diff --git a/blakejs/blakejs-tests.ts b/blakejs/blakejs-tests.ts
index 493cb20..2dec460 100644
--- a/blakejs/blakejs-tests.ts
+++ b/blakejs/blakejs-tests.ts
@@ -1,4 +1,4 @@
-import blake = require('blakejs');
+import blake from 'blakejs';
 
 blake.blake2bHex(new Uint8Array([1, 2, 3, 4, 5]));
 blake.blake2sHex(Buffer.from([1, 2, 3, 4, 5]));
diff --git a/blakejs/index.d.ts b/blakejs/index.d.ts
index b3cd7d0..e0bf7bd 100644
--- a/blakejs/index.d.ts
+++ b/blakejs/index.d.ts
@@ -14,7 +14,7 @@ type BlakeJsContext = {
     outlen: number
 };
 
-interface blakejs {
+interface BlakeJs {
     blake2b: (data: Buffer | Uint8Array | string, key?: Uint8Array | null, outlen?: number) => Uint8Array,
     blake2bFinal: (context: BlakeJsContext) => Uint8Array,
     blake2bHex: (data: Buffer | Uint8Array | string, key?: Uint8Array | null, outlen?: number) => string,
@@ -27,5 +27,7 @@ interface blakejs {
     blake2sUpdate: (context: BlakeJsContext, data: Buffer | Uint8Array | string) => void
 }
 
-export = blakejs;
+const blakejs: BlakeJs;
+
+export default blakejs;
 }
diff --git a/bn.js/bn.js-tests.ts b/bn.js/bn.js-tests.ts
index b0cbfcd..ce4f2f9 100644
--- a/bn.js/bn.js-tests.ts
+++ b/bn.js/bn.js-tests.ts
@@ -1,4 +1,4 @@
-import BN = require('bn.js');
+import BN from 'bn.js';
 
 let bn = new BN(42);
 bn = bn.add(bn);
diff --git a/interface-connection/index.d.ts b/interface-connection/index.d.ts
index a4c16e3..be846bc 100644
--- a/interface-connection/index.d.ts
+++ b/interface-connection/index.d.ts
@@ -3,10 +3,13 @@
 // Definitions by: Jaco Greeff <https://github.com/jacogr>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
-import PeerInfo = require('peer-info');
+// @ts-ignore
+import PeerInfo from 'peer-info';
 
-declare interface Connection {
+declare module 'interface-connection' {
+interface Connection {
     getPeerInfo (cb: (error: Error | null, peerInfo?: PeerInfo) => any): void;
 }
 
 export = Connection;
+}
diff --git a/interface-transport/index.d.ts b/interface-transport/index.d.ts
index 0567dc8..86062c0 100644
--- a/interface-transport/index.d.ts
+++ b/interface-transport/index.d.ts
@@ -3,7 +3,9 @@
 // Definitions by: Jaco Greeff <https://github.com/jacogr>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
-declare interface Transport {
+declare module 'interface-transport' {
+interface Transport {
 }
 
 export = Transport;
+}
diff --git a/keccak/index.d.ts b/keccak/index.d.ts
index ea85c2f..019f3db 100644
--- a/keccak/index.d.ts
+++ b/keccak/index.d.ts
@@ -16,7 +16,7 @@ interface KeccakHasher {
 
 type KeccakTypes = 'keccak224' | 'keccak256' | 'keccak384' | 'keccak512' | 'sha3-224' | 'sha3-256' | 'sha3-384' | 'sha3-512' | 'shake128' | 'shake256';
 
-type keccak = (type: KeccakTypes) => KeccakHasher;
+const keccak: (type: KeccakTypes) => KeccakHasher;
 
-export = keccak;
+export default keccak;
 }
diff --git a/keccak/keccak-tests.ts b/keccak/keccak-tests.ts
index 18e222d..a3e7b2c 100644
--- a/keccak/keccak-tests.ts
+++ b/keccak/keccak-tests.ts
@@ -1,4 +1,4 @@
-import createKeccak = require('keccak');
+import createKeccak from 'keccak';
 
 const context = createKeccak('keccak256');
 
diff --git a/libp2p-kad-dht/index.d.ts b/libp2p-kad-dht/index.d.ts
index 1a87e64..dea4dd6 100644
--- a/libp2p-kad-dht/index.d.ts
+++ b/libp2p-kad-dht/index.d.ts
@@ -3,7 +3,11 @@
 // Definitions by: Jaco Greeff <https://github.com/jacogr>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
-declare class LibP2pKadDht {
+declare module 'libp2p-kad-dht' {
+export class LibP2pKadDht {
 }
 
-export = LibP2pKadDht;
+const DHT: typeof LibP2pKadDht;
+
+export default DHT;
+}
diff --git a/libp2p-mdns/index.d.ts b/libp2p-mdns/index.d.ts
index 43466f3..ae7a59b 100644
--- a/libp2p-mdns/index.d.ts
+++ b/libp2p-mdns/index.d.ts
@@ -3,8 +3,10 @@
 // Definitions by: Jaco Greeff <https://github.com/jacogr>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
-import PeerInfo = require('peer-info');
+// @ts-ignore
+import PeerInfo from 'peer-info';
 
+declare module 'libp2p-mdns' {
 type Options = {
   broadcast?: boolean,
   interval?: number,
@@ -15,10 +17,13 @@ type Options = {
 
 type Events = 'peer';
 
-declare class LibP2pMdns {
+export class LibP2pMdns {
   constructor (options: Options);
 
   on (event: Events, cb: (peerInfo: PeerInfo) => any): void;
 }
 
-export = LibP2pMdns;
+const Mdns: typeof LibP2pMdns;
+
+export default Mdns;
+}
diff --git a/libp2p-mplex/index.d.ts b/libp2p-mplex/index.d.ts
index 67e45ec..6b96ba4 100644
--- a/libp2p-mplex/index.d.ts
+++ b/libp2p-mplex/index.d.ts
@@ -3,9 +3,10 @@
 // Definitions by: Jaco Greeff <https://github.com/jacogr>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
+declare module 'libp2p-mplex' {
 type Muxer = {};
 
-declare type LibP2pMplex = {
+export type LibP2pMplex = {
   (conn: any, isListener: boolean): Muxer;
 
   dialer (conn: any): Muxer;
@@ -14,4 +15,7 @@ declare type LibP2pMplex = {
   muticodec: string;
 }
 
-export = LibP2pMplex;
+const mplex: LibP2pMplex;
+
+export default mplex;
+}
diff --git a/libp2p-railing/index.d.ts b/libp2p-railing/index.d.ts
index 43d8ad6..9056f08 100644
--- a/libp2p-railing/index.d.ts
+++ b/libp2p-railing/index.d.ts
@@ -3,9 +3,12 @@
 // Definitions by: Jaco Greeff <https://github.com/jacogr>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
-import MultiAddr = require('multiaddr');
-import PeerInfo = require('peer-info');
+// @ts-ignore
+import MultiAddr from 'multiaddr';
+// @ts-ignore
+import PeerInfo from 'peer-info';
 
+declare module 'libp2p-railing' {
 type Options = {
   list: Array<string | MultiAddr>,
   interval?: number
@@ -13,10 +16,11 @@ type Options = {
 
 type Events = 'peer';
 
-declare class LibP2pRailing {
+export class LibP2pRailing {
   constructor (options: Options);
 
   on (event: Events, cb: (peerInfo: PeerInfo) => any): void;
 }
 
 export = LibP2pRailing;
+}
diff --git a/libp2p-secio/index.d.ts b/libp2p-secio/index.d.ts
index fa05df4..b79d810 100644
--- a/libp2p-secio/index.d.ts
+++ b/libp2p-secio/index.d.ts
@@ -3,12 +3,17 @@
 // Definitions by: Jaco Greeff <https://github.com/jacogr>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
-import PeerId = require('peer-id');
+// @ts-ignore
+import PeerId from 'peer-id';
 
-declare type LibP2pSecio = {
+declare module 'libp2p-secio' {
+export type LibP2pSecio = {
   tag: '/secio/1.0.0',
 
   encrypt (localId: PeerId, conn: any, remoteId: PeerId, callback: () => any): void
 }
 
-export = LibP2pSecio;
+const secio: LibP2pSecio;
+
+export default secio;
+}
diff --git a/libp2p-spdy/index.d.ts b/libp2p-spdy/index.d.ts
index 570015a..4f2289a 100644
--- a/libp2p-spdy/index.d.ts
+++ b/libp2p-spdy/index.d.ts
@@ -3,9 +3,10 @@
 // Definitions by: Jaco Greeff <https://github.com/jacogr>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
+declare module 'libp2p-spdy' {
 type Muxer = {};
 
-declare type LibP2pSpdy = {
+export type LibP2pSpdy = {
   (conn: any, isListener: boolean): Muxer;
 
   dialer (conn: any): Muxer;
@@ -14,4 +15,7 @@ declare type LibP2pSpdy = {
   muticodec: string;
 }
 
-export = LibP2pSpdy;
+const spdy: LibP2pSpdy;
+
+export default spdy;
+}
diff --git a/libp2p-spdy/libp2p-spdy-tests.ts b/libp2p-spdy/libp2p-spdy-tests.ts
index e69de29..6663f4d 100644
--- a/libp2p-spdy/libp2p-spdy-tests.ts
+++ b/libp2p-spdy/libp2p-spdy-tests.ts
@@ -0,0 +1 @@
+import spdy from 'libp2p-spdy';
diff --git a/libp2p-tcp/index.d.ts b/libp2p-tcp/index.d.ts
index 0a7df9d..b4ab398 100644
--- a/libp2p-tcp/index.d.ts
+++ b/libp2p-tcp/index.d.ts
@@ -3,9 +3,12 @@
 // Definitions by: Jaco Greeff <https://github.com/jacogr>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
-import Transport = require('interface-transport');
+// @ts-ignore
+import Transport from 'interface-transport';
 
-declare class LibP2pTcp implements Transport {
+declare module 'libp2p-tcp' {
+export class LibP2pTcp implements Transport {
 }
 
 export = LibP2pTcp;
+}
diff --git a/libp2p-webrtc-direct/index.d.ts b/libp2p-webrtc-direct/index.d.ts
index 5077f4c..d31b1d9 100644
--- a/libp2p-webrtc-direct/index.d.ts
+++ b/libp2p-webrtc-direct/index.d.ts
@@ -3,9 +3,12 @@
 // Definitions by: Jaco Greeff <https://github.com/jacogr>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
-import Transport = require('interface-transport');
+// @ts-ignore
+import Transport from 'interface-transport';
 
-declare class LibP2pWebRtcDirect implements Transport {
+declare module 'libp2p-webrtc-direct' {
+export class LibP2pWebRtcDirect implements Transport {
 }
 
 export = LibP2pWebRtcDirect;
+}
diff --git a/libp2p-webrtc-star/index.d.ts b/libp2p-webrtc-star/index.d.ts
index f90dae9..be95640 100644
--- a/libp2p-webrtc-star/index.d.ts
+++ b/libp2p-webrtc-star/index.d.ts
@@ -3,9 +3,12 @@
 // Definitions by: Jaco Greeff <https://github.com/jacogr>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
-import Transport = require('interface-transport');
+// @ts-ignore
+import Transport from 'interface-transport';
 
-declare class LibP2pWebRtcStar implements Transport {
+declare module 'libp2p-webrtc-star' {
+export class LibP2pWebRtcStar implements Transport {
 }
 
 export = LibP2pWebRtcStar;
+}
diff --git a/libp2p-websockets/index.d.ts b/libp2p-websockets/index.d.ts
index 7cfcfa1..69f8c61 100644
--- a/libp2p-websockets/index.d.ts
+++ b/libp2p-websockets/index.d.ts
@@ -3,9 +3,12 @@
 // Definitions by: Jaco Greeff <https://github.com/jacogr>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
-import Transport = require('interface-transport');
+// @ts-ignore
+import Transport from 'interface-transport';
 
-declare class LibP2pWebsockets implements Transport {
+declare module 'libp2p-websockets' {
+export class LibP2pWebsockets implements Transport {
 }
 
 export = LibP2pWebsockets;
+}
diff --git a/libp2p/index.d.ts b/libp2p/index.d.ts
index bb8dc22..b2a837f 100644
--- a/libp2p/index.d.ts
+++ b/libp2p/index.d.ts
@@ -3,17 +3,28 @@
 // Definitions by: Jaco Greeff <https://github.com/jacogr>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
-import Connection = require('interface-connection');
-import Transport = require('interface-transport');
-import Libp2pKadDHT = require('libp2p-kad-dht');
-import LibP2pMdns = require('libp2p-mdns');
-import LibP2pMplex = require('libp2p-mplex');
-import LibP2pRailing = require('libp2p-railing');
-import LibP2pSecio = require('libp2p-secio');
-import LibP2pSpdy = require('libp2p-spdy');
-import PeerBook = require('peer-book');
-import PeerInfo = require('peer-info');
+// @ts-ignore
+import Connection from 'interface-connection';
+// @ts-ignore
+import Transport from 'interface-transport';
+// @ts-ignore
+import { Libp2pKadDHT } from 'libp2p-kad-dht';
+// @ts-ignore
+import LibP2pMdns from 'libp2p-mdns';
+// @ts-ignore
+import { LibP2pMplex } from 'libp2p-mplex';
+// @ts-ignore
+import LibP2pRailing from 'libp2p-railing';
+// @ts-ignore
+import { LibP2pSecio } from 'libp2p-secio';
+// @ts-ignore
+import { LibP2pSpdy } from 'libp2p-spdy';
+// @ts-ignore
+import PeerBook from 'peer-book';
+// @ts-ignore
+import PeerInfo from 'peer-info';
 
+declare module 'libp2p' {
 type CreateOptions = {
     DHT: typeof Libp2pKadDHT,
     connection: {
@@ -26,7 +37,7 @@ type CreateOptions = {
 
 type Events = 'peer:connect' | 'peer:disconnect' | 'peer:discovery' | 'start' | 'stop';
 
-declare class LibP2p {
+export class LibP2p {
     constructor (peerInfo: PeerInfo, PeerBook: PeerBook, options: CreateOptions);
 
     dial (peerInfo: PeerInfo, cb: (error: Error | null) => any): void;
@@ -38,4 +49,5 @@ declare class LibP2p {
     stop (cb: (error: Error | null) => any): void;
 }
 
-export = LibP2p;
+export default LibP2p;
+}
diff --git a/multiaddr/index.d.ts b/multiaddr/index.d.ts
index b9b9116..f882ff3 100644
--- a/multiaddr/index.d.ts
+++ b/multiaddr/index.d.ts
@@ -5,8 +5,10 @@
 
 /// <reference types="node"/>
 
-import PeerId = require('peer-id');
+// @ts-ignore
+import PeerId from 'peer-id';
 
+declare module 'multiaddr' {
 type Address = {
     family: string,
     host: string,
@@ -27,7 +29,7 @@ type Tuple = [ number, Buffer ];
 
 type TupleString = [ number, string ];
 
-declare class MultiAddr {
+class MultiAddr {
     constructor (addr: MultiAddr | Buffer | string);
 
     static isMultiAddr (addr: any): addr is MultiAddr;
@@ -51,3 +53,4 @@ declare class MultiAddr {
 }
 
 export = MultiAddr;
+}
diff --git a/package.json b/package.json
index 36f09e2..948e5df 100644
--- a/package.json
+++ b/package.json
@@ -7,7 +7,7 @@
   "license": "ISC",
   "scripts": {
     "build": "./build.sh",
-    "check": "echo \"No 'yarn run check' available\"",
+    "check": "tsc --noEmit",
     "test": "echo \"No 'yarn run test' available\""
   },
   "devDependencies": {
diff --git a/peer-book/index.d.ts b/peer-book/index.d.ts
index 30ab90d..7053d53 100644
--- a/peer-book/index.d.ts
+++ b/peer-book/index.d.ts
@@ -3,10 +3,13 @@
 // Definitions by: Jaco Greeff <https://github.com/jacogr>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
-import PeerId = require('peer-id');
-import PeerInfo = require('peer-info');
+// @ts-ignore
+import PeerId from 'peer-id';
+// @ts-ignore
+import PeerInfo from 'peer-info';
 
-declare class PeerBook {
+declare module 'peer-book' {
+class PeerBook {
     constructor ();
 
     get (peer: PeerId | PeerInfo | string): PeerInfo;
@@ -19,3 +22,4 @@ declare class PeerBook {
 }
 
 export = PeerBook;
+}
diff --git a/peer-id/index.d.ts b/peer-id/index.d.ts
index 60ab1ef..6c5e730 100644
--- a/peer-id/index.d.ts
+++ b/peer-id/index.d.ts
@@ -5,6 +5,7 @@
 
 /// <reference types="node"/>
 
+declare module 'peer-id' {
 type CreateCb = (error: Error | null, peerId?: PeerId) => any;
 
 type CreateOptions = {
@@ -17,7 +18,7 @@ type JSON = {
     privKey: string
 };
 
-declare class PeerId {
+class PeerId {
     constructor (id: Buffer, privKey?: any, pubKey?: any);
 
     static create (optsOrCb: CreateOptions | CreateCb, cb?: CreateCb): PeerId;
@@ -36,3 +37,4 @@ declare class PeerId {
 }
 
 export = PeerId;
+}
diff --git a/peer-info/index.d.ts b/peer-info/index.d.ts
index 9c0f8b9..6e38002 100644
--- a/peer-info/index.d.ts
+++ b/peer-info/index.d.ts
@@ -5,9 +5,12 @@
 
 /// <reference types="node"/>
 
-import MultiAddr = require('multiaddr');
-import PeerId = require('peer-id');
+// @ts-ignore
+import MultiAddr from 'multiaddr';
+// @ts-ignore
+import PeerId from 'peer-id';
 
+declare module 'peer-info' {
 type CreateCb = (error: Error | null, peerId?: PeerId) => any;
 
 type CreateOptions = {
@@ -32,7 +35,7 @@ type MultiAddrSet = {
     toArray (): MultiAddr[];
 };
 
-declare class PeerInfo {
+class PeerInfo {
     constructor (id?: PeerId);
 
     static create (optsOrCb: CreateOptions | CreateCb, cb?: CreateCb): PeerInfo;
@@ -46,3 +49,4 @@ declare class PeerInfo {
 }
 
 export = PeerInfo;
+}
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 0000000..46c8571
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,3 @@
+{
+  "extends": "./node_modules/@polkadot/dev/config/tsconfig"
+}
diff --git a/tweetnacl/index.d.ts b/tweetnacl/index.d.ts
index c25fe3f..fa61964 100644
--- a/tweetnacl/index.d.ts
+++ b/tweetnacl/index.d.ts
@@ -56,5 +56,7 @@ type TweetNacl = {
     sign: Sign
 };
 
-export = TweetNacl;
+const tweetnacl: TweetNacl;
+
+export default tweetnacl;
 }
diff --git a/tweetnacl/tweetnacl-tests.ts b/tweetnacl/tweetnacl-tests.ts
index e69de29..96fbb7f 100644
--- a/tweetnacl/tweetnacl-tests.ts
+++ b/tweetnacl/tweetnacl-tests.ts
@@ -0,0 +1,3 @@
+import nacl from 'tweetnacl';
+
+nacl.randomBytes(24);