fix: export reference impl

src/index.js

@@ -1,11 +1,61 @@
 'use strict'
 
-const readWrite = require('./read-write')
-const exists = require('./exists')
-const remove = require('./remove')
-
-module.exports = (common) => {
-  readWrite(common)
-  exists(common)
-  remove(common)
+const createWrite = require('pull-write')
+const pull = require('pull-stream')
+
+module.exports = class MemoryBlobStore {
+  constructor () {
+    this.store = {}
+  }
+
+  write (key, cb) {
+    cb = cb || (() => {})
+
+    if (!key) {
+      return cb(new Error('Missing key'))
+    }
+
+    this.store[key] = new Buffer([])
+
+    return createWrite((data, cb) => {
+      this.store[key] = Buffer.concat(
+        [this.store[key]].concat(data)
+      )
+      cb()
+    }, null, 100, cb)
+  }
+
+  read (key) {
+    if (!key) {
+      return pull.error(new Error('Missing key'))
+    }
+
+    const place = this.store[key]
+    if (place) {
+      return pull.values([this.store[key]])
+    }
+
+    return pull.error(new Error(`Unkown key ${key}`))
+  }
+
+  exists (key, cb) {
+    cb = cb || (() => {})
+
+    if (!key) {
+      return cb(new Error('Missing key'))
+    }
+
+    cb(null, Boolean(this.store[key]))
+  }
+
+  remove (key, cb) {
+    cb = cb || (() => {})
+
+    if (!key) {
+      return cb(new Error('Missing key'))
+    }
+
+    delete this.store[key]
+    cb()
+  }
 }

src/tests.js

@@ -0,0 +1,11 @@
+'use strict'
+
+const readWrite = require('./read-write')
+const exists = require('./exists')
+const remove = require('./remove')
+
+module.exports = (common) => {
+  readWrite(common)
+  exists(common)
+  remove(common)
+}