feat: add null_topic and null_stamp (#958)

src/utils/expose.ts

@@ -1,33 +1,35 @@
+import { BatchId, Topic } from '..'
+
 export { getCollectionSize } from './collection'
 export { getFolderSize } from './collection.node'
 
 export {
-  Bytes,
-  FlexBytes,
   assertBytes,
   assertFlexBytes,
+  Bytes,
   bytesAtOffset,
   bytesEqual,
+  FlexBytes,
   flexBytesAtOffset,
   isBytes,
   isFlexBytes,
 } from './bytes'
 
 export {
-  HexString,
-  PrefixedHexString,
   assertHexString,
   assertPrefixedHexString,
   bytesToHex,
+  HexString,
   hexToBytes,
   intToHex,
   isHexString,
   makeHexString,
+  PrefixedHexString,
 } from './hex'
 
 export {
-  EthAddress,
   capitalizeAddressERC55,
+  EthAddress,
   ethToSwarmAddress,
   fromLittleEndian,
   isHexEthAddress,
@@ -52,3 +54,6 @@ export {
 } from './stamps'
 
 export { approximateOverheadForRedundancyLevel, getRedundancyStat, getRedundancyStats } from './redundancy'
+
+export const NULL_STAMP: BatchId = '0000000000000000000000000000000000000000000000000000000000000000' as BatchId
+export const NULL_TOPIC: Topic = '0000000000000000000000000000000000000000000000000000000000000000' as Topic

test/integration/feed/index.spec.ts

@@ -5,6 +5,7 @@ import * as chunkAPI from '../../../src/modules/chunk'
 import { fetchLatestFeedUpdate } from '../../../src/modules/feed'
 import type { BeeRequestOptions, BytesReference, PrivateKeyBytes, Signer, Topic } from '../../../src/types'
 import { assertBytes, Bytes } from '../../../src/utils/bytes'
+import { NULL_TOPIC } from '../../../src/utils/expose'
 import { hexToBytes, makeHexString } from '../../../src/utils/hex'
 import { beeKyOptions, getPostageBatch, testIdentity } from '../../utils'
 
@@ -44,7 +45,7 @@ describe('feed', () => {
   const BEE_REQUEST_OPTIONS = beeKyOptions()
   const owner = makeHexString(testIdentity.address, 40)
   const signer = makePrivateKeySigner(hexToBytes(testIdentity.privateKey) as PrivateKeyBytes)
-  const topic = '0000000000000000000000000000000000000000000000000000000000000000' as Topic
+  const topic = NULL_TOPIC
 
   it('empty feed update', async function () {
     const emptyTopic = '1000000000000000000000000000000000000000000000000000000000000000' as Topic

test/integration/modules/feed.spec.ts

@@ -1,6 +1,7 @@
 import { createFeedManifest, fetchLatestFeedUpdate } from '../../../src/modules/feed'
 import { upload as uploadSOC } from '../../../src/modules/soc'
 import type { Topic } from '../../../src/types'
+import { NULL_TOPIC } from '../../../src/utils/expose'
 import { HexString, hexToBytes, makeHexString } from '../../../src/utils/hex'
 import { beeKyOptions, commonMatchers, getPostageBatch, testIdentity } from '../../utils'
 
@@ -9,7 +10,7 @@ commonMatchers()
 describe('modules/feed', () => {
   const BEE_REQUEST_OPTIONS = beeKyOptions()
   const owner = makeHexString(testIdentity.address, 40)
-  const topic = '0000000000000000000000000000000000000000000000000000000000000000' as Topic
+  const topic = NULL_TOPIC
 
   it('feed manifest creation', async function () {
     const reference = '92442c3e08a308aeba8e2d231733ec57011a203354cad24129e7e0c37bac0cbe'