diff --git a/scripts/build.sh b/scripts/build.sh
index dfadd89..1e9e1f7 100644
--- a/scripts/build.sh
+++ b/scripts/build.sh
@@ -9,7 +9,7 @@ DIST_DIR="dist"
 TYPES_DIR="${DIST_DIR}/types"
 
 # build types
-npx tsc -p tsconfig.build.json || exit 1
+npx tsc -p tsconfig.build.json
 
 # Delete unnecessary files (other than those related to index.d.ts)
 find ${DIST_DIR} -mindepth 1 ! -name 'index.d.ts' ! -name 'index.d.ts.map' -exec rm -rf {} +
@@ -20,7 +20,7 @@ mv ${DIST_DIR}/index.d.ts ${TYPES_DIR}/
 mv ${DIST_DIR}/index.d.ts.map ${TYPES_DIR}/
 
 # build
-pkgroll --tsconfig=tsconfig.build.json || exit 1
+pkgroll --tsconfig=tsconfig.build.json
 
 # restore type definition files
 mv ${TYPES_DIR}/index.d.ts ${DIST_DIR}/
diff --git a/src/types/symbolFlags.ts b/src/constants/tsInternalFlags.ts
similarity index 63%
rename from src/types/symbolFlags.ts
rename to src/constants/tsInternalFlags.ts
index b2471e7..e3c22a9 100644
--- a/src/types/symbolFlags.ts
+++ b/src/constants/tsInternalFlags.ts
@@ -1,14 +1,14 @@
 /**
  * Implementing `SymbolFlags` defined in typescript on your own, in order not to include TypeScript in dependencies
  */
-export enum SymbolFlags {
-  Class = 32,
-}
+export const SYMBOL_FLAGS = {
+  CLASS: 32,
+} as const;
 
 /**
  * Implementing `SyntaxKind` defined in typescript on your own, in order not to include TypeScript in dependencies
  */
-export enum SyntaxKind {
-  ClassDeclaration = 263,
-  Constructor = 176,
-}
+export const SYNTAX_KIND = {
+  CLASS_DECLARATION: 263,
+  CONSTRUCTOR: 176,
+} as const;
diff --git a/src/rules/no-class-in-interface.ts b/src/rules/no-class-in-interface.ts
index d1f39fb..b0d0e1c 100644
--- a/src/rules/no-class-in-interface.ts
+++ b/src/rules/no-class-in-interface.ts
@@ -1,6 +1,6 @@
 import { AST_NODE_TYPES, ESLintUtils } from "@typescript-eslint/utils";
 
-import { SymbolFlags } from "../types/symbolFlags";
+import { SYMBOL_FLAGS } from "../constants/tsInternalFlags";
 
 /**
  * Enforces the use of interface types instead of class in interface properties
@@ -38,7 +38,7 @@ export const noClassInInterface = ESLintUtils.RuleCreator.withoutDocs({
           if (!type.symbol) continue;
 
           // NOTE: check class type
-          const isClass = type.symbol.flags === SymbolFlags.Class;
+          const isClass = type.symbol.flags === SYMBOL_FLAGS.CLASS;
           if (!isClass) continue;
 
           context.report({
diff --git a/src/rules/no-public-class-fields.ts b/src/rules/no-public-class-fields.ts
index 7c7616a..efb5416 100644
--- a/src/rules/no-public-class-fields.ts
+++ b/src/rules/no-public-class-fields.ts
@@ -6,7 +6,7 @@ import {
   TSESTree,
 } from "@typescript-eslint/utils";
 
-import { SymbolFlags } from "../types/symbolFlags";
+import { SYMBOL_FLAGS } from "../constants/tsInternalFlags";
 import { isConstructOrStackType } from "../utils/typeCheck";
 
 type Context = TSESLint.RuleContext<"noPublicClassFields", []>;
@@ -91,7 +91,7 @@ const validateClassMember = (
     const type = parserServices.getTypeAtLocation(member);
     if (!type.symbol) continue;
 
-    const isClass = type.symbol.flags === SymbolFlags.Class;
+    const isClass = type.symbol.flags === SYMBOL_FLAGS.CLASS;
     if (!isClass) continue;
 
     context.report({
@@ -133,7 +133,7 @@ const validateConstructorParameterProperty = (
     const type = parserServices.getTypeAtLocation(param);
     if (!type.symbol) continue;
 
-    const isClass = type.symbol.flags === SymbolFlags.Class;
+    const isClass = type.symbol.flags === SYMBOL_FLAGS.CLASS;
     if (!isClass) continue;
 
     context.report({
diff --git a/src/utils/parseType.ts b/src/utils/parseType.ts
index 35178cb..fa084ad 100644
--- a/src/utils/parseType.ts
+++ b/src/utils/parseType.ts
@@ -6,7 +6,7 @@ import {
   Type,
 } from "typescript";
 
-import { SyntaxKind } from "../types/symbolFlags";
+import { SYNTAX_KIND } from "../constants/tsInternalFlags";
 
 /**
  * Parses type to get the property names of the class constructor.
@@ -33,7 +33,7 @@ export const getConstructorPropertyNames = (type: Type): string[] => {
 const isClassDeclaration = (
   declaration: Declaration
 ): declaration is ClassDeclaration => {
-  return declaration.kind === SyntaxKind.ClassDeclaration;
+  return declaration.kind === SYNTAX_KIND.CLASS_DECLARATION;
 };
 
 /**
@@ -42,5 +42,5 @@ const isClassDeclaration = (
 const isConstructorDeclaration = (
   node: Node
 ): node is ConstructorDeclaration => {
-  return node.kind === SyntaxKind.Constructor;
+  return node.kind === SYNTAX_KIND.CONSTRUCTOR;
 };