From 4208660a6f8f94bd1b6a18a3f71347d0270ccd5f Mon Sep 17 00:00:00 2001 From: Roman Hotsiy Date: Wed, 23 Nov 2016 01:23:32 +0200 Subject: [PATCH] Perfromance fix (tests still failing) --- .../JsonSchema/_json-schema-common.scss | 6 +- lib/components/JsonSchema/json-schema-lazy.ts | 5 +- lib/components/LoadingBar/loading-bar.ts | 49 ++++++ lib/components/Method/method.html | 26 +-- lib/components/Method/method.scss | 16 +- lib/components/Method/method.ts | 18 +- lib/components/MethodsList/methods-list.html | 4 +- lib/components/MethodsList/methods-list.scss | 5 + .../MethodsList/methods-list.spec.ts | 1 - lib/components/ParamsList/params-list.scss | 8 +- lib/components/Redoc/redoc.html | 4 + lib/components/Redoc/redoc.scss | 36 +++- lib/components/Redoc/redoc.ts | 28 +++- .../RequestSamples/request-samples.scss | 2 +- .../ResponsesSamples/responses-samples.scss | 2 +- .../SchemaSample/schema-sample.html | 4 +- .../SchemaSample/schema-sample.scss | 34 +--- lib/components/SideMenu/side-menu.html | 4 +- lib/components/index.ts | 7 +- lib/index.ts | 4 +- lib/redoc.module.ts | 6 +- lib/services/app-state.service.ts | 15 +- lib/services/hash.service.spec.ts | 3 +- lib/services/hash.service.ts | 2 +- lib/services/menu.service.spec.ts | 39 ++--- lib/services/menu.service.ts | 73 ++++++-- lib/services/schema-helper.service.ts | 15 +- lib/services/scroll.service.ts | 48 +++++- .../CopyButton/copy-button.directive.ts | 2 +- lib/shared/components/LazyFor/lazy-for.ts | 157 ++++++++++++++++++ .../StickySidebar/sticky-sidebar.ts | 2 +- lib/shared/components/Tabs/tabs.ts | 3 + lib/shared/components/Zippy/zippy.scss | 4 +- lib/shared/components/index.ts | 6 +- lib/shared/styles/_variables.scss | 2 +- lib/utils/helpers.ts | 4 + lib/utils/spec-manager.ts | 2 +- manual-types/index.d.ts | 7 + 38 files changed, 508 insertions(+), 145 deletions(-) create mode 100644 lib/components/LoadingBar/loading-bar.ts create mode 100644 lib/shared/components/LazyFor/lazy-for.ts diff --git a/lib/components/JsonSchema/_json-schema-common.scss b/lib/components/JsonSchema/_json-schema-common.scss index dcdf57bb..7a22f1e3 100644 --- a/lib/components/JsonSchema/_json-schema-common.scss +++ b/lib/components/JsonSchema/_json-schema-common.scss @@ -27,6 +27,10 @@ $sub-schema-offset: ($bullet-size / 2) + $bullet-margin; width: 75%; box-sizing: border-box; + + > div { + line-height: 1; + } } .param-range { @@ -41,7 +45,7 @@ $sub-schema-offset: ($bullet-size / 2) + $bullet-margin; } .param-description { - font-size: 13px; + //font-size: 14px; } .param-required { diff --git a/lib/components/JsonSchema/json-schema-lazy.ts b/lib/components/JsonSchema/json-schema-lazy.ts index 4cfe9143..2427b701 100644 --- a/lib/components/JsonSchema/json-schema-lazy.ts +++ b/lib/components/JsonSchema/json-schema-lazy.ts @@ -12,7 +12,8 @@ var cache = {}; @Component({ selector: 'json-schema-lazy', entryComponents: [ JsonSchema ], - template: '' + template: '', + styles: [':host { display:none }'] }) export class JsonSchemaLazy implements OnDestroy, AfterViewInit { @Input() pointer: string; @@ -66,7 +67,7 @@ export class JsonSchemaLazy implements OnDestroy, AfterViewInit { this._loadAfterSelf(); return; } - insertAfter($element.cloneNode(true), this.elementRef.nativeElement); + //insertAfter($element.cloneNode(true), this.elementRef.nativeElement); this.loaded = true; } else { cache[this.pointer] = this._loadAfterSelf(); diff --git a/lib/components/LoadingBar/loading-bar.ts b/lib/components/LoadingBar/loading-bar.ts new file mode 100644 index 00000000..8666deb7 --- /dev/null +++ b/lib/components/LoadingBar/loading-bar.ts @@ -0,0 +1,49 @@ +'use strict'; +import { Input, HostBinding, Component, OnInit, ChangeDetectionStrategy, ElementRef, ChangeDetectorRef } from '@angular/core'; +import JsonPointer from '../../utils/JsonPointer'; +import { BaseComponent, SpecManager } from '../base'; +import { SchemaHelper } from '../../services/schema-helper.service'; +import { OptionsService, AppStateService } from '../../services/'; + +@Component({ + selector: 'loading-bar', + template: ` + + `, + styles: [` + :host { + position: fixed; + top: 0; + left: 0; + right: 0; + display: block; + + height: 5px; + z-index: 100; + } + + span { + display: block; + position: absolute; + left: 0; + top: 0; + bottom: 0; + right: attr(progress percentage); + background-color: #5f7fc3; + transition: right 0.2s linear; + } + `], + //changeDetection: ChangeDetectionStrategy.OnPush +}) +export class LoadingBar { + @Input() progress:number = 0; + @HostBinding('style.display') display = 'block'; + + ngOnChanges(ch) { + if (ch.progress.currentValue === 100) { + setTimeout(() => { + this.display = 'none'; + }, 500); + } + } +} diff --git a/lib/components/Method/method.html b/lib/components/Method/method.html index 861ff11a..d9b1afe6 100644 --- a/lib/components/Method/method.html +++ b/lib/components/Method/method.html @@ -1,18 +1,18 @@ -
-
-

- {{method.summary}} -

-
- {{tag}} -
-

+

+
+

+ {{method.summary}} +

+
+ {{tag}} +
+

-
-
+
+

Definition

@@ -30,5 +30,5 @@
+
-
diff --git a/lib/components/Method/method.scss b/lib/components/Method/method.scss index 8d644a94..0306b61e 100644 --- a/lib/components/Method/method.scss +++ b/lib/components/Method/method.scss @@ -6,18 +6,20 @@ display: block; border-bottom: 1px solid rgba(127, 127, 127, 0.25); margin-top: 1em; + transform: translateZ(0); + z-index: 2; } -:host:last-of-type { - border-bottom: 0; -} +// :host:last-of-type { +// border-bottom: 0; +// } .method-header { - margin-bottom: .9em; + margin-bottom: calc(1em - 6px); } .method-endpoint { - margin: 0 0 2em 0; + //margin: 0 0 2px 0; padding: 10px 20px; border-radius: $border-radius*2; background-color: darken($black, 2%); @@ -31,8 +33,8 @@ padding-top: 1px; padding-bottom: 0; margin: 0; - font-size: .8em; - color: $black; + font-size: 12/14em; + color: $black; vertical-align: middle; display: inline-block; border-radius: $border-radius; diff --git a/lib/components/Method/method.ts b/lib/components/Method/method.ts index 80f23ce0..b846684f 100644 --- a/lib/components/Method/method.ts +++ b/lib/components/Method/method.ts @@ -1,9 +1,9 @@ 'use strict'; -import { Input, Component, OnInit, ChangeDetectionStrategy } from '@angular/core'; +import { Input, Component, OnInit, ChangeDetectionStrategy, ElementRef, ChangeDetectorRef } from '@angular/core'; import JsonPointer from '../../utils/JsonPointer'; import { BaseComponent, SpecManager } from '../base'; import { SchemaHelper } from '../../services/schema-helper.service'; -import { OptionsService } from '../../services/options.service'; +import { OptionsService, AppStateService } from '../../services/'; @Component({ selector: 'method', @@ -14,10 +14,14 @@ import { OptionsService } from '../../services/options.service'; export class Method extends BaseComponent implements OnInit { @Input() pointer:string; @Input() tag:string; + @Input() posInfo: any; + + hidden = true; method:any; - constructor(specMgr:SpecManager, private optionsService: OptionsService) { + constructor(specMgr:SpecManager, private optionsService: OptionsService, private chDetector: ChangeDetectorRef, + private appState: AppStateService, private el: ElementRef) { super(specMgr); } @@ -53,6 +57,14 @@ export class Method extends BaseComponent implements OnInit { return bodyParam; } + show(res) { + if (res) { + this.el.nativeElement.firstElementChild.removeAttribute('hidden'); + } else { + this.el.nativeElement.firstElementChild.setAttribute('hidden', 'hidden'); + } + } + ngOnInit() { this.preinit(); } diff --git a/lib/components/MethodsList/methods-list.html b/lib/components/MethodsList/methods-list.html index 11f4f859..225a1930 100644 --- a/lib/components/MethodsList/methods-list.html +++ b/lib/components/MethodsList/methods-list.html @@ -1,10 +1,10 @@
-
+

{{tag.name}}

-
diff --git a/lib/components/MethodsList/methods-list.scss b/lib/components/MethodsList/methods-list.scss index 0cfbfa50..fe57d8c2 100644 --- a/lib/components/MethodsList/methods-list.scss +++ b/lib/components/MethodsList/methods-list.scss @@ -4,6 +4,11 @@ display: block; overflow: hidden; } + +:host [hidden] { + display: none; +} + .tag-info { padding: $section-spacing; box-sizing: border-box; diff --git a/lib/components/MethodsList/methods-list.spec.ts b/lib/components/MethodsList/methods-list.spec.ts index ca59e157..69a7afda 100644 --- a/lib/components/MethodsList/methods-list.spec.ts +++ b/lib/components/MethodsList/methods-list.spec.ts @@ -23,7 +23,6 @@ describe('Redoc components', () => { let fixture; beforeEach(async(inject([SpecManager], ( specMgr) => { - return specMgr.load('/tests/schemas/methods-list-component.json'); }))); beforeEach(() => { diff --git a/lib/components/ParamsList/params-list.scss b/lib/components/ParamsList/params-list.scss index 239c8c83..70123065 100644 --- a/lib/components/ParamsList/params-list.scss +++ b/lib/components/ParamsList/params-list.scss @@ -2,10 +2,14 @@ $hint-color: #999999; +:host { + display: block; +} + .param-list-header { border-bottom: 1px solid rgba($text-color, .3); - padding: 0.2em 0; - margin: 3.5em 0 .8em 0; +// padding: 0.2em 0; + margin: 3em 0 1em 0; color: rgba($text-color, .5); font-weight: normal; text-transform: uppercase; diff --git a/lib/components/Redoc/redoc.html b/lib/components/Redoc/redoc.html index 89bacc5c..b0e66acd 100644 --- a/lib/components/Redoc/redoc.html +++ b/lib/components/Redoc/redoc.html @@ -3,6 +3,10 @@
{{error.message}}
+ +
+
+
diff --git a/lib/components/Redoc/redoc.scss b/lib/components/Redoc/redoc.scss index cb9833f2..6ba0eef0 100644 --- a/lib/components/Redoc/redoc.scss +++ b/lib/components/Redoc/redoc.scss @@ -36,11 +36,17 @@ color: $text-color; } +.menu-content { + overflow: hidden; +} + [sticky-sidebar] { width: $side-bar-width; background-color: $side-bar-bg-color; overflow-y: auto; overflow-x: hidden; + transform: translateZ(0); + z-index: 75; @media (max-width: $side-menu-mobile-breakpoint) { z-index: 1; @@ -51,22 +57,33 @@ .api-content { margin-left: $side-bar-width; + z-index: 50; position: relative; + // height: 100vh; + // overflow: scroll; + top: 0; @media (max-width: $side-menu-mobile-breakpoint) { padding-top: 3em; margin-left: 0; } } -.api-content:before { - content: ""; - background: $samples-panel-bg-color; - height: 100%; - width: $samples-panel-width; +.background { + position: fixed; top: 0; + bottom: 0; right: 0; - position: absolute; - z-index: -1; + left: $side-bar-width; + z-index: 1; + + &-actual { + background: $samples-panel-bg-color; + left: 100% - $samples-panel-width; + right: 0; + top: 0; + bottom: 0; + position: absolute; + } @media (max-width: $right-panel-squash-breakpoint) { display: none; @@ -98,7 +115,8 @@ font-family: $headers-font, $headers-font-family; color: $secondary-color; font-weight: $headers-font-weight; - line-height: 1.4em; + line-height: 1.5; + margin-bottom: 0.5em; } } @@ -107,7 +125,7 @@ h2 { font-size: $h2; } h3 { font-size: $h3; } h4 { font-size: $h4; } - h5 { font-size: $h5; } + h5 { font-size: $h5; line-height: 20px; } p { font-family: $base-font, $base-font-family; diff --git a/lib/components/Redoc/redoc.ts b/lib/components/Redoc/redoc.ts index 56f72601..35bf9d50 100644 --- a/lib/components/Redoc/redoc.ts +++ b/lib/components/Redoc/redoc.ts @@ -17,13 +17,14 @@ import * as detectScollParent from 'scrollparent'; import { SpecManager } from '../../utils/spec-manager'; import { OptionsService, Hash, MenuService, AppStateService } from '../../services/index'; +import { LazyTasksService } from '../../shared/components/LazyFor/lazy-for'; import { CustomErrorHandler } from '../../utils/'; @Component({ selector: 'redoc', templateUrl: './redoc.html', styleUrls: ['./redoc.css'], - changeDetection: ChangeDetectionStrategy.OnPush + //changeDetection: ChangeDetectionStrategy.OnPush }) export class Redoc extends BaseComponent implements OnInit { static _preOptions: any; @@ -34,6 +35,8 @@ export class Redoc extends BaseComponent implements OnInit { specLoaded: boolean; options: any; + loadingProgress: number; + @Input() specUrl: string; @HostBinding('class.loading') specLoading: boolean = false; @HostBinding('class.loading-remove') specLoadingRemove: boolean = false; @@ -43,7 +46,9 @@ export class Redoc extends BaseComponent implements OnInit { optionsMgr: OptionsService, elementRef: ElementRef, private changeDetector: ChangeDetectorRef, - private appState: AppStateService + private appState: AppStateService, + private lazyTasksService: LazyTasksService, + private hash: Hash ) { super(specMgr); // merge options passed before init @@ -66,24 +71,37 @@ export class Redoc extends BaseComponent implements OnInit { }, 400); } + showLoadingAnimation() { + this.specLoading = true; + this.specLoadingRemove = false; + } + load() { this.specMgr.load(this.options.specUrl).catch(err => { throw err; }); + this.appState.loading.subscribe(loading => { + if (loading) { + this.showLoadingAnimation(); + } else { + this.hideLoadingAnimation(); + } + }); + this.specMgr.spec.subscribe((spec) => { if (!spec) { - this.specLoading = true; - this.specLoaded = false; + this.appState.startLoading(); } else { this.specLoaded = true; - this.hideLoadingAnimation(); this.changeDetector.markForCheck(); + this.changeDetector.detectChanges(); } }); } ngOnInit() { + this.lazyTasksService.loadProgress.subscribe(progress => this.loadingProgress = progress) this.appState.error.subscribe(_err => { if (!_err) return; diff --git a/lib/components/RequestSamples/request-samples.scss b/lib/components/RequestSamples/request-samples.scss index ab4a227f..100e5b34 100644 --- a/lib/components/RequestSamples/request-samples.scss +++ b/lib/components/RequestSamples/request-samples.scss @@ -53,7 +53,7 @@ header { border-radius: $border-radius; margin: 2px 0; padding: 3px 10px 2px 10px; - line-height: 1.25; + line-height: 16px; color: $sample-panel-headers-color; &:hover { diff --git a/lib/components/ResponsesSamples/responses-samples.scss b/lib/components/ResponsesSamples/responses-samples.scss index db0f4f24..e6191dfc 100644 --- a/lib/components/ResponsesSamples/responses-samples.scss +++ b/lib/components/ResponsesSamples/responses-samples.scss @@ -22,7 +22,7 @@ header { margin: 2px 0; padding: 2px 8px 3px 8px; color: $sample-panel-headers-color; - line-height: 1.25; + line-height: 16px; &:hover { color: #ffffff; diff --git a/lib/components/SchemaSample/schema-sample.html b/lib/components/SchemaSample/schema-sample.html index 08aa9a57..a1a3ec8a 100644 --- a/lib/components/SchemaSample/schema-sample.html +++ b/lib/components/SchemaSample/schema-sample.html @@ -2,9 +2,9 @@ 
 Sample unavailable
- Collapse all + Copy Expand all - Copy + Collapse all 

 

diff --git a/lib/components/SchemaSample/schema-sample.scss b/lib/components/SchemaSample/schema-sample.scss
index 714eac34..51abcc79 100644
--- a/lib/components/SchemaSample/schema-sample.scss
+++ b/lib/components/SchemaSample/schema-sample.scss
@@ -13,46 +13,25 @@ pre {
 }
 
 .action-buttons {
-  display: block;
   opacity: 0;
   transition: opacity 0.3s ease;
   transform: translateY(100%);
-  z-index: 1;
+  z-index: 3;
   position: relative;
-
-  > span {
-    float: right;
-
-    &:last-child > a:before {
-      display: none;
-    }
-  }
+  height: 2em;
+  line-height: 2em;
+  padding-right: 10px;
+  text-align: right;
 
   > span > a {
     padding: 2px 10px;
     color: #ffffff;
     cursor: pointer;
 
-    &:before {
-      content: '|';
-      display: inline-block;
-      transform: translateX(-10px);
-    }
-
-    &:first-child {
-      margin-right: 0;
-    }
-
     &:hover {
-      background-color: $black;
+      background-color: lighten($black, 15%);
     }
   }
-
-  &:after {
-    display: block;
-    content: '';
-    clear: both;
-  }
 }
 
 .snippet:hover .action-buttons {
@@ -135,6 +114,7 @@ pre {
 
   li {
   	position: relative;
+    display: block;
   }
 
   .hoverable {
diff --git a/lib/components/SideMenu/side-menu.html b/lib/components/SideMenu/side-menu.html
index 72f569c8..b6c92220 100644
--- a/lib/components/SideMenu/side-menu.html
+++ b/lib/components/SideMenu/side-menu.html
@@ -10,10 +10,10 @@
   

 
     
+    [ngClass]="{active: cat.active, disabled: !cat.ready}"> {{cat.name}}
     
    
       
  • 
         {{method.summary}}
       
    • 
diff --git a/lib/components/index.ts b/lib/components/index.ts
index e904bc5a..ed445ecb 100644
--- a/lib/components/index.ts
+++ b/lib/components/index.ts
@@ -14,13 +14,16 @@ import { MethodsList } from './MethodsList/methods-list';
 import { Method } from './Method/method';
 import { Warnings } from './Warnings/warnings';
 import { SecurityDefinitions } from './SecurityDefinitions/security-definitions';
+import { LoadingBar } from './LoadingBar/loading-bar';
 
 import { Redoc } from './Redoc/redoc';
 
 export const REDOC_DIRECTIVES = [
   ApiInfo, ApiLogo, JsonSchema, JsonSchemaLazy, ParamsList, RequestSamples, ResponsesList,
-  ResponsesSamples, SchemaSample, SideMenu, MethodsList, Method, Warnings, Redoc, SecurityDefinitions
+  ResponsesSamples, SchemaSample, SideMenu, MethodsList, Method, Warnings, Redoc, SecurityDefinitions,
+  LoadingBar
 ];
 
 export { ApiInfo, ApiLogo, JsonSchema, JsonSchemaLazy, ParamsList, RequestSamples, ResponsesList,
-ResponsesSamples, SchemaSample, SideMenu, MethodsList, Method, Warnings, Redoc, SecurityDefinitions }
+ResponsesSamples, SchemaSample, SideMenu, MethodsList, Method, Warnings, Redoc, SecurityDefinitions,
+LoadingBar }
diff --git a/lib/index.ts b/lib/index.ts
index 32a05be6..9ce607ad 100644
--- a/lib/index.ts
+++ b/lib/index.ts
@@ -14,10 +14,10 @@ if (AOT) {
   bootstrapRedoc = require('./bootstrap.dev').bootstrapRedoc;
 }
 
-if (IS_PRODUCTION) {
+//if (IS_PRODUCTION) {
   disableDebugTools();
   enableProdMode();
-}
+//}
 
 export const version = LIB_VERSION;
 
diff --git a/lib/redoc.module.ts b/lib/redoc.module.ts
index 16a1cf41..7244cfb6 100644
--- a/lib/redoc.module.ts
+++ b/lib/redoc.module.ts
@@ -1,10 +1,11 @@
 import { NgModule, ErrorHandler } from '@angular/core';
 import { CommonModule } from '@angular/common';
 
-import { Redoc, SecurityDefinitions, REDOC_DIRECTIVES } from './components/index';
+import { Redoc, SecurityDefinitions, Method, REDOC_DIRECTIVES } from './components/index';
 import { REDOC_COMMON_DIRECTIVES, DynamicNg2Wrapper } from './shared/components/index';
 import { REDOC_PIPES, KeysPipe } from './utils/pipes';
 import { CustomErrorHandler } from './utils/'
+import { LazyTasksService } from './shared/components/LazyFor/lazy-for';
 
 import {
   OptionsService,
@@ -22,7 +23,7 @@ import { SpecManager } from './utils/spec-manager';
   imports: [ CommonModule ],
   declarations: [ REDOC_DIRECTIVES, REDOC_COMMON_DIRECTIVES, REDOC_PIPES ],
   bootstrap: [ Redoc ],
-  entryComponents: [ SecurityDefinitions, DynamicNg2Wrapper ],
+  entryComponents: [ SecurityDefinitions, DynamicNg2Wrapper, Method ],
   providers: [
     SpecManager,
     ScrollService,
@@ -33,6 +34,7 @@ import { SpecManager } from './utils/spec-manager';
     AppStateService,
     ComponentParser,
     ContentProjector,
+    LazyTasksService,
     { provide: ErrorHandler, useClass: CustomErrorHandler },
     { provide: COMPONENT_PARSER_ALLOWED, useValue: { 'security-definitions': SecurityDefinitions} }
   ],
diff --git a/lib/services/app-state.service.ts b/lib/services/app-state.service.ts
index bc63b5a1..4fc434a2 100644
--- a/lib/services/app-state.service.ts
+++ b/lib/services/app-state.service.ts
@@ -1,11 +1,24 @@
 'use strict';
 
-import { Injectable } from '@angular/core';
+import { Injectable, NgZone } from '@angular/core';
 import { Subject } from 'rxjs/Subject';
 import { BehaviorSubject } from 'rxjs/BehaviorSubject';
+import { Injector } from '@angular/core';
 
 @Injectable()
 export class AppStateService {
   samplesLanguage = new Subject();
   error = new BehaviorSubject(null);
+  loading = new Subject();
+
+  startLoading() {
+    this.loading.next(true);
+  }
+
+  stopLoading() {
+    this.loading.next(false);
+  }
+
+  constructor(private injector: Injector, private zone: NgZone) {
+  }
 }
diff --git a/lib/services/hash.service.spec.ts b/lib/services/hash.service.spec.ts
index 9d959eba..0671ff57 100644
--- a/lib/services/hash.service.spec.ts
+++ b/lib/services/hash.service.spec.ts
@@ -13,10 +13,11 @@ describe('Hash Service', () => {
   beforeEach(inject([Hash], (_hash) => hashService = _hash));
 
   it('should trigger changed event after ReDoc bootstrapped', (done) => {
-    spyOn(hashService.value, 'next').and.callThrough();
+    spyOn(hashService.value, 'next').and.stub();
     specMgr.spec.next({});
     setTimeout(() => {
       expect(hashService.value.next).toHaveBeenCalled();
+      hashService.value.next.and.callThrough();
       done();
     });
   });
diff --git a/lib/services/hash.service.ts b/lib/services/hash.service.ts
index e24f0b92..5e752fe4 100644
--- a/lib/services/hash.service.ts
+++ b/lib/services/hash.service.ts
@@ -7,7 +7,7 @@ import { SpecManager } from '../utils/spec-manager';
 
 @Injectable()
 export class Hash {
-  public value = new BehaviorSubject('');
+  public value = new BehaviorSubject(null);
   constructor(private specMgr: SpecManager, private location: PlatformLocation) {
     this.bind();
 
diff --git a/lib/services/menu.service.spec.ts b/lib/services/menu.service.spec.ts
index 7720b317..9eac14cd 100644
--- a/lib/services/menu.service.spec.ts
+++ b/lib/services/menu.service.spec.ts
@@ -8,7 +8,8 @@ import {
 
 import { MenuService } from './menu.service';
 import { Hash } from './hash.service';
-import { ScrollService } from './scroll.service';
+import { LazyTasksService } from '../shared/components/LazyFor/lazy-for';
+import { ScrollService,  } from './scroll.service';
 import { SpecManager } from '../utils/spec-manager';;
 
 describe('Menu service', () => {
@@ -16,42 +17,38 @@ describe('Menu service', () => {
     TestBed.configureTestingModule({ declarations: [ TestAppComponent ] });
   });
 
-  let menu, hashService, scroll;
-  let specMgr;
+  let menu, hashService, scroll, tasks;
+  let specMgr, appStateMock;
 
-  beforeEach(async(inject([SpecManager, Hash, ScrollService],
-  ( _specMgr, _hash, _scroll, _menu) => {
+  beforeEach(async(inject([SpecManager, Hash, ScrollService, LazyTasksService],
+  ( _specMgr, _hash, _scroll, _tasks) => {
     hashService = _hash;
     scroll = _scroll;
+    tasks = _tasks;
+
+    appStateMock = {
+      stopLoading: () => { /* */ },
+      startLoading: () => { /* */ }
+    };
 
     specMgr = _specMgr;
+    tasks.allSync = true;
     return specMgr.load('/tests/schemas/extended-petstore.yml');
   })));
 
   beforeEach(() => {
-    menu = new MenuService(hashService, scroll, specMgr);
+    menu = new MenuService(hashService, tasks, scroll, appStateMock, specMgr);
     let fixture = TestBed.createComponent(TestAppComponent);
     fixture.detectChanges();
   });
 
-  it('should run hashScroll when hash changed', (done) => {
-    spyOn(menu, 'hashScroll').and.callThrough();
-    hashService.value.subscribe((hash) => {
-      if (!hash) return;
-      expect(menu.hashScroll).toHaveBeenCalled();
-      menu.hashScroll.and.callThrough();
-      done();
-    });
-    hashService.value.next('nonFalsy');
-  });
-
   it('should scroll to method when location hash is present [jp]', (done) => {
     let hash = '#tag/pet/paths/~1pet~1findByStatus/get';
-    spyOn(menu, 'hashScroll').and.callThrough();
+    spyOn(menu, 'scrollToActive').and.callThrough();
     spyOn(window, 'scrollTo').and.stub();
     hashService.value.subscribe((hash) => {
       if (!hash) return;
-      expect(menu.hashScroll).toHaveBeenCalled();
+      expect(menu.scrollToActive).toHaveBeenCalled();
       let scrollY = (window.scrollTo).calls.argsFor(0)[1];
       expect(scrollY).toBeGreaterThan(0);
       (window.scrollTo).and.callThrough();
@@ -62,11 +59,11 @@ describe('Menu service', () => {
 
   it('should scroll to method when location hash is present [operation]', (done) => {
     let hash = '#operation/getPetById';
-    spyOn(menu, 'hashScroll').and.callThrough();
+    spyOn(menu, 'scrollToActive').and.callThrough();
     spyOn(window, 'scrollTo').and.stub();
     hashService.value.subscribe((hash) => {
       if (!hash) return;
-      expect(menu.hashScroll).toHaveBeenCalled();
+      expect(menu.scrollToActive).toHaveBeenCalled();
       let scrollY = (window.scrollTo).calls.argsFor(0)[1];
       expect(scrollY).toBeGreaterThan(0);
       done();
diff --git a/lib/services/menu.service.ts b/lib/services/menu.service.ts
index 3ce12357..3a703089 100644
--- a/lib/services/menu.service.ts
+++ b/lib/services/menu.service.ts
@@ -1,9 +1,12 @@
 'use strict';
 import { Injectable, EventEmitter } from '@angular/core';
+import { BehaviorSubject } from 'rxjs/BehaviorSubject';
 import { ScrollService, INVIEW_POSITION } from './scroll.service';
 import { Hash } from './hash.service';
 import { SpecManager } from '../utils/spec-manager';
 import { SchemaHelper, MenuCategory } from './schema-helper.service';
+import { AppStateService } from './app-state.service';
+import { LazyTasksService } from '../shared/components/LazyFor/lazy-for';
 
 const CHANGE = {
   NEXT : 1,
@@ -14,13 +17,19 @@ const CHANGE = {
 @Injectable()
 export class MenuService {
   changed: EventEmitter = new EventEmitter();
+  ready: BehaviorSubject = new BehaviorSubject(false);
   categories: Array;
 
   activeCatIdx: number = 0;
   activeMethodIdx: number = -1;
-  activeMethodPtr: string;
 
-  constructor(private hash:Hash, private scrollService:ScrollService, specMgr:SpecManager) {
+  constructor(
+    private hash:Hash,
+    private tasks: LazyTasksService,
+    private scrollService: ScrollService,
+    private appState: AppStateService,
+    specMgr:SpecManager
+  ) {
     this.hash = hash;
     this.categories = SchemaHelper.buildMenuTree(specMgr.schema);
 
@@ -30,11 +39,35 @@ export class MenuService {
 
     this.changeActive(CHANGE.INITIAL);
 
+    let initialScroll = true;
     this.hash.value.subscribe((hash) => {
-      this.hashScroll(hash);
+      if (hash == undefined) return;
+      this.setActiveByHash(hash);
+
+      if (!this.tasks.empty) {
+        this.tasks.start(this.activeCatIdx, this.activeMethodIdx);
+        this.scrollService.setStickElement(this.getCurrentMethodEl());
+        this.scrollToActive();
+        if (initialScroll) {
+          this.appState.stopLoading();
+          initialScroll = false;
+        }
+      } else {
+        this.scrollToActive();
+      }
     });
   }
 
+  get activeMethodPtr() {
+    let cat = this.categories[this.activeCatIdx];
+    let ptr = null;
+    if (cat && cat.methods.length) {
+      let mtd = cat.methods[this.activeMethodIdx];
+      ptr = mtd && mtd.pointer || null;
+    }
+    return ptr;
+  }
+
   scrollUpdate(isScrolledDown) {
     let stable = false;
     while(!stable) {
@@ -44,6 +77,7 @@ export class MenuService {
       if(isScrolledDown) {
         //&& elementInViewPos === INVIEW_POSITION.BELLOW
         let $nextEl = this.getRelativeCatOrItem(1);
+        if (!$nextEl) return;
         let nextInViewPos = this.scrollService.getElementPos($nextEl, true);
         if (elementInViewPos === INVIEW_POSITION.BELLOW && nextInViewPos === INVIEW_POSITION.ABOVE) {
           stable = this.changeActive(CHANGE.NEXT);
@@ -105,12 +139,10 @@ export class MenuService {
     this.activeCatIdx = catIdx;
     this.activeMethodIdx = methodIdx;
     menu[catIdx].active = true;
-    this.activeMethodPtr = null;
     let currentItem;
     if (menu[catIdx].methods.length && (methodIdx > -1)) {
       currentItem = menu[catIdx].methods[methodIdx];
       currentItem.active = true;
-      this.activeMethodPtr = currentItem.pointer;
     }
 
     this.changed.next({cat: menu[catIdx], item: currentItem});
@@ -156,24 +188,31 @@ export class MenuService {
     this.scrollService.scrollTo(this.getCurrentMethodEl());
   }
 
-  hashScroll(hash) {
-    if (!hash) return;
-
-    let $el;
+  setActiveByHash(hash) {
+    if (!hash) {
+      return;
+    }
+    let catIdx, methodIdx;
     hash = hash.substr(1);
     let namespace = hash.split('/')[0];
     let ptr = decodeURIComponent(hash.substr(namespace.length + 1));
-    if (namespace === 'operation') {
-      $el = this.getMethodElByOperId(ptr);
-    } else if (namespace === 'tag') {
+    if (namespace === 'section' || namespace === 'tag') {
       let sectionId = ptr.split('/')[0];
+      catIdx = this.categories.findIndex(cat => cat.id === namespace + '/' + sectionId);
+      let cat = this.categories[catIdx];
       ptr = ptr.substr(sectionId.length) || null;
-      sectionId = namespace + (sectionId ? '/' + sectionId : '');
-      $el = this.getMethodElByPtr(ptr, sectionId);
+      methodIdx = cat.methods.findIndex(method => method.pointer === ptr);
     } else {
-      $el = this.getMethodElByPtr(null, namespace + '/' + ptr);
+      catIdx = this.categories.findIndex(cat => {
+        if (!cat.methods.length) return false;
+        methodIdx = cat.methods.findIndex(method => method.operationId === ptr || method.pointer === ptr);
+        if (methodIdx >= 0) {
+          return true;
+        } else {
+          return false;
+        }
+      });
     }
-
-    if ($el) this.scrollService.scrollTo($el);
+    this.activate(catIdx, methodIdx);
   }
 }
diff --git a/lib/services/schema-helper.service.ts b/lib/services/schema-helper.service.ts
index 4f6ad0b3..c0c7d885 100644
--- a/lib/services/schema-helper.service.ts
+++ b/lib/services/schema-helper.service.ts
@@ -15,6 +15,7 @@ export interface MenuMethod {
   summary: string;
   tag: string;
   pointer: string;
+  operationId: string;
 }
 
 export interface MenuCategory {
@@ -291,13 +292,15 @@ export class SchemaHelper {
   }
 
   static buildMenuTree(schema):Array {
+    var catIdx = 0;
     let tag2MethodMapping = {};
 
     for (let header of (>(schema.info && schema.info['x-redoc-markdown-headers'] || []))) {
       let id = 'section/' + slugify(header);
       tag2MethodMapping[id] = {
-        name: header, id: id, virtual: true, methods: []
+        name: header, id: id, virtual: true, methods: [], idx: catIdx
       };
+      catIdx++;
     }
 
     for (let tag of schema.tags || []) {
@@ -309,7 +312,9 @@ export class SchemaHelper {
         headless: tag.name === '',
         empty: !!tag['x-traitTag'],
         methods: [],
+        idx: catIdx
       };
+      catIdx++;
     }
 
     let paths = schema.paths;
@@ -331,9 +336,11 @@ export class SchemaHelper {
             tagDetails = {
               name: tag,
               id: id,
-              headless: tag === ''
+              headless: tag === '',
+              idx: catIdx
             };
             tag2MethodMapping[id] = tagDetails;
+            catIdx++;
           }
           if (tagDetails.empty) continue;
           if (!tagDetails.methods) tagDetails.methods = [];
@@ -341,7 +348,9 @@ export class SchemaHelper {
             pointer: methodPointer,
             summary: methodSummary,
             operationId: methodInfo.operationId,
-            tag: tag
+            tag: tag,
+            idx: tagDetails.methods.length,
+            catIdx: tagDetails.idx
           });
         }
       }
diff --git a/lib/services/scroll.service.ts b/lib/services/scroll.service.ts
index 4134cce7..b264d311 100644
--- a/lib/services/scroll.service.ts
+++ b/lib/services/scroll.service.ts
@@ -1,5 +1,5 @@
 'use strict';
-import { Injectable, EventEmitter, Output } from '@angular/core';
+import { Injectable, EventEmitter } from '@angular/core';
 import { BrowserDomAdapter as DOM } from '../utils/browser-adapter';
 import { OptionsService } from './options.service';
 import { throttle } from '../utils/helpers';
@@ -14,14 +14,19 @@ export const INVIEW_POSITION = {
 export class ScrollService {
   scrollYOffset: any;
   $scrollParent: any;
-  @Output() scroll = new EventEmitter();
+  scroll = new EventEmitter();
   private prevOffsetY: number;
   private _cancel:any;
-  constructor(optionsService:OptionsService) {
+  private _savedPosition:number;
+  private _stickElement: HTMLElement;
+  constructor(private optionsService:OptionsService) {
     this.scrollYOffset = () => optionsService.options.scrollYOffset();
     this.$scrollParent = optionsService.options.$scrollParent;
     this.scroll = new EventEmitter();
     this.bind();
+    if ('scrollRestoration' in history) {
+      history.scrollRestoration = 'manual';
+    }
   }
 
   scrollY() {
@@ -42,20 +47,45 @@ export class ScrollService {
     return INVIEW_POSITION.INVIEW;
   }
 
-  scrollTo($el, offset:number = 0) {
-    // TODO: rewrite this to use offsetTop as more reliable solution
-    let subjRect = $el.getBoundingClientRect();
-    let posY = this.scrollY() + subjRect.top - this.scrollYOffset() + offset + 1;
+  scrollToPos(posY: number) {
     if (this.$scrollParent.scrollTo) {
-      this.$scrollParent.scrollTo(0, posY);
+      this.$scrollParent.scrollTo(0, Math.floor(posY));
     } else {
       this.$scrollParent.scrollTop = posY;
     }
   }
+  scrollTo($el, offset:number = 0) {
+    if (!$el) return;
+    // TODO: rewrite this to use offsetTop as more reliable solution
+    let subjRect = $el.getBoundingClientRect();
+    let posY = this.scrollY() + subjRect.top - this.scrollYOffset() + offset + 1;
+    this.scrollToPos(posY);
+    return posY;
+  }
+
+  saveScroll() {
+    let $el = this._stickElement;
+    if (!$el) return;
+    let offsetParent = $el.offsetParent;
+    this._savedPosition = $el.offsetTop + (offsetParent).offsetTop;
+  }
+
+  setStickElement($el) {
+    this._stickElement = $el;
+  }
+
+  restoreScroll() {
+    let $el = this._stickElement;
+    if (!$el) return;
+    let offsetParent = $el.offsetParent;
+    let currentPosition = $el.offsetTop + (offsetParent).offsetTop;
+    let newY = this.scrollY() + (currentPosition - this._savedPosition);
+    this.scrollToPos(newY);
+  }
 
   relativeScrollPos($el) {
     let subjRect = $el.getBoundingClientRect();
-    return - subjRect.top + this.scrollYOffset() - 1;
+    return -subjRect.top + this.scrollYOffset() - 1;
   }
 
   scrollHandler(evt) {
diff --git a/lib/shared/components/CopyButton/copy-button.directive.ts b/lib/shared/components/CopyButton/copy-button.directive.ts
index 9007fbe9..bf57bc1c 100644
--- a/lib/shared/components/CopyButton/copy-button.directive.ts
+++ b/lib/shared/components/CopyButton/copy-button.directive.ts
@@ -27,7 +27,7 @@ export class CopyButton implements OnInit {
   onClick() {
     let copied;
     if (this.copyText) {
-      copied = Clipboard.copyCustom(this.copyText);
+      copied = Clipboard.copyCustom(JSON.stringify(this.copyText));
     } else {
       copied = Clipboard.copyElement(this.copyElement);
     }
diff --git a/lib/shared/components/LazyFor/lazy-for.ts b/lib/shared/components/LazyFor/lazy-for.ts
new file mode 100644
index 00000000..89da6094
--- /dev/null
+++ b/lib/shared/components/LazyFor/lazy-for.ts
@@ -0,0 +1,157 @@
+'use strict';
+
+import {
+  Directive,
+  Input,
+  TemplateRef,
+  ChangeDetectorRef,
+  ViewContainerRef,
+  Injectable,
+  NgZone
+} from '@angular/core';
+
+import { BehaviorSubject } from 'rxjs/BehaviorSubject';
+
+import { ScrollService } from '../../../services/scroll.service';
+import { OptionsService } from '../../../services/options.service';
+
+import { isSafari } from '../../../utils/helpers';
+
+export class LazyForRow {
+  constructor(public $implicit: any, public index: number, public show: boolean) {}
+
+  get first(): boolean { return this.index === 0; }
+
+  get even(): boolean { return this.index % 2 === 0; }
+
+  get odd(): boolean { return !this.even; }
+}
+
+@Injectable()
+export class LazyTasksService {
+  private _tasks = [];
+  private _current: number = 0;
+  private _syncCount: number = 0;
+  public loadProgress = new BehaviorSubject(0);
+  public allSync = false;
+  constructor(public optionsService: OptionsService, private zone: NgZone) {
+  }
+
+  get empty() {
+    return this._current === this._tasks.length - 1;
+  }
+  set syncCount(n: number) {
+    this._syncCount = n;
+  }
+
+  addTasks(tasks:any[], callback:Function) {
+    tasks.forEach((task) => {
+      let taskCopy = Object.assign({_callback: callback}, task);
+      this._tasks.push(taskCopy);
+    });
+  }
+
+  nextTaskSync() {
+    this.zone.runOutsideAngular(() => {
+      let task = this._tasks[this._current];
+      if (!task) return;
+      task._callback(task.idx, true);
+      this._current++;
+      this.loadProgress.next(this._current / this._tasks.length * 100);
+    });
+  }
+
+  nextTask() {
+    requestAnimationFrame(() => {
+      let task = this._tasks[this._current];
+      if (!task) return;
+      task._callback(task.idx, false).then(() => {
+        this._current++;
+
+        setTimeout(()=> this.nextTask());
+        this.loadProgress.next(this._current / this._tasks.length * 100);
+      });
+    });
+  }
+
+  sortTasks(catIdx, metIdx) {
+    let idxMap = {};
+    this._tasks.forEach((task, idx) => {
+      idxMap[task.catIdx + '_' +  task.idx] = idx;
+    });
+    metIdx  = metIdx < 0 ? 0 : metIdx;
+    let destIdx = idxMap[catIdx + '_' + metIdx] || 0;
+    this._tasks.sort((a, b) => {
+      let aIdx = idxMap[a.catIdx + '_' +  a.idx];
+      let bIdx = idxMap[b.catIdx + '_' +  b.idx];
+      return Math.abs(aIdx - destIdx) - Math.abs(bIdx - destIdx);
+    })
+  }
+
+  start(catIdx, metIdx) {
+    let syncCount = 5;
+    // I know this is bad practice to detect browsers but there is an issue on Safari only
+    // http://stackoverflow.com/questions/40692365/maintaining-scroll-position-while-inserting-elements-above-glitching-only-in-sa
+    if (isSafari && this.optionsService.options.$scrollParent === window) {
+      syncCount = (metIdx >= 0) ?
+          this._tasks.findIndex(task => (task.catIdx === catIdx) && (task.idx === metIdx))
+        : this._tasks.findIndex(task => task.catIdx === catIdx);
+      syncCount += 1;
+    } else {
+      this.sortTasks(catIdx, metIdx);
+    }
+    if (this.allSync) syncCount = this._tasks.length;
+    for (var i=0; i < syncCount; i++) {
+      this.nextTaskSync();
+    }
+    this.nextTask();
+  }
+}
+
+
+@Directive({
+  selector: '[lazyFor][lazyForOf]'
+})
+export class LazyFor {
+  @Input() lazyForOf: any;
+
+  prevIdx = null;
+
+  private _viewRef;
+  constructor(
+    public _template: TemplateRef,
+    public cdr: ChangeDetectorRef,
+    public _viewContainer: ViewContainerRef,
+    public lazyTasks: LazyTasksService,
+    public scroll: ScrollService
+  ){
+  }
+
+  nextIteration(idx: number, sync: boolean):Promise {
+    const view = this._viewContainer.createEmbeddedView(
+                this._template, new LazyForRow(this.lazyForOf[idx], idx, sync), idx < this.prevIdx ? 0 : undefined);
+    this.prevIdx = idx;
+    view.context.index = idx;
+    (view as ChangeDetectorRef).markForCheck();
+    (view as ChangeDetectorRef).detectChanges();
+    if (sync) {
+      return Promise.resolve();
+    }
+    return new Promise((resolve, reject) => {
+      requestAnimationFrame(() => {
+        this.scroll.saveScroll();
+
+        view.context.show = true;
+        (view as ChangeDetectorRef).markForCheck();
+        (view as ChangeDetectorRef).detectChanges();
+
+        this.scroll.restoreScroll();
+        resolve();
+      });
+    });
+  }
+
+  ngOnInit() {
+    this.lazyTasks.addTasks(this.lazyForOf, this.nextIteration.bind(this))
+  }
+}
diff --git a/lib/shared/components/StickySidebar/sticky-sidebar.ts b/lib/shared/components/StickySidebar/sticky-sidebar.ts
index 5fb15a20..d9429e83 100644
--- a/lib/shared/components/StickySidebar/sticky-sidebar.ts
+++ b/lib/shared/components/StickySidebar/sticky-sidebar.ts
@@ -83,7 +83,7 @@ export class StickySidebar implements OnInit, OnDestroy {
     // FIXME use more reliable code
     this.$redocEl = this.$element.offsetParent.parentNode || DOM.defaultDoc().body;
     this.bind();
-    setTimeout(() => this.updatePosition());
+    requestAnimationFrame(() => this.updatePosition());
     //this.updatePosition()
   }
 
diff --git a/lib/shared/components/Tabs/tabs.ts b/lib/shared/components/Tabs/tabs.ts
index 1d1d1b66..deeea063 100644
--- a/lib/shared/components/Tabs/tabs.ts
+++ b/lib/shared/components/Tabs/tabs.ts
@@ -69,6 +69,9 @@ export class Tabs implements OnInit {
     

   `,
   styles: [`
+    :host {
+      display: block;
+    }
     .tab-wrap {
       display: none;
     }
diff --git a/lib/shared/components/Zippy/zippy.scss b/lib/shared/components/Zippy/zippy.scss
index a93ab00b..a72b7ef9 100644
--- a/lib/shared/components/Zippy/zippy.scss
+++ b/lib/shared/components/Zippy/zippy.scss
@@ -12,8 +12,8 @@ $zippy-redirect-bg-color: rgba($zippy-redirect-color, .08);
 
 :host {
   // performance optimization
-  transform: translate3d(0, 0, 0);
-  backface-visibility: hidden;
+  // transform: translate3d(0, 0, 0);
+  // backface-visibility: hidden;
   overflow: hidden;
   display: block;
 }
diff --git a/lib/shared/components/index.ts b/lib/shared/components/index.ts
index b273f1a5..5659b6f5 100644
--- a/lib/shared/components/index.ts
+++ b/lib/shared/components/index.ts
@@ -6,9 +6,11 @@ import { Zippy } from './Zippy/zippy';
 import { CopyButton } from './CopyButton/copy-button.directive';
 import { SelectOnClick } from './SelectOnClick/select-on-click.directive';
 import { DynamicNg2Viewer, DynamicNg2Wrapper } from './DynamicNg2Viewer/dynamic-ng2-viewer.component';
+import { LazyFor, LazyTasksService } from './LazyFor/lazy-for';
 
 export const REDOC_COMMON_DIRECTIVES = [
-  DropDown, StickySidebar, Tabs, Tab, Zippy, CopyButton, SelectOnClick, DynamicNg2Viewer, DynamicNg2Wrapper
+  DropDown, StickySidebar, Tabs, Tab, Zippy, CopyButton, SelectOnClick, DynamicNg2Viewer, DynamicNg2Wrapper, LazyFor
 ];
 
-export { DropDown, StickySidebar, Tabs, Tab, Zippy, CopyButton, SelectOnClick, DynamicNg2Viewer, DynamicNg2Wrapper }
+export { DropDown, StickySidebar, Tabs, Tab, Zippy, CopyButton, SelectOnClick, DynamicNg2Viewer, DynamicNg2Wrapper, LazyFor }
+export { LazyTasksService }
diff --git a/lib/shared/styles/_variables.scss b/lib/shared/styles/_variables.scss
index 95ff58d8..e31b8a65 100644
--- a/lib/shared/styles/_variables.scss
+++ b/lib/shared/styles/_variables.scss
@@ -22,7 +22,7 @@ $base-font: Roboto;
 $base-font-family: sans-serif;
 $base-font-weight: $light;
 $base-font-size: 1em;
-$base-line-height: 1.55em;
+$base-line-height: 1.5em;
 $text-color: $black;
 
 // Heading Font
diff --git a/lib/utils/helpers.ts b/lib/utils/helpers.ts
index 46f1ed66..4366388e 100644
--- a/lib/utils/helpers.ts
+++ b/lib/utils/helpers.ts
@@ -74,3 +74,7 @@ export function throttle(fn, threshhold, scope) {
     }
   };
 }
+
+export const isSafari = Object.prototype.toString.call(window.HTMLElement).indexOf('Constructor') > 0
+  || (function (p) { return p.toString() === '[object SafariRemoteNotification]'; })(!window['safari']
+  || safari.pushNotification);
diff --git a/lib/utils/spec-manager.ts b/lib/utils/spec-manager.ts
index 5a464de7..9e79e675 100644
--- a/lib/utils/spec-manager.ts
+++ b/lib/utils/spec-manager.ts
@@ -41,8 +41,8 @@ export class SpecManager {
         this._schema = schema;
         try {
           this.init();
-          resolve(this._schema);
           this.spec.next(this._schema);
+          resolve(this._schema);
         } catch(err) {
           reject(err);
         }
diff --git a/manual-types/index.d.ts b/manual-types/index.d.ts
index faecbd1c..8d37c8e6 100644
--- a/manual-types/index.d.ts
+++ b/manual-types/index.d.ts
@@ -19,4 +19,11 @@ declare var AOT: any;
 interface ErrorStackTraceLimit {
   stackTraceLimit: number;
 }
+interface History {
+  scrollRestoration: "auto"|"manual";
+}
+interface Window {
+  HTMLElement: any
+}
+declare var safari: any;
 interface ErrorConstructor extends ErrorStackTraceLimit {}