diff --git a/types/jss/index.d.ts b/types/jss/index.d.ts
index edcb0ba95f..5326e3f6d7 100644
--- a/types/jss/index.d.ts
+++ b/types/jss/index.d.ts
@@ -104,7 +104,7 @@ export interface RuleOptions {
 	index: number;
 	className: string;
 }
-export declare class SheetsRegistry {
+export class SheetsRegistry {
 	constructor();
 	registry: ReadonlyArray<StyleSheet>;
 	readonly index: number;
@@ -122,7 +122,7 @@ export type CreateStyleSheetOptions<Name extends string = any> = Partial<{
 	generateClassName: GenerateClassName<Name>;
 	classNamePrefix: string;
 }>;
-export declare class JSS {
+export class JSS {
 	constructor(options?: Partial<JSSOptions>);
 	createStyleSheet<Name extends string>(
 		styles: Partial<Styles<Name>>,
diff --git a/types/node-xlsx/index.d.ts b/types/node-xlsx/index.d.ts
index bd500d8a4e..4b9432da76 100644
--- a/types/node-xlsx/index.d.ts
+++ b/types/node-xlsx/index.d.ts
@@ -10,7 +10,7 @@
  * @param options options is for xlsx
  * @returns worksheets data, like: { name: 'worksheets', data: [[1,2,3],['1', '2','word']] }
  */
-export declare function parse(
+export function parse(
     mixed: string | ArrayBuffer,
     options?: {}
 ): Array<{
@@ -24,7 +24,7 @@ export declare function parse(
  * @param options spannig multiple rows A1:A4
  * @returns returns a buffer of worksheets
  */
-export declare function build(
+export function build(
     worksheets: Array<{ name: string; data: any[][] }>,
     options?: {}
 ): ArrayBuffer;
diff --git a/types/react-native-fetch-blob/index.d.ts b/types/react-native-fetch-blob/index.d.ts
index 910fa4dba9..38b59bee28 100644
--- a/types/react-native-fetch-blob/index.d.ts
+++ b/types/react-native-fetch-blob/index.d.ts
@@ -33,11 +33,11 @@ export interface Polyfill {
     Fetch: PolyfillFetch;
 }
 
-export declare class PolyfillFetch extends RNFetchBlobFetchPolyfill {
+export class PolyfillFetch extends RNFetchBlobFetchPolyfill {
     constructor(config: RNFetchBlobConfig);
 }
 
-export declare class RNFetchBlobFetchPolyfill {
+export class RNFetchBlobFetchPolyfill {
     constructor(config: RNFetchBlobConfig);
 
     build(): (url: string, options: RNFetchBlobConfig) => StatefulPromise<RNFetchBlobFetchRepsonse>;
@@ -129,13 +129,13 @@ export interface PolyfillFileReader extends EventTarget {
     result: number;
 }
 
-export declare namespace PolyfillFileReader {
+export namespace PolyfillFileReader {
     const EMPTY: number;
     const LOADING: number;
     const DONE: number;
 }
 
-export declare class PolyfillEvent {
+export class PolyfillEvent {
 }
 
 export interface PolyfillProgressEvent extends EventTarget {
@@ -144,7 +144,7 @@ export interface PolyfillProgressEvent extends EventTarget {
     total: number;
 }
 
-export declare class PolyfillBlob extends EventTarget {
+export class PolyfillBlob extends EventTarget {
     /**
      * RNFetchBlob Blob polyfill, create a Blob directly from file path, BASE64
      * encoded data, and string. The conversion is done implicitly according to
@@ -194,7 +194,7 @@ export declare class PolyfillBlob extends EventTarget {
     close(): Promise<void>;
 }
 
-export declare namespace PolyfillBlob {
+export namespace PolyfillBlob {
     function clearCache(): void;
 
     function build(data: any, cType: any): Promise<PolyfillBlob>;
@@ -202,7 +202,7 @@ export declare namespace PolyfillBlob {
     function setLog(level: number): void;
 }
 
-export declare class PolyfillFile extends PolyfillBlob {
+export class PolyfillFile extends PolyfillBlob {
 }
 
 export interface PolyfillXMLHttpRequest extends PolyfillXMLHttpRequestEventTarget {
@@ -252,7 +252,7 @@ export interface PolyfillXMLHttpRequest extends PolyfillXMLHttpRequestEventTarge
     responseType: string;
 }
 
-export declare namespace PolyfillXMLHttpRequest {
+export namespace PolyfillXMLHttpRequest {
     const binaryContentTypes: string[];
     const UNSENT: number;
     const OPENED: number;
@@ -490,7 +490,7 @@ export interface StatefulPromise<T> extends Promise<T> {
     expire(callback: () => void): StatefulPromise<void>;
 }
 
-export declare class RNFetchBlobSession {
+export class RNFetchBlobSession {
     constructor(name: string, list: string[]);
 
     add(path: string): RNFetchBlobSession;
@@ -609,10 +609,10 @@ export interface RNFetchBlobStream {
     onEnd(): void;
 }
 
-export declare class RNFetchBlobFile {
+export class RNFetchBlobFile {
 }
 
-export declare class RNFetchBlobStat {
+export class RNFetchBlobStat {
     lastModified: string;
     size: string;
     type: "directory" | "file";
diff --git a/types/readable-stream/package.json b/types/readable-stream/package.json
new file mode 100644
index 0000000000..6eaa7476e4
--- /dev/null
+++ b/types/readable-stream/package.json
@@ -0,0 +1,6 @@
+{
+    "private": true,
+    "dependencies": {
+        "safe-buffer": "*"
+    }
+}
diff --git a/types/rn-fetch-blob/index.d.ts b/types/rn-fetch-blob/index.d.ts
index 79758b4511..2ff48bc108 100644
--- a/types/rn-fetch-blob/index.d.ts
+++ b/types/rn-fetch-blob/index.d.ts
@@ -33,11 +33,11 @@ export interface Polyfill {
     Fetch: PolyfillFetch;
 }
 
-export declare class PolyfillFetch extends RNFetchBlobFetchPolyfill {
+export class PolyfillFetch extends RNFetchBlobFetchPolyfill {
     constructor(config: RNFetchBlobConfig);
 }
 
-export declare class RNFetchBlobFetchPolyfill {
+export class RNFetchBlobFetchPolyfill {
     constructor(config: RNFetchBlobConfig);
 
     build(): (url: string, options: RNFetchBlobConfig) => StatefulPromise<RNFetchBlobFetchRepsonse>;
@@ -129,13 +129,13 @@ export interface PolyfillFileReader extends EventTarget {
     result: number;
 }
 
-export declare namespace PolyfillFileReader {
+export namespace PolyfillFileReader {
     const EMPTY: number;
     const LOADING: number;
     const DONE: number;
 }
 
-export declare class PolyfillEvent {
+export class PolyfillEvent {
 }
 
 export interface PolyfillProgressEvent extends EventTarget {
@@ -144,7 +144,7 @@ export interface PolyfillProgressEvent extends EventTarget {
     total: number;
 }
 
-export declare class PolyfillBlob extends EventTarget {
+export class PolyfillBlob extends EventTarget {
     /**
      * RNFetchBlob Blob polyfill, create a Blob directly from file path, BASE64
      * encoded data, and string. The conversion is done implicitly according to
@@ -194,7 +194,7 @@ export declare class PolyfillBlob extends EventTarget {
     close(): Promise<void>;
 }
 
-export declare namespace PolyfillBlob {
+export namespace PolyfillBlob {
     function clearCache(): void;
 
     function build(data: any, cType: any): Promise<PolyfillBlob>;
@@ -202,7 +202,7 @@ export declare namespace PolyfillBlob {
     function setLog(level: number): void;
 }
 
-export declare class PolyfillFile extends PolyfillBlob {
+export class PolyfillFile extends PolyfillBlob {
 }
 
 export interface PolyfillXMLHttpRequest extends PolyfillXMLHttpRequestEventTarget {
@@ -252,7 +252,7 @@ export interface PolyfillXMLHttpRequest extends PolyfillXMLHttpRequestEventTarge
     responseType: string;
 }
 
-export declare namespace PolyfillXMLHttpRequest {
+export namespace PolyfillXMLHttpRequest {
     const binaryContentTypes: string[];
     const UNSENT: number;
     const OPENED: number;
@@ -490,7 +490,7 @@ export interface StatefulPromise<T> extends Promise<T> {
     expire(callback: () => void): StatefulPromise<void>;
 }
 
-export declare class RNFetchBlobSession {
+export class RNFetchBlobSession {
     constructor(name: string, list: string[]);
 
     add(path: string): RNFetchBlobSession;
@@ -609,10 +609,10 @@ export interface RNFetchBlobStream {
     onEnd(): void;
 }
 
-export declare class RNFetchBlobFile {
+export class RNFetchBlobFile {
 }
 
-export declare class RNFetchBlobStat {
+export class RNFetchBlobStat {
     lastModified: string;
     size: string;
     type: "directory" | "file";
diff --git a/types/words-to-numbers/index.d.ts b/types/words-to-numbers/index.d.ts
index 97ab92be8b..bbb0eb4ed9 100644
--- a/types/words-to-numbers/index.d.ts
+++ b/types/words-to-numbers/index.d.ts
@@ -3,5 +3,5 @@
 // Definitions by: James Frowen <https://github.com/James-Frowen>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
-export declare function wordsToNumbers(text: string, options?: { fuzzy: boolean }): string | number | null;
+export function wordsToNumbers(text: string, options?: { fuzzy: boolean }): string | number | null;
 export default wordsToNumbers;