diff --git a/packages/api/src/Base.ts b/packages/api/src/Base.ts
index 237cdbc038..032d6f98f3 100644
--- a/packages/api/src/Base.ts
+++ b/packages/api/src/Base.ts
@@ -11,9 +11,7 @@ import extrinsicsFromMeta from '@polkadot/extrinsics/fromMetadata';
 import { Storage } from '@polkadot/storage/types';
 import storageFromMeta from '@polkadot/storage/fromMetadata';
 import registry from '@polkadot/types/codec/typeRegistry';
-import { Hash, Method, RuntimeVersion } from '@polkadot/types/index';
-import Event from '@polkadot/types/Event';
-import RuntimeMetadata from '@polkadot/types/Metadata';
+import { Event, Hash, Metadata, Method, RuntimeVersion } from '@polkadot/types/index';
 import { Extrinsics } from '@polkadot/types/Method';
 import { assert, isFunction, isObject, isUndefined, logger } from '@polkadot/util';
 
@@ -36,7 +34,7 @@ export default abstract class ApiBase<R, S, E> implements ApiBaseInterface<R, S,
   protected _query?: S;
   protected _rpc: R;
   protected _rpcBase: Rpc;
-  protected _runtimeMetadata?: RuntimeMetadata;
+  protected _runtimeMetadata?: Metadata;
   protected _runtimeVersion?: RuntimeVersion;
 
   /**
@@ -92,10 +90,10 @@ export default abstract class ApiBase<R, S, E> implements ApiBaseInterface<R, S,
   /**
    * @description Yields the current attached runtime metadata. Generally this is only used to construct extrinsics & storage, but is useful for current runtime inspection.
    */
-  get runtimeMetadata (): RuntimeMetadata {
+  get runtimeMetadata (): Metadata {
     assert(!isUndefined(this._runtimeMetadata), INIT_ERROR);
 
-    return this._runtimeMetadata as RuntimeMetadata;
+    return this._runtimeMetadata as Metadata;
   }
 
   /**
diff --git a/packages/type-jsonrpc/src/create/param.ts b/packages/type-jsonrpc/src/create/param.ts
index 7a506334ff..4bb29bd521 100644
--- a/packages/type-jsonrpc/src/create/param.ts
+++ b/packages/type-jsonrpc/src/create/param.ts
@@ -2,7 +2,7 @@
 // This software may be modified and distributed under the terms
 // of the Apache-2.0 license. See the LICENSE file for details.
 
-import { CodecTypes } from '@polkadot/types/types';
+import { CodecTypes } from '@polkadot/types/classes';
 import { RpcParam } from '../types';
 
 type RpcParamOptions = {
diff --git a/packages/type-jsonrpc/src/types.ts b/packages/type-jsonrpc/src/types.ts
index feb7476d11..9dec07b6eb 100644
--- a/packages/type-jsonrpc/src/types.ts
+++ b/packages/type-jsonrpc/src/types.ts
@@ -2,7 +2,7 @@
 // This software may be modified and distributed under the terms
 // of the Apache-2.0 license. See the LICENSE file for details.
 
-import { CodecTypes } from '@polkadot/types/types';
+import { CodecTypes } from '@polkadot/types/classes';
 
 export type RpcParam = {
   isOptional: boolean,
diff --git a/packages/types/src/classes.ts b/packages/types/src/classes.ts
new file mode 100644
index 0000000000..85a0e87547
--- /dev/null
+++ b/packages/types/src/classes.ts
@@ -0,0 +1,7 @@
+// Copyright 2017-2018 @polkadot/types authors & contributors
+// This software may be modified and distributed under the terms
+// of the Apache-2.0 license. See the LICENSE file for details.
+
+import * as Classes from './index';
+
+export type CodecTypes = keyof typeof Classes;
diff --git a/packages/types/src/codec/Compact.ts b/packages/types/src/codec/Compact.ts
index a2e46d6691..c48c985d2c 100644
--- a/packages/types/src/codec/Compact.ts
+++ b/packages/types/src/codec/Compact.ts
@@ -3,7 +3,7 @@
 // of the Apache-2.0 license. See the LICENSE file for details.
 
 import BN from 'bn.js';
-import { bnToBn, compactAddLength, compactFromU8a, compactStripLength, compactToU8a, hexToBn, isBn, isHex, isNumber, isString, isU8a } from '@polkadot/util';
+import { bnToBn, compactAddLength, compactFromU8a, compactStripLength, compactToU8a, hexToBn, isBn, isHex, isNumber, isString } from '@polkadot/util';
 import { DEFAULT_BITLENGTH } from '@polkadot/util/compact/defaults';
 
 import { AnyNumber, Codec, Constructor } from '../types';
@@ -56,13 +56,11 @@ export default class Compact extends Base<UInt | Moment> implements Codec {
       );
     } else if (isNumber(value) || isBn(value)) {
       return new Type(bnToBn(value));
-    } else if (isU8a(value)) {
-      const [, _value] = Compact.decodeU8a(value, new Type(0).bitLength());
-
-      return new Type(_value);
     }
 
-    return new Type(value.toBn());
+    const [, _value] = Compact.decodeU8a(value, new Type(0).bitLength());
+
+    return new Type(_value);
   }
 
   /**
diff --git a/packages/types/src/types.ts b/packages/types/src/types.ts
index 03b11e478e..9a46279306 100644
--- a/packages/types/src/types.ts
+++ b/packages/types/src/types.ts
@@ -3,11 +3,8 @@
 // of the Apache-2.0 license. See the LICENSE file for details.
 
 import BN from 'bn.js';
-import * as Classes from './index';
 
-import { UInt } from './codec';
-
-export type AnyNumber = UInt | BN | Uint8Array | number | string;
+export type AnyNumber = BN | Uint8Array | number | string;
 
 export type AnyString = string | String;
 
@@ -51,8 +48,6 @@ export interface Codec {
 
 export type CodecTo = 'toHex' | 'toJSON' | 'toString' | 'toU8a';
 
-export type CodecTypes = keyof typeof Classes;
-
 export type Constructor<T = Codec> = { new(value?: any): T };
 
 export type ConstructorDef<T = Codec> = { [index: string]: Constructor<T> };