Add {AccountId, Balance, Moment, Seed}Of (#687)

packages/types/src/AccountIdOf.ts

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+// Copyright 2017-2019 @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 AccountId from './AccountId';
+
+/**
+ * @name AccountIdOf
+ * @description
+ * The Substrate AccountIdOf representation as a [[AccountId]].
+ */
+export default class AccountIdOf extends AccountId {
+}

packages/types/src/BalanceOf.ts

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+// Copyright 2017-2019 @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 Balance from './Balance';
+
+/**
+ * @name BalanceOf
+ * @description
+ * The Substrate BalanceOf representation as a [[Balance]].
+ */
+export default class BalanceOf extends Balance {
+}

packages/types/src/MomentOf.ts

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+// Copyright 2017-2019 @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 Moment from './Moment';
+
+/**
+ * @name MomentOf
+ * @description
+ * The Substrate MomentOf representation as a [[Moment]].
+ */
+export default class MomentOf extends Moment {
+}

packages/types/src/SeedOf.ts

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+// Copyright 2017-2019 @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 Hash from './Hash';
+
+/**
+ * @name SeedOf
+ * @description
+ * The Substrate SeedOf representation as a [[Hash]].
+ */
+export default class SeedOf extends Hash {
+}