fix: return type of deleteMany should be the cids you deleted (#311)

It should not leak datastore keys, instead return the cid you deleted.

Lets us not depend on ipfs-repo or interface-datastore in the types of
ipfs-blockstore, then ipld, then ipfs-http-client.

package.json

@@ -81,7 +81,6 @@
     "ipfs-utils": "^6.0.0",
     "ipld-block": "^0.11.0",
     "it-filter": "^1.0.2",
-    "it-map": "^1.0.2",
     "it-pushable": "^1.4.0",
     "just-safe-get": "^2.0.0",
     "just-safe-set": "^2.1.0",

src/blockstore.js

@@ -3,7 +3,6 @@
 const { shard, ShardingDatastore } = require('datastore-core')
 const Block = require('ipld-block')
 const { cidToKey, keyToCid } = require('./blockstore-utils')
-const map = require('it-map')
 const drain = require('it-drain')
 const pushable = require('it-pushable')
 /**
@@ -135,7 +134,21 @@ function createBaseStore (store) {
     },
 
     deleteMany (cids, options) {
-      return store.deleteMany(map(cids, cid => cidToKey(cid)), options)
+      const out = pushable()
+
+      drain(store.deleteMany((async function * () {
+        for await (const cid of cids) {
+          yield cidToKey(cid)
+
+          out.push(cid)
+        }
+
+        out.end()
+      }()), options)).catch(err => {
+        out.end(err)
+      })
+
+      return out
     },
 
     close () {

src/types.d.ts

@@ -105,7 +105,7 @@ export interface Blockstore {
   /**
    * Delete a block from the store
    */
-  deleteMany: (cids: AwaitIterable<any>, options?: DatastoreOptions) => AsyncIterable<Key>
+  deleteMany: (cids: AwaitIterable<any>, options?: DatastoreOptions) => AsyncIterable<CID>
 
   /**
    * Close the store

test/blockstore-test.js

@@ -440,9 +440,11 @@ module.exports = (repo) => {
 
     describe('.deleteMany', () => {
       it('simple', async () => {
-        await drain(repo.blocks.deleteMany([b.cid]))
+        const deleted = await all(repo.blocks.deleteMany([b.cid]))
         const exists = await repo.blocks.has(b.cid)
         expect(exists).to.equal(false)
+        expect(deleted).to.have.lengthOf(1)
+        expect(deleted[0]).to.deep.equal(b.cid)
       })
 
       it('including identity cid', async () => {