fix(ts): fix of keywordS

chapi-ast-typescript/src/main/antlr/TypeScriptParser.g4

@@ -983,6 +983,7 @@ keyword
     | Namespace
     | Number
     | Boolean
+    | Of
     ;
 
 getter

chapi-ast-typescript/src/main/kotlin/chapi/ast/typescriptast/TypeScriptFullIdentListener.kt

@@ -589,7 +589,7 @@ class TypeScriptFullIdentListener(node: TSIdentify) : TypeScriptAstListener() {
     }
 
     private fun parseStatement(context: TypeScriptParser.SourceElementContext) {
-        val stmtChild = context.statement().getChild(0)
+        val stmtChild = context.statement()?.getChild(0) ?: return
         when (val childType = stmtChild::class.java.simpleName) {
             "ReturnStatementContext" -> {
                 val returnStmt = stmtChild as TypeScriptParser.ReturnStatementContext

chapi-ast-typescript/src/test/kotlin/chapi/ast/typescriptast/TypeScriptAnalyserTest.kt

@@ -1,10 +1,8 @@
 package chapi.ast.typescriptast
 
 import chapi.domain.core.DataStructType
-import org.junit.jupiter.api.Assertions.*
-import org.junit.jupiter.api.Disabled
+import org.junit.jupiter.api.Assertions.assertEquals
 import org.junit.jupiter.api.Test
-import java.io.File
 
 internal class TypeScriptAnalyserTest {
     @Test

chapi-ast-typescript/src/test/kotlin/chapi/ast/typescriptast/TypeScriptBugTest.kt

@@ -14,6 +14,15 @@ function test() {
     alert("test");
 }
 exports.test = test;
+"""
+
+        TypeScriptAnalyser().analysis(code, "index.tsx")
+    }
+
+    @Test
+    fun backend_arrow_function2() {
+        val code = """
+import {EMPTY, Observable, of} from 'rxjs';
 """
 
         TypeScriptAnalyser().analysis(code, "index.tsx")