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angular/router The New Angular Router

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Hi, I’m Nikas Front end dev @ Wix.com/app-market @nikaspran github/nikaspran nikas.praninskas.com

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The next 45 minutes of your life Prior art What is the New Angular Router? Migration Current state of affairs

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Disclaimer: everything is Work In Progress

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Prior art

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What ARE frogs Routers?

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Deep linking is awesome share information know at a glance contextualize bookmark The ability to

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Don’t break the back button The back button is free and obvious It is very easy to be annoying if you break navigation

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Structure for your app Forces you to modularize Makes apps easy to understand

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ngRoute The default Angular 1 routing solution

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ngRoute - very simple .config(function($routeProvider){ $routeProvider .when('/user/:id', { templateUrl: 'user.html', controller: 'UserCtrl', resolve: {...} }) .when('/user/:id/edit', { templateUrl: 'userEdit.html', controller: 'UserEditCtrl' }); }); One view per app One URL, one view

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Good things come to those who wait .when('/user/:id', { ..., resolve: { user: function($q) { var data = $q.defer(); //get user data from API return data.promise; } } }) Inject into controller from configuration Waits until promises resolve

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Simple, but too simple Difficult to do things like modals sidebars deep routes parallel views complex apps

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UI Router The de facto Angular 1 routing solution

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UI Router - much more powerful
State based routing .config(function($stateProvider){ $stateProvider .state('layout', { abstract: true, templateUrl: 'layout.html' }) .state('layout.user', { views: { sidebar: { templateUrl: 'sidebar.html', controller: 'SidebarCtrl', resolve: {...} }, content: {...} } }) });

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States are intuitive States describe architecture Not everything has to have a URL Easy to link to parts of your application

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Lots of utility

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$state.is() $state.go() $state.href() $state.includes() Lots of utility …

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Customizability is very important and UI Router does a pretty good job: christopherthielen/ui-router-extras onEnter, onExit, $stateChange*, ...

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…up to a point Do something complex enough and you start fighting the router

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Something complex enough

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Same URL, different background state

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Multiple paths that preserve history 1. Open App Market 2. Click App icon Use direct link to App (eg. via social) wix.com/app-market/:appName/overview

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we spent way too much time fighting our tools at the time, we did a fork still not obvious how to do it all

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Angular 2 is coming Can we do better with a clean slate?

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Introducing The New Angular Router

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Introducing The New Angular Router

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Introducing Component Router

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Goals

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Be customizable… Let people do complex interesting surprising amazing things

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…but have great defaults Make it obvious intuitive quick easy to learn and use

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Multiple views /foo/bar foo bar foo bar parallel nested OR

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State-like reverse routing Automatically deep link to components

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State-like reverse routing Link to multiple components at once sidebar content mainPage

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Thought experiment: The router is one of the most important parts of an application

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So… If it is designed for Angular 2

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If it is designed for Angular 2 but also works with Angular 1

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If it is designed for Angular 2 but also works with Angular 1 We have a migration plan! ng1 ng2

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Proposed migration scenario ng1 ng1 ng1 ng1 ng1 ng1 Angular 1 app

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Proposed migration scenario ng1 ng1 ng1 ng2 ng1 ng1

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Proposed migration scenario ng1 ng2 ng1 ng2 ng2 ng1

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Proposed migration scenario ng2 ng2 ng2 ng2 ng2 ng2 Angular 2 app

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ま よ た ね ぃ み む ょ じ を り ぉ ね ぼ り ぉ け ば や わ ゎ お ら ゆ ろ り ぉ け ば や わ ゎ お ら ゆ じ ゃ で り ぐ き な ゕ ゟ た ょ を こ で ぷ お じ ぁ だ ど ぬ す っ ら び ぅ ぬ だ ざ ま よ た ね ぃ み む ょ じ を り ぉ ね ぼ び ぃ ぅ や こ そ ぶ や あ ゝ ぼ ゆ ぺ み ひ じ え わ ぶ す ぞ ぷ ゑ っ ぞ ほ だ Show me the code already ま よ た ね ぃ み む ょ じ を り ぉ ね ぼ ろ り ぉ け ば や わ ゎ お ら ゆ ほ ぞ ぁ ろ り ぉ け ば や わ ゎ お び ぃ ぅ や こ そ ぶ や あ ゝ ぼ ゆ ぺ み ひ じ え わ ぶ す ぞ ぷ ゑ っ ぞ ほ だ ま よ た ね ぃ み む ょ じ を ろ り ぉ け ば や わ ゎ お ら ゆ ほ び ぃ ぅ や こ そ ぶ や あ ゝ ぼ ゆ ぺ み ひ じ え わ ぶ す ぞ ぷ ゑ っ ま よ た ね ぃ み む ょ じ を り ぉ ね ぼ ろ り ぉ け ば や わ ゎ お ら ゆ ほ ぞ ぁ ろ り ぉ け ば や わ ゎ び ぃ ぅ や こ そ ぶ や あ ゝ ぼ ゆ ぺ み ぶ す ぞ ぷ ゑ っ ぞ ほ だ り ぉ け ば や わ ゎ お ら ゆ ほ ぞ ぁ ろ り ぉ け ば や わ ゎ お ぉ け ば や わ ゎ お ら ゆ ほ ろ り ぉ け ば や わ ゎ お ら ゆ け ば や わ ゎ お ら ゆ ほ ぞ ぁ ろ り ぉ け ば や わ ゎ お ら ゆ を こ で ぷ お じ ぁ だ ど う え を こ で ぷ お じ ぁ だ ど う え ぬ す っ ら び ぅ ぬ だ ざ ぬ す っ ら び ぅ ぬ だ ざ ぬ す っ ら び ぅ ぬ だ ざ ぶ す ぞ ぷ ゑ っ ぞ ほ だ ゝ ぼ ゆ ぺ み あ ゝ ぼ ゆ ぺ み あ ゝ ぼ ゆ ぺ み あ ゝ ぼ ゆ ぺ み ぬ す っ ら び ぅ ぬ す っ ら び ぅ ぬ だ ざ ぬ す っ ら び ぅ ぬ だ ざ ぬ す っ ら び ぅ ぬ だ ざ ぬ す っ ら び ぅ ぬ あ ゝ ぼ ゆ ぺ み ゝ ぼ ゆ ぺ み ま よ た ね び ぃ ぅ や こ そ ぶ ま よ た ね ぃ み

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Angular 2.x import {ListComponent} from './list'; import {EditComponent} from './edit'; @Component({...}) @View({template: '...'}) @RouteConfig([ {path: '/', component: ListComponent}, {path: '/edit/:id', component: EditComponent} ]) class AppComponent() { ... }

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Angular 1.x $componentMapper .setCtrlNameMapping(comp => comp + 'Ctrl'); $componentMapper .setTemplateMapping(comp => comp + '.html'); AppController.$routeConfig([ {path: '/', component: 'list'}, {path: '/edit/:id', component: 'edit'} ]); function AppController() { ... }

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Static configuration {path: '/', component: 'list'}, {path: '/edit/:id', component: 'edit'} {path: '/', component: ListComponent}, {path: '/edit/:id', component: EditComponent} ng2 ng1 === easy to port

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Component Router Components Outlets Instructions Pipeline

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Component Router Components Outlets Instructions Pipeline

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So what’s a component anyway? Template Controller Router

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Template - ng2 @View({template: '...'}) @View({templateUrl: '...'})

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Template - ng1 $componentMapper .setTemplateMapping(function (compName) { return templatePath; }); ./components/my-comp/my-comp.html myComp Uses component convention by default: Customize as you want:

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“Controller” - ng2 class MyComp() {...}

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Controller - ng1 $componentMapper .setCtrlNameMapping(function (compName) { return controllerName; }); Adds “Controller” by default: Customize as you want: MyCompController myComp

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Router Each component can have a child router Child routers manage their sub-URLs

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You can release it as an artifact They can mount and use it SO,if you build an amazing component with deep linking

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Router - ng2 @RouteConfig([ {path: '/', redirectTo: '/main'}, {path: '/main', component: MainComp}, {path: '/other', components: {}, as: 'other'} ])

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Router - ng1 function MainController($router) { $router.config([...]); } function MainController() {...}; MainController.$routeConfig([...]);

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Component Router Components Outlets Instructions Pipeline

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Outlet - think ui-view
{path: '/', components: { default: 'posts', left: 'users' }}

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Component Router Components Outlets Instructions Pipeline

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Instruction Holds all the context for a transition: Outlets, path, parameters, ...

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Component Router Components Outlets Instructions Pipeline

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Pipeline - it’s middleware Takes Instruction Transforms it ..with side effects $setupRoutersStep $initLocalsStep $runCanDeactivateHookStep $runCanActivateHookStep $loadTemplatesStep $activateStep

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E.g.: pipeline in Angular 1.x $setupRoutersStep $initLocalsStep $runCanDeactivateHookStep $runCanActivateHookStep $loadTemplatesStep $activateStep Pipeline

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Let’s ask the router to go somewhere $setupRoutersStep $initLocalsStep $runCanDeactivateHookStep $runCanActivateHookStep $loadTemplatesStep $activateStep router.navigate('users/123')

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Router generates the instruction $setupRoutersStep $initLocalsStep $runCanDeactivateHookStep $runCanActivateHookStep $loadTemplatesStep $activateStep router.navigate('users/123') recognize(): instruction matchedUrl component router children: Instruction[]

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Once more unto the pipeline! $setupRoutersStep $initLocalsStep $runCanDeactivateHookStep $runCanActivateHookStep $loadTemplatesStep $activateStep matchedUrl component router children: Instruction[]

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$setupRoutersStep $setupRoutersStep $initLocalsStep $runCanDeactivateHookStep $runCanActivateHookStep $loadTemplatesStep $activateStep matchedUrl component router children: Instruction[] Add child instruction routers

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$initLocalsStep $setupRoutersStep $initLocalsStep $runCanDeactivateHookStep $runCanActivateHookStep $loadTemplatesStep $activateStep matchedUrl component router children: Instruction[] locals Add locals: $router, $routeParams

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$runCanDeactivateHookStep $setupRoutersStep $initLocalsStep $runCanDeactivateHookStep $runCanActivateHookStep $loadTemplatesStep $activateStep matchedUrl component router children: Instruction[] locals Visit old outlets; run canDeactivate()

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$runCanActivateHookStep $setupRoutersStep $initLocalsStep $runCanDeactivateHookStep $runCanActivateHookStep $loadTemplatesStep $activateStep matchedUrl component router children: Instruction[] locals Visit new outlets; run canActivate()

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$loadTemplatesStep $setupRoutersStep $initLocalsStep $runCanDeactivateHookStep $runCanActivateHookStep $loadTemplatesStep $activateStep matchedUrl component router children: Instruction[] locals template Load templates, add to instruction

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$activateStep $setupRoutersStep $initLocalsStep $runCanDeactivateHookStep $runCanActivateHookStep $loadTemplatesStep $activateStep matchedUrl component router children: Instruction[] locals template Recursively activate outlets (ctrl, tmpl, ...)

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Final step… Update $location: http://someHost/base/users/123 … and done!

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Pipeline - it’s customizable $setupRoutersStep $initLocalsStep $runCanDeactivateHookStep $runCanActivateHookStep $loadTemplatesStep $activateStep Up to you

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E.g.: let’s add resolve $setupRoutersStep $initLocalsStep $runCanDeactivateHookStep $runCanActivateHookStep $loadTemplatesStep $activateStep resolveStep

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Create our step factory .factory('resolveStep', function ($q, $injector) { return function resolve(instruction) { }; })

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Recurse over instructions .factory('resolveStep', function ($q, $injector) { return function resolve(instruction) { var promises = []; return instruction.router.traverseInstruction( instruction, queueResolves ).then(function () { return $q.all(promises); }); }; })

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Get config from instruction .factory('resolveStep', function ($q, $injector) { return function resolve(instruction) { var promises = []; function queueResolves(instruction) { var cfg = getResolveConfigFrom(instruction); } return instruction.router.traverseInstruction( instruction, queueResolves ).then(function () { return $q.all(promises); }); }; })

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Queue the resolution .factory('resolveStep', function ($q, $injector) { return function resolve(instruction) { var promises = []; function queueResolves(instruction) { var cfg = getResolveConfigFrom(instruction); var resolve = $q.when($injector.invoke(cfg.value)); promises.push(resolve.then(function (resolved) { })); } return instruction.router.traverseInstruction( instruction, queueResolves ).then(function () { return $q.all(promises); }); }; })

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Add it to locals .factory('resolveStep', function ($q, $injector) { return function resolve(instruction) { var promises = []; function queueResolves(instruction) { var cfg = getResolveConfigFrom(instruction); var resolve = $q.when($injector.invoke(cfg.value)); promises.push(resolve.then(function (resolved) { instruction.locals[cfg.key] = resolved; })); } return instruction.router.traverseInstruction( instruction, queueResolves ).then(function () { return $q.all(promises); }); }; })

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Insert it into the pipeline .config(function ($pipelineProvider) { var steps = $pipelineProvider.steps; var atPosition = steps.indexOf('$runCanDeactivateHookStep) + 1; //insert resolveStep after $runCanDeactivateHookStep steps.splice(atPosition, 0, 'resolveStep'); $pipelineProvider.config(steps); })

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End result $setupRoutersStep $initLocalsStep $runCanDeactivateHookStep $runCanActivateHookStep $loadTemplatesStep $activateStep resolveStep Part of the pipeline Called on every transition

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> implications Standardized extension Make it suit your app Publish and prosper

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Component Router Components Outlets Instructions Pipeline Other “stuff”

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Sticky components This is how it currently works Under consideration and desirable

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Dynamic loading Add new routes @ runtime: function SomeController($router) { $router.config([...]); }

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Recursive components Not sure how practical, but why not

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Migration

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ng1 + ngComponentRouter ng2 ng 1.5 + new router Some things we know

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And some we don’t ng1 + X ng1 + ngComponentRouter ng2 ng 1.5 + new router ?

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ngRoute is too simple to worry about

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Migration strategies from UI Router are a TODO item But one can dream…

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Multi-components are sort of like states $router.config([{ as: 'category', path: '/:category', components: { sidebar: 'Sidebar', content: 'Category' } }]); $stateProvider .state('category', { url: '/:category', views: { sidebar: { templateUrl: '...', controller: '...' }, content: { templateUrl: '...', controller: '...' } } }); ui-router compRouter

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Directives are sort of similar ~== ui-router compRouter

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What about what’s missing? Well…

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Pipeline! e.g. we saw how to add resolve we can fake $stateChangeEvents someone write an adapter? :)

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How can we prepare? Use similar conventions Component-like architecture Component-like file structure

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Write unit tests UI Router configuration is testable Write now, then verify migration later http://nikas.praninskas.com/test-ui-router Component Router should be even easier

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Current $state of affairs //TODO: draw something totally awesome like robots and lasers and stuff and maybe a cat

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Documentation!

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Read the source, Luke: github.com/angular/router

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github.com/angular/angular …no wait, now it’s:

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but only temporarily…

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Codebase is a bit of a mess: 1.x has not worked for over a month everything in ng2 repo until build is stable still working out core issues (i.e. reverse routing)

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When? Originally slated for 1.4

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…but probably not anymore: :(

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June-July? (my somewhat educated guess)

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In place of a summary Designed from the ground up; New ideas for the future; Lessons learned from the past; Not yet ready.

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Thank you! nikas.praninskas.com github/nikaspran @nikaspran