implemented named event handler

package-lock.json

@@ -1032,6 +1032,12 @@
       "integrity": "sha1-Lhj/PS9JqydlzskCPwEdqo2DSaE=",
       "dev": true
     },
+    "ez-async": {
+      "version": "1.0.0-alpha.1",
+      "resolved": "https://registry.npmjs.org/ez-async/-/ez-async-1.0.0-alpha.1.tgz",
+      "integrity": "sha1-ysNCuPqJAm7+c6Jg/p9rgE9J5H8=",
+      "dev": true
+    },
     "fast-levenshtein": {
       "version": "2.0.6",
       "resolved": "https://registry.npmjs.org/fast-levenshtein/-/fast-levenshtein-2.0.6.tgz",
@@ -2930,6 +2936,12 @@
         }
       }
     },
+    "tag-dist-files": {
+      "version": "0.1.6",
+      "resolved": "https://registry.npmjs.org/tag-dist-files/-/tag-dist-files-0.1.6.tgz",
+      "integrity": "sha1-h64FrBQw1H2m76Hrx7Bw+QxnTVQ=",
+      "dev": true
+    },
     "text-table": {
       "version": "0.2.0",
       "resolved": "https://registry.npmjs.org/text-table/-/text-table-0.2.0.tgz",

package.json

@@ -6,16 +6,17 @@
   "scripts": {
     "lint": "standard",
     "dist": "rollup -c rollup.dist.js",
-    "serve": "concurrently 'serve ..' 'rollup -wc rollup.dist.js -o examples/bower_components/yjs/y.js'"
+    "serve": "concurrently 'serve ..' 'rollup -wc rollup.dist.js -o examples/bower_components/yjs/y.js'",
+    "postversion": "npm run lint && npm run dist",
+    "postpublish": "tag-dist-files --overwrite-existing-tag"
   },
-  "pre-commit": [
-    "lint",
-    "test"
+  "files": [
+    "y.*"
   ],
   "standard": {
     "ignore": [
-      "./y.js",
-      "./y.js.map"
+      "/y.js",
+      "/y.js.map"
     ]
   },
   "repository": {
@@ -40,10 +41,10 @@
   "homepage": "http://y-js.org",
   "devDependencies": {
     "babel-cli": "^6.24.1",
-    "babel-preset-latest": "^6.24.1",
     "babel-plugin-external-helpers": "^6.22.0",
     "babel-plugin-transform-regenerator": "^6.24.1",
     "babel-plugin-transform-runtime": "^6.23.0",
+    "babel-preset-latest": "^6.24.1",
     "chance": "^1.0.9",
     "concurrently": "^3.4.0",
     "rollup-plugin-babel": "^2.7.1",
@@ -54,7 +55,8 @@
     "rollup-plugin-uglify": "^1.0.2",
     "rollup-regenerator-runtime": "^6.23.1",
     "rollup-watch": "^3.2.2",
-    "standard": "^10.0.2"
+    "standard": "^10.0.2",
+    "tag-dist-files": "^0.1.6"
   },
   "dependencies": {
     "debug": "^2.6.8"

src/Transaction.js

@@ -294,8 +294,9 @@ export default function extendTransaction (Y) {
                 yield * this.ds.put(n)
               } else {
                 // already gc'd
-                throw new Error('Cannot happen! (it dit though.. :()')
-                // return n
+                throw new Error(
+                  'DS reached an inconsistent state. Please report this issue!'
+                )
               }
             }
           } else {

src/Utils.js

@@ -42,6 +42,32 @@ export default function Utils (Y) {
     }
   }
 
+  class NamedEventHandler {
+    constructor () {
+      this._eventListener = {}
+    }
+    on (name, f) {
+      if (this._eventListener[name] == null) {
+        this._eventListener[name] = []
+      }
+      this._eventListener[name].push(f)
+    }
+    off (name, f) {
+      if (name == null || f == null) {
+        throw new Error('You must specify event name and function!')
+      }
+      let listener = this._eventListener[name] || []
+      this._eventListener[name] = listener.filter(e => e !== f)
+    }
+    emit (name, value) {
+      (this._eventListener[name] || []).forEach(l => l(value))
+    }
+    destroy () {
+      this._eventListener = null
+    }
+  }
+  Y.utils.NamedEventHandler = NamedEventHandler
+
   class EventListenerHandler {
     constructor () {
       this.eventListeners = []

src/y.js

@@ -144,7 +144,7 @@ export default function Y (opts/* :YOptions */) /* :Promise<YConfig> */ {
   })
 }
 
-class YConfig {
+class YConfig extends Y.utils.NamedEventHandler {
   /* ::
   db: Y.AbstractDatabase;
   connector: Y.AbstractConnector;
@@ -152,6 +152,7 @@ class YConfig {
   options: Object;
   */
   constructor (opts, callback) {
+    super()
     this.options = opts
     this.db = new Y[opts.db.name](this, opts.db)
     this.connector = new Y[opts.connector.name](this, opts.connector)
@@ -215,6 +216,9 @@ class YConfig {
       } else {
         return Promise.resolve()
       }
+    }).then(() => {
+      // remove existing event listener
+      super.destroy()
     })
   }
   close () {