diff --git a/src/css/property-descriptors/background-clip.ts b/src/css/property-descriptors/background-clip.ts
index 022676d..fb04e80 100644
--- a/src/css/property-descriptors/background-clip.ts
+++ b/src/css/property-descriptors/background-clip.ts
@@ -1,7 +1,7 @@
 import {IPropertyListDescriptor, PropertyDescriptorParsingType} from '../IPropertyDescriptor';
 import {CSSValue, isIdentToken} from '../syntax/parser';
 import {Context} from '../../core/context';
-export enum BACKGROUND_CLIP {
+export const enum BACKGROUND_CLIP {
     BORDER_BOX = 0,
     PADDING_BOX = 1,
     CONTENT_BOX = 2
diff --git a/src/css/property-descriptors/background-repeat.ts b/src/css/property-descriptors/background-repeat.ts
index e02dcb1..f6ace6f 100644
--- a/src/css/property-descriptors/background-repeat.ts
+++ b/src/css/property-descriptors/background-repeat.ts
@@ -3,7 +3,7 @@ import {CSSValue, isIdentToken, parseFunctionArgs} from '../syntax/parser';
 import {Context} from '../../core/context';
 export type BackgroundRepeat = BACKGROUND_REPEAT[];
 
-export enum BACKGROUND_REPEAT {
+export const enum BACKGROUND_REPEAT {
     REPEAT = 0,
     NO_REPEAT = 1,
     REPEAT_X = 2,
diff --git a/src/css/property-descriptors/border-style.ts b/src/css/property-descriptors/border-style.ts
index 4302f66..8561b9a 100644
--- a/src/css/property-descriptors/border-style.ts
+++ b/src/css/property-descriptors/border-style.ts
@@ -1,6 +1,6 @@
 import {IPropertyIdentValueDescriptor, PropertyDescriptorParsingType} from '../IPropertyDescriptor';
 import {Context} from '../../core/context';
-export enum BORDER_STYLE {
+export const enum BORDER_STYLE {
     NONE = 0,
     SOLID = 1,
     DASHED = 2,
diff --git a/src/css/property-descriptors/float.ts b/src/css/property-descriptors/float.ts
index 134785e..2280cb8 100644
--- a/src/css/property-descriptors/float.ts
+++ b/src/css/property-descriptors/float.ts
@@ -1,6 +1,6 @@
 import {IPropertyIdentValueDescriptor, PropertyDescriptorParsingType} from '../IPropertyDescriptor';
 import {Context} from '../../core/context';
-export enum FLOAT {
+export const enum FLOAT {
     NONE = 0,
     LEFT = 1,
     RIGHT = 2,
diff --git a/src/css/property-descriptors/font-style.ts b/src/css/property-descriptors/font-style.ts
index 9a9c40e..09e221f 100644
--- a/src/css/property-descriptors/font-style.ts
+++ b/src/css/property-descriptors/font-style.ts
@@ -1,6 +1,6 @@
 import {IPropertyIdentValueDescriptor, PropertyDescriptorParsingType} from '../IPropertyDescriptor';
 import {Context} from '../../core/context';
-export enum FONT_STYLE {
+export const enum FONT_STYLE {
     NORMAL = 'normal',
     ITALIC = 'italic',
     OBLIQUE = 'oblique'
diff --git a/src/css/property-descriptors/list-style-position.ts b/src/css/property-descriptors/list-style-position.ts
index d4fbf74..ef308fd 100644
--- a/src/css/property-descriptors/list-style-position.ts
+++ b/src/css/property-descriptors/list-style-position.ts
@@ -1,6 +1,6 @@
 import {IPropertyIdentValueDescriptor, PropertyDescriptorParsingType} from '../IPropertyDescriptor';
 import {Context} from '../../core/context';
-export enum LIST_STYLE_POSITION {
+export const enum LIST_STYLE_POSITION {
     INSIDE = 0,
     OUTSIDE = 1
 }
diff --git a/src/css/property-descriptors/list-style-type.ts b/src/css/property-descriptors/list-style-type.ts
index 8655001..a808eef 100644
--- a/src/css/property-descriptors/list-style-type.ts
+++ b/src/css/property-descriptors/list-style-type.ts
@@ -1,6 +1,6 @@
 import {IPropertyIdentValueDescriptor, PropertyDescriptorParsingType} from '../IPropertyDescriptor';
 import {Context} from '../../core/context';
-export enum LIST_STYLE_TYPE {
+export const enum LIST_STYLE_TYPE {
     NONE = -1,
     DISC = 0,
     CIRCLE = 1,
diff --git a/src/css/property-descriptors/overflow.ts b/src/css/property-descriptors/overflow.ts
index ccb13a8..36d7f5c 100644
--- a/src/css/property-descriptors/overflow.ts
+++ b/src/css/property-descriptors/overflow.ts
@@ -1,7 +1,7 @@
 import {IPropertyListDescriptor, PropertyDescriptorParsingType} from '../IPropertyDescriptor';
 import {CSSValue, isIdentToken} from '../syntax/parser';
 import {Context} from '../../core/context';
-export enum OVERFLOW {
+export const enum OVERFLOW {
     VISIBLE = 0,
     HIDDEN = 1,
     SCROLL = 2,
diff --git a/src/css/property-descriptors/paint-order.ts b/src/css/property-descriptors/paint-order.ts
index 83fade4..44f025b 100644
--- a/src/css/property-descriptors/paint-order.ts
+++ b/src/css/property-descriptors/paint-order.ts
@@ -1,7 +1,7 @@
 import {IPropertyListDescriptor, PropertyDescriptorParsingType} from '../IPropertyDescriptor';
 import {CSSValue, isIdentToken} from '../syntax/parser';
 import {Context} from '../../core/context';
-export enum PAINT_ORDER_LAYER {
+export const enum PAINT_ORDER_LAYER {
     FILL,
     STROKE,
     MARKERS
diff --git a/src/css/property-descriptors/position.ts b/src/css/property-descriptors/position.ts
index 8ff8944..aeb07db 100644
--- a/src/css/property-descriptors/position.ts
+++ b/src/css/property-descriptors/position.ts
@@ -1,6 +1,6 @@
 import {IPropertyIdentValueDescriptor, PropertyDescriptorParsingType} from '../IPropertyDescriptor';
 import {Context} from '../../core/context';
-export enum POSITION {
+export const enum POSITION {
     STATIC = 0,
     RELATIVE = 1,
     ABSOLUTE = 2,
diff --git a/src/css/property-descriptors/text-align.ts b/src/css/property-descriptors/text-align.ts
index 6fb4d17..3cee2db 100644
--- a/src/css/property-descriptors/text-align.ts
+++ b/src/css/property-descriptors/text-align.ts
@@ -1,6 +1,6 @@
 import {IPropertyIdentValueDescriptor, PropertyDescriptorParsingType} from '../IPropertyDescriptor';
 import {Context} from '../../core/context';
-export enum TEXT_ALIGN {
+export const enum TEXT_ALIGN {
     LEFT = 0,
     CENTER = 1,
     RIGHT = 2
diff --git a/src/css/property-descriptors/text-transform.ts b/src/css/property-descriptors/text-transform.ts
index fd879be..110a258 100644
--- a/src/css/property-descriptors/text-transform.ts
+++ b/src/css/property-descriptors/text-transform.ts
@@ -1,6 +1,6 @@
 import {IPropertyIdentValueDescriptor, PropertyDescriptorParsingType} from '../IPropertyDescriptor';
 import {Context} from '../../core/context';
-export enum TEXT_TRANSFORM {
+export const enum TEXT_TRANSFORM {
     NONE = 0,
     LOWERCASE = 1,
     UPPERCASE = 2,
diff --git a/src/css/property-descriptors/visibility.ts b/src/css/property-descriptors/visibility.ts
index ede4df1..6fa3f8f 100644
--- a/src/css/property-descriptors/visibility.ts
+++ b/src/css/property-descriptors/visibility.ts
@@ -1,6 +1,6 @@
 import {IPropertyIdentValueDescriptor, PropertyDescriptorParsingType} from '../IPropertyDescriptor';
 import {Context} from '../../core/context';
-export enum VISIBILITY {
+export const enum VISIBILITY {
     VISIBLE = 0,
     HIDDEN = 1,
     COLLAPSE = 2
diff --git a/src/css/types/image.ts b/src/css/types/image.ts
index ffb3a7e..94ddf26 100644
--- a/src/css/types/image.ts
+++ b/src/css/types/image.ts
@@ -10,7 +10,7 @@ import {radialGradient} from './functions/radial-gradient';
 import {prefixRadialGradient} from './functions/-prefix-radial-gradient';
 import {Context} from '../../core/context';
 
-export enum CSSImageType {
+export const enum CSSImageType {
     URL,
     LINEAR_GRADIENT,
     RADIAL_GRADIENT
@@ -56,12 +56,12 @@ export interface CSSLinearGradientImage extends ICSSGradientImage {
     type: CSSImageType.LINEAR_GRADIENT;
 }
 
-export enum CSSRadialShape {
+export const enum CSSRadialShape {
     CIRCLE,
     ELLIPSE
 }
 
-export enum CSSRadialExtent {
+export const enum CSSRadialExtent {
     CLOSEST_SIDE,
     FARTHEST_SIDE,
     CLOSEST_CORNER,
diff --git a/src/render/path.ts b/src/render/path.ts
index 9174078..71d2c56 100644
--- a/src/render/path.ts
+++ b/src/render/path.ts
@@ -1,6 +1,6 @@
 import {BezierCurve} from './bezier-curve';
 import {Vector} from './vector';
-export enum PathType {
+export const enum PathType {
     VECTOR = 0,
     BEZIER_CURVE = 1
 }