwc4jAst> find(Class<T> clazz, int depth) {
+    @SuppressWarnings("unchecked")
+    default <T extends ISwc4jAst> List<T> find(Class<T> clazz, int depth) {
         AssertionUtils.notNull(clazz, "Class");
-        List<ISwc4jAst> nodes = SimpleList.of();
+        List<T> nodes = SimpleList.of();
         getChildNodes().forEach((childNode) -> {
             if (clazz.isAssignableFrom(childNode.getClass())) {
-                nodes.add(childNode);
+                nodes.add((T) childNode);
             }
             if (depth != 0) {
                 final int newDepth = depth > 0 ? depth - 1 : depth;
diff --git a/src/test/java/com/caoccao/javet/swc4j/ast/expr/TestSwc4jAstBinExpr.java b/src/test/java/com/caoccao/javet/swc4j/ast/expr/TestSwc4jAstBinExpr.java
index f14f1bc..c08bd73 100644
--- a/src/test/java/com/caoccao/javet/swc4j/ast/expr/TestSwc4jAstBinExpr.java
+++ b/src/test/java/com/caoccao/javet/swc4j/ast/expr/TestSwc4jAstBinExpr.java
@@ -19,7 +19,6 @@
 import com.caoccao.javet.swc4j.ast.BaseTestSuiteSwc4jAst;
 import com.caoccao.javet.swc4j.ast.enums.Swc4jAstBinaryOp;
 import com.caoccao.javet.swc4j.ast.enums.Swc4jAstType;
-import com.caoccao.javet.swc4j.ast.interfaces.ISwc4jAst;
 import com.caoccao.javet.swc4j.ast.program.Swc4jAstScript;
 import com.caoccao.javet.swc4j.ast.stmt.Swc4jAstExprStmt;
 import com.caoccao.javet.swc4j.ast.visitors.Swc4jAstVisitor;
@@ -91,9 +90,9 @@ public void testGetBangCount() throws Swc4jCoreException {
             String code = entry.getKey();
             int bangCount = entry.getValue();
             Swc4jParseOutput output = swc4j.parse(code, tsScriptParseOptions);
-            List<ISwc4jAst> nodes = output.getProgram().find(Swc4jAstBinExpr.class);
+            List<Swc4jAstBinExpr> nodes = output.getProgram().find(Swc4jAstBinExpr.class);
             assertEquals(1, nodes.size());
-            Swc4jAstBinExpr binExpr = nodes.get(0).as(Swc4jAstBinExpr.class);
+            Swc4jAstBinExpr binExpr = nodes.get(0);
             assertEquals("a", binExpr.getLeft().as(Swc4jAstIdent.class).getSym());
             assertEquals("b", binExpr.getRight().as(Swc4jAstIdent.class).getSym());
             assertEquals(bangCount, binExpr.getBangCount());
diff --git a/src/test/java/com/caoccao/javet/swc4j/ast/expr/lit/TestSwc4jAstNumber.java b/src/test/java/com/caoccao/javet/swc4j/ast/expr/lit/TestSwc4jAstNumber.java
index 55a18cd..b334ab6 100644
--- a/src/test/java/com/caoccao/javet/swc4j/ast/expr/lit/TestSwc4jAstNumber.java
+++ b/src/test/java/com/caoccao/javet/swc4j/ast/expr/lit/TestSwc4jAstNumber.java
@@ -18,7 +18,6 @@
 
 import com.caoccao.javet.swc4j.ast.BaseTestSuiteSwc4jAst;
 import com.caoccao.javet.swc4j.ast.enums.Swc4jAstType;
-import com.caoccao.javet.swc4j.ast.interfaces.ISwc4jAst;
 import com.caoccao.javet.swc4j.ast.program.Swc4jAstScript;
 import com.caoccao.javet.swc4j.ast.stmt.Swc4jAstExprStmt;
 import com.caoccao.javet.swc4j.exceptions.Swc4jCoreException;
@@ -88,9 +87,9 @@ public void testGetMinusCount() throws Swc4jCoreException {
             String code = entry.getKey();
             int minusCount = entry.getValue();
             Swc4jParseOutput output = swc4j.parse(code, tsScriptParseOptions);
-            List<ISwc4jAst> nodes = output.getProgram().find(Swc4jAstNumber.class);
+            List<Swc4jAstNumber> nodes = output.getProgram().find(Swc4jAstNumber.class);
             assertEquals(1, nodes.size());
-            Swc4jAstNumber number = nodes.get(0).as(Swc4jAstNumber.class);
+            Swc4jAstNumber number = nodes.get(0);
             assertEquals(12345, number.asInt());
             assertEquals("12345", number.getRaw().get());
             assertEquals(minusCount, number.getMinusCount());