diff --git a/src/render-utils.ts b/src/render-utils.ts
index cf91361..d93f587 100644
--- a/src/render-utils.ts
+++ b/src/render-utils.ts
@@ -4,14 +4,22 @@ import { unifyPath, hashCode } from './utils';
 import * as rematch from './rematch';
 import { LineMatchingType, DiffStyleType, LineType, DiffLineParts, DiffFile, DiffFileName } from './types';
 
-export enum CSSLineClass {
-  INSERTS = 'd2h-ins',
-  DELETES = 'd2h-del',
-  CONTEXT = 'd2h-cntx',
-  INFO = 'd2h-info',
-  INSERT_CHANGES = 'd2h-ins d2h-change',
-  DELETE_CHANGES = 'd2h-del d2h-change',
-}
+export type CSSLineClass =
+  | 'd2h-ins'
+  | 'd2h-del'
+  | 'd2h-cntx'
+  | 'd2h-info'
+  | 'd2h-ins d2h-change'
+  | 'd2h-del d2h-change';
+
+export const CSSLineClass: { [_: string]: CSSLineClass } = {
+  INSERTS: 'd2h-ins',
+  DELETES: 'd2h-del',
+  CONTEXT: 'd2h-cntx',
+  INFO: 'd2h-info',
+  INSERT_CHANGES: 'd2h-ins d2h-change',
+  DELETE_CHANGES: 'd2h-del d2h-change',
+};
 
 export type HighlightedLines = {
   oldLine: {
diff --git a/src/types.ts b/src/types.ts
index a7515f7..d573ac9 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -69,18 +69,24 @@ export interface DiffFile extends DiffFileName {
   mode?: string;
 }
 
-export enum OutputFormatType {
-  LINE_BY_LINE = 'line-by-line',
-  SIDE_BY_SIDE = 'side-by-side',
-}
+export type OutputFormatType = 'line-by-line' | 'side-by-side';
 
-export enum LineMatchingType {
-  LINES = 'lines',
-  WORDS = 'words',
-  NONE = 'none',
-}
+export const OutputFormatType: { [_: string]: OutputFormatType } = {
+  LINE_BY_LINE: 'line-by-line',
+  SIDE_BY_SIDE: 'side-by-side',
+};
 
-export enum DiffStyleType {
-  WORD = 'word',
-  CHAR = 'char',
-}
+export type LineMatchingType = 'lines' | 'words' | 'none';
+
+export const LineMatchingType: { [_: string]: LineMatchingType } = {
+  LINES: 'lines',
+  WORDS: 'words',
+  NONE: 'none',
+};
+
+export type DiffStyleType = 'word' | 'char';
+
+export const DiffStyleType: { [_: string]: DiffStyleType } = {
+  WORD: 'word',
+  CHAR: 'char',
+};