diff --git a/runtime/JavaScript/src/antlr4/BufferedTokenStream.d.ts b/runtime/JavaScript/src/antlr4/BufferedTokenStream.d.ts
index cf53eeee5d..d7f0ec6d0a 100644
--- a/runtime/JavaScript/src/antlr4/BufferedTokenStream.d.ts
+++ b/runtime/JavaScript/src/antlr4/BufferedTokenStream.d.ts
@@ -1,8 +1,27 @@
 import { TokenStream } from './TokenStream';
-import { Lexer } from "./Lexer";
+import { TokenSource } from './TokenSource';
+import { Token } from './Token';
 
 export declare class BufferedTokenStream extends TokenStream {
 
-    tokenSource: Lexer;
+    tokenSource: TokenSource;
+    tokens: Token[];
+    index: number;
+    fetchedEof: boolean;
 
+    constructor(source: TokenSource);
+    setTokenSource(tokenSource: TokenSource): void;
+    mark(): number;
+    release(marker: number): void;
+    reset(): void;
+    seek(index: number): void;
+    consume(): void;
+    sync(i: number): boolean;
+    fetch(n: number): number;
+    LB(k: number): Token;
+    nextTokenOnChannel(i: number, channel: number): number;
+    previousTokenOnChannel(i: number, channel: number): number;
+
+    protected lazyInit(): void;
+    protected adjustSeekIndex(i: number): number;
 }
diff --git a/runtime/JavaScript/src/antlr4/TokenSource.d.ts b/runtime/JavaScript/src/antlr4/TokenSource.d.ts
index 909aa68377..3186512adc 100644
--- a/runtime/JavaScript/src/antlr4/TokenSource.d.ts
+++ b/runtime/JavaScript/src/antlr4/TokenSource.d.ts
@@ -1,3 +1,7 @@
-export declare class TokenSource {
+import {Token} from "./Token";
 
+export declare class TokenSource {
+    _factory: any;
+    nextToken(): Token;
+    getSourceName(): string;
 }