Status type (#256)

packages/types/src/Null.ts

@@ -0,0 +1,36 @@
+// Copyright 2017-2018 @polkadot/types authors & contributors
+// This software may be modified and distributed under the terms
+// of the ISC license. See the LICENSE file for details.
+
+import Base from './codec/Base';
+
+// Implements a type that does not contain anything (apart from `null`)
+export default class Null extends Base<null> {
+  constructor () {
+    super(null);
+  }
+
+  byteLength (): number {
+    return 0;
+  }
+
+  fromJSON (input: any): Null {
+    return this;
+  }
+
+  fromU8a (input: Uint8Array): Null {
+    return this;
+  }
+
+  toJSON (): any {
+    return null;
+  }
+
+  toU8a (isBare?: boolean): Uint8Array {
+    return new Uint8Array();
+  }
+
+  toString (): string {
+    return '';
+  }
+}

packages/types/src/Status.ts

@@ -0,0 +1,32 @@
+// Copyright 2017-2018 @polkadot/types authors & contributors
+// This software may be modified and distributed under the terms
+// of the ISC license. See the LICENSE file for details.
+
+import EnumType from './codec/EnumType';
+import Vector from './codec/Vector';
+import Hash from './Hash';
+import Null from './Null';
+import Text from './Text';
+
+export class Broadcast extends Vector.with(Text) {
+}
+
+export class Dropped extends Null {
+}
+
+export class Finalised extends Hash {
+}
+
+export class Usurped extends Hash {
+}
+
+export default class Status extends EnumType<Finalised | Usurped | Broadcast | Dropped> {
+  constructor (index?: number) {
+    super([
+      Finalised,
+      Usurped,
+      Broadcast,
+      Dropped
+    ], index);
+  }
+}

packages/types/src/index.ts

@@ -42,6 +42,8 @@ export { default as MethodIndex } from './MethodIndex';
 export { default as MisbehaviorReport } from './MisbehaviorReport';
 export { default as Moment } from './Moment';
 export { default as NewAccountOutcome } from './NewAccountOutcome';
+// NOTE only used internally atm
+// export { default as Null } from './Null';
 // NOTE Nonce is renamed to Index
 export { default as Index } from './Nonce';
 export { default as Origin } from './Origin';
@@ -56,6 +58,7 @@ export { default as ReferendumIndex } from './ReferendumIndex';
 export { default as RuntimeVersion } from './RuntimeVersion';
 export { default as Signature } from './Signature';
 export { default as SignedBlock } from './SignedBlock';
+export { default as Status } from './Status';
 export { default as StorageChangeSet } from './StorageChangeSet';
 export { default as StorageData } from './StorageData';
 export { default as StorageKey } from './StorageKey';