{"id":38838,"date":"2022-11-21T02:21:38","date_gmt":"2022-11-06T06:19:47","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/angular-v17%e5%b8%a6%e6%9d%a5%e4%ba%86%e6%96%b0%e7%9a%84%e6%8e%a7%e5%88%b6%e6%b5%81%e8%af%ad%e6%b3%95%ef%bc%81%e6%88%91%e8%af%95%e4%ba%86%e4%b8%80%e4%b8%8b%e8%bf%81%e7%a7%bb%e5%91%bd%e4%bb%a4%e3%80%82\/"},"modified":"2024-04-29T01:44:28","modified_gmt":"2024-04-28T17:44:28","slug":"angular-v17%e5%b8%a6%e6%9d%a5%e4%ba%86%e6%96%b0%e7%9a%84%e6%8e%a7%e5%88%b6%e6%b5%81%e8%af%ad%e6%b3%95%ef%bc%81%e6%88%91%e8%af%95%e4%ba%86%e4%b8%80%e4%b8%8b%e8%bf%81%e7%a7%bb%e5%91%bd%e4%bb%a4%e3%80%82","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/angular-v17%e5%b8%a6%e6%9d%a5%e4%ba%86%e6%96%b0%e7%9a%84%e6%8e%a7%e5%88%b6%e6%b5%81%e8%af%ad%e6%b3%95%ef%bc%81%e6%88%91%e8%af%95%e4%ba%86%e4%b8%80%e4%b8%8b%e8%bf%81%e7%a7%bb%e5%91%bd%e4%bb%a4%e3%80%82\/","title":{"rendered":"Angular v17\u5e26\u6765\u4e86\u65b0\u7684\u63a7\u5236\u6d41\u8bed\u6cd5\uff01\u6211\u8bd5\u4e86\u4e00\u4e0b\u8fc1\u79fb\u547d\u4ee4"},"content":{"rendered":"

\u8fd9\u7bc7\u6587\u7ae0\u662f Angular Advent Calender 2023 \u7b2c6\u5929\u7684\u6587\u7ae0\u3002
\n\u7b2c5\u5929\u7684\u6587\u7ae0\u662frch850\u5148\u751f\u4f7f\u7528Angular 17\u7684View Transitions API\u8fdb\u884c\u73a9\u800d\u3002<\/p>\n

Angular v17\u5e26\u6765\u4e86\u65b0\u7684\u63a7\u5236\u6d41\u8bed\u6cd5\uff01<\/h2>\n

\u5728\u8fc7\u53bb\u7684Angular\u7248\u672c\u4e2d\uff0c\u4f5c\u4e3a\u6a21\u677f\u529f\u80fd\u7684\u201c\u5206\u652f\u201d\u548c\u201c\u5faa\u73af\u201d\u662f\u901a\u8fc7\u7ed3\u6784\u578b\u6307\u4ee4\uff08ngIf\u3001ngFor\u3001ngSwitch\uff09\u6765\u5b9e\u73b0\u7684\u3002<\/p>\n

\u4ece Angular v17 \u5f00\u59cb\uff0c\u5c06\u65b0\u589e\u63a7\u5236\u6d41\u8bed\u6cd5 @if\u3001@for \u548c @switch\uff0c\u65e7\u6709\u7684\u7ed3\u6784\u578b\u6307\u4ee4\u53ef\u4ee5\u5168\u90e8\u66ff\u6362\u4e3a\u65b0\u7684\u63a7\u5236\u6d41\u8bed\u6cd5\u3002<\/p>\n

\u53ea\u9700\u8981\u4e00\u79cd\u9009\u9879\uff1a
\n\u8be6\u7ec6\u4fe1\u606f\u53ef\u53c2\u9605\u5b98\u65b9\u6587\u4ef6\u6216\u8005<\/p>\n

 <\/p>\n

\u5982\u679c\u4f60\u80fd\u9605\u8bfbAngular Advent Calender 2023\u7b2c\u4e8c\u5929\u7684\u6587\u7ae0\uff0c\u4e86\u89e3carimatics\u5173\u4e8e\u5f15\u5165\u5d4c\u5165\u5f0f\u63a7\u5236\u6d41\u4ee5\u53ca\u5176\u80cc\u666f\u7684\u8d21\u732e\uff0c\u90a3\u4e48\u4f60\u4e5f\u80fd\u7406\u89e3\u6211\u7684\u52a8\u673a\uff0c\u5e76\u4e14\u4f1a\u5f88\u597d\u3002<\/p>\n

\u5c06\u8fc1\u79fb\u547d\u4ee4\u91cd\u5199\u4e3a\u65b0\u7684\u63a7\u5236\u6d41\u8bed\u6cd5<\/h2>\n

Angular\u56e2\u961f\u5df2\u7ecf\u51c6\u5907\u4e86\u4e00\u4e2a\u8fc1\u79fb\u547d\u4ee4\uff0c\u7528\u4e8e\u5c06\u73b0\u6709\u7684\u7ed3\u6784\u6027\u6307\u4ee4\u8f6c\u6362\u4e3a\u65b0\u7684\u63a7\u5236\u6d41\u7a0b\u8bed\u6cd5\u3002<\/p>\n

ng generate @angular\/core:control-flow\r\n<\/code><\/pre>\n
\u8fd9\u4e2a\u547d\u4ee4\u771f\u65b9\u4fbf\uff0c\u4e00\u952e\u641e\u5b9a\uff01<\/p>\n
\u6211\u4eec\u7acb\u523b\u6765\u8bd5\u4e00\u8bd5\u5427\u3002\u4ee5\u4ee5\u4e0b\u5b9e\u65bd\u4e3a\u4f8b\uff0c<\/p>\n
<ng-container<\/span> *ngIf=<\/span>\"greeting\"<\/span>><\/span>\r\n  <span><\/span>hello<\/span><\/span>\r\n<\/ng-container><\/span>\r\n<ng-container<\/span> *ngFor=<\/span>\"let number of numbers\"<\/span>><\/span>\r\n  <span><\/span>{{ number }}<\/span><\/span>\r\n<\/ng-container><\/span>\r\n<ng-container<\/span> [ngSwitch]=<\/span>\"num\"<\/span>><\/span>\r\n  <span<\/span> *ngSwitchCase=<\/span>\"1\"<\/span>><\/span>one<\/span><\/span>\r\n  <span<\/span> *ngSwitchCase=<\/span>\"2\"<\/span>><\/span>two<\/span><\/span>\r\n  <span<\/span> *ngSwitchCase=<\/span>\"3\"<\/span>><\/span>three<\/span><\/span>\r\n<\/ng-container><\/span>\r\n<\/code><\/pre>\n
import<\/span> {<\/span> Component<\/span> }<\/span> from<\/span> '<\/span>@angular\/core<\/span>'<\/span>;<\/span>\r\nimport<\/span> {<\/span> CommonModule<\/span> }<\/span> from<\/span> '<\/span>@angular\/common<\/span>'<\/span>;<\/span>\r\nimport<\/span> {<\/span> RouterOutlet<\/span> }<\/span> from<\/span> '<\/span>@angular\/router<\/span>'<\/span>;<\/span>\r\n\r\n@<\/span>Component<\/span>({<\/span>\r\n  selector<\/span>:<\/span> '<\/span>app-root<\/span>'<\/span>,<\/span>\r\n  standalone<\/span>:<\/span> true<\/span>,<\/span>\r\n  imports<\/span>:<\/span> [<\/span>CommonModule<\/span>,<\/span> RouterOutlet<\/span>],<\/span>\r\n  templateUrl<\/span>:<\/span> '<\/span>.\/app.component.html<\/span>'<\/span>,<\/span>\r\n  styleUrl<\/span>:<\/span> '<\/span>.\/app.component.scss<\/span>'<\/span>\r\n})<\/span>\r\nexport<\/span> class<\/span> AppComponent<\/span> {<\/span>\r\n  greeting<\/span>:<\/span> boolean<\/span> =<\/span> true<\/span>;<\/span>\r\n  numbers<\/span>:<\/span> number<\/span>[]<\/span> =<\/span> [<\/span>1<\/span>,<\/span>2<\/span>,<\/span>3<\/span>,<\/span>4<\/span>,<\/span>5<\/span>];<\/span>\r\n  num<\/span>:<\/span> number<\/span> =<\/span> 2<\/span>;<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u6267\u884c\u547d\u4ee4\u3002<\/p>\n
$ ng generate @angular\/core:control-flow\r\n? Which path in your project should be migrated? .\/\r\n? Should the migration reformat your templates? Yes\r\n    IMPORTANT! This migration is in developer preview. Use with caution.\r\nUPDATE src\/app\/app.component.html (248 bytes)\r\nUPDATE src\/app\/app.component.ts (366 bytes)\r\n<\/code><\/pre>\n
\u60a8\u53ef\u4ee5\u5728\u5bf9\u8bdd\u6846\u4e2d\u6307\u5b9a\u8def\u5f84\u548c\u9009\u62e9\u91cd\u65b0\u683c\u5f0f\u5316\u3002\u5b9e\u9645\u7684\u5dee\u5f02\u5982\u4e0b\u6240\u793a\u3002<\/p>\n
$ git diff -w src\r\ndiff --git a\/src\/app\/app.component.html b\/src\/app\/app.component.html\r\nindex 781f3e5..2aef72f 100644\r\n<\/span>--- a\/src\/app\/app.component.html\r\n<\/span>+++ b\/src\/app\/app.component.html\r\n<\/span>@@ -1,11 +1,17 @@<\/span>\r\n-<ng-container *ngIf=\"greeting\">\r\n<\/span>+@if (greeting) {\r\n<\/span>   <span>hello<\/span>\r\n-<\/ng-container>\r\n-<ng-container *ngFor=\"let number of numbers\">\r\n<\/span>+}\r\n+@for (number of numbers; track number) {\r\n<\/span>   <span>{{ number }}<\/span>\r\n-<\/ng-container>\r\n-<ng-container [ngSwitch]=\"num\">\r\n-  <span *ngSwitchCase=\"1\">one<\/span>\r\n-  <span *ngSwitchCase=\"2\">two<\/span>\r\n-  <span *ngSwitchCase=\"3\">three<\/span>\r\n-<\/ng-container>\r\n<\/span>+}\r\n+@switch (num) {\r\n+  @case (1) {\r\n+    <span>one<\/span>\r\n+  }\r\n+  @case (2) {\r\n+    <span>two<\/span>\r\n+  }\r\n+  @case (3) {\r\n+    <span>three<\/span>\r\n+  }\r\n+}\r\n<\/span>diff --git a\/src\/app\/app.component.ts b\/src\/app\/app.component.ts\r\nindex 9a57e6b..4bfd92f 100644\r\n<\/span>--- a\/src\/app\/app.component.ts\r\n<\/span>+++ b\/src\/app\/app.component.ts\r\n<\/span>@@ -1,11 +1,11 @@<\/span>\r\n import { Component } from '@angular\/core';\r\n-import { CommonModule } from '@angular\/common';\r\n<\/span>+\r\n<\/span> import { RouterOutlet } from '@angular\/router';\r\n \r\n @Component({\r\n   selector: 'app-root',\r\n   standalone: true,\r\n-  imports: [CommonModule, RouterOutlet],\r\n<\/span>+  imports: [RouterOutlet],\r\n<\/span>   templateUrl: '.\/app.component.html',\r\n   styleUrl: '.\/app.component.scss'\r\n })\r\n<\/code><\/pre>\n
\u4f60\u5df2\u7ecf\u505a\u51fa\u5f88\u597d\u7684\u6539\u53d8\u4e86\u3002<\/p>\n
\u5bf9\u4e8e\u8981\u6c42\u4f7f\u7528 “@for” \u6307\u5b9a\u7684 track\uff0c\u5e94\u8be5\u76f4\u63a5\u6307\u5b9a\u5faa\u73af\u53d8\u91cf\u672c\u8eab\u3002\u8fd9\u91cc\u9700\u8981\u5bf9\u5176\u8fdb\u884c\u4fee\u6b63\uff0c\u4ee5\u786e\u4fdd\u6210\u4e3a\u552f\u4e00\u7684\u5c5e\u6027\u3002<\/p>\n
+@for (number of numbers; track number) {\r\n<\/span><\/code><\/pre>\n
\u6211\u4e5f\u6ce8\u610f\u5230\u4e86\u5c11\u4e86 CommonModule \u7684\u5f15\u7528\uff0c\u770b\u6765\u662f\u6709\u610f\u60f3\u8981\u51cf\u5c0f\u6587\u4ef6\u5927\u5c0f\u7684\u610f\u613f\u5462\u3002<\/p>\n
-  imports: [CommonModule, RouterOutlet],\r\n<\/span>+  imports: [RouterOutlet],\r\n<\/span><\/code><\/pre>\n
\u6211\u5c1d\u8bd5\u5728\u5b9e\u9645\u751f\u6d3b\u4e2d\u7684\u4e1a\u52a1\u4ee3\u7801\u4e2d\u8fdb\u884c\u6d4b\u8bd5\u3002<\/h2>\n
\u597d\u4e86\uff0c\u63a5\u4e0b\u6765\u8fdb\u5165\u6b63\u9898\u3002<\/p>\n
\u91cd\u8981\uff01\u6b64\u8fc1\u79fb\u6b63\u5728\u5f00\u53d1\u8005\u9884\u89c8\u4e2d\uff0c\u8bf7\u8c28\u614e\u4f7f\u7528\u3002<\/p><\/blockquote>\n
\u65e2\u7136\u5728\u6267\u884c\u65f6\u4f1a\u4ea7\u751f\u8fd9\u6837\u7684\u8f93\u51fa\uff0c\u6211\u4fbf\u5f88\u597d\u5947\u5728\u5b9e\u9645\u7684\u4e1a\u52a1\u4ee3\u7801\u4e2d\uff0c\u5b83\u80fd\u4ee5\u591a\u5927\u7684\u7cbe\u5ea6\u66ff\u4ee3\u3002\u8ba9\u6211\u4eec\u7acb\u5373\u8bd5\u4e00\u8bd5\u3002<\/p>\n
\u867d\u7136\u65e0\u6cd5\u516c\u5f00\u5177\u4f53\u4e1a\u52a1\u4ee3\u7801\uff0c\u4f46\u6211\u53ef\u4ee5\u5927\u81f4\u544a\u8bc9\u4f60\u5b83\u7684\u89c4\u6a21\u3002<\/p>\n
# \u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u6570<\/span>\r\ngrep<\/span> -r<\/span> '@Component'<\/span> src | wc<\/span> -l<\/span>\r\n     156\r\n\r\n# \u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u30d5\u30a1\u30a4\u30eb\u306e\u884c\u6570<\/span>\r\nfind src -name<\/span> \"*.html\"<\/span> -type<\/span> f | xargs cat<\/span> | wc<\/span> -l<\/span>\r\n   22403\r\n\r\n# ngIf\u306e\u7dcf\u6570<\/span>\r\ngrep<\/span> -r<\/span> '*ngIf'<\/span> src | wc<\/span> -l<\/span>\r\n     360\r\n\r\n# ngFor\u306e\u7dcf\u6570<\/span>\r\ngrep<\/span> -r<\/span> '*ngFor'<\/span> src | wc<\/span> -l<\/span>\r\n     106\r\n\r\n# ngSwitch\u306e\u7dcf\u6570<\/span>\r\ngrep<\/span> -r<\/span> 'ngSwitch'<\/span> src | wc<\/span> -l<\/span>\r\n      50\r\n<\/code><\/pre>\n
\u4ece\u7b2c\u4e00\u4e2a\u63d0\u4ea4\u5f00\u59cb\u5df2\u7ecf\u8fc7\u53bb\u4e86\u4e09\u5e74\u591a\uff0c\u73b0\u5728\u4ecd\u7136\u662f\u4e00\u4e2a\u7ecf\u9a8c\u4e30\u5bcc\u7684\u9879\u76ee\u3002<\/p>\n
\u770b\u770b\u6267\u884c\u8fc1\u79fb\u540e\u7684\u5dee\u5f02\u7ed3\u679c<\/h2>\n
\u6267\u884c\u987a\u5229\u5b8c\u6210\uff0c\u6ca1\u6709\u51fa\u73b0\u4efb\u4f55\u7279\u522b\u7684\u9519\u8bef\u3002<\/p>\n
\u6211\u5bf9\u6307\u5b9a\u4e86ngFor\u7684trackBy\u540e\u4f1a\u53d1\u751f\u4ec0\u4e48\u53d8\u5316\u611f\u5230\u597d\u5947\uff0c\u6240\u4ee5\u8fdb\u884c\u4e86\u786e\u8ba4\u3002<\/p>\n
-<ng-container *ngFor=\"let option of options; trackBy: trackByOption\">\r\n<\/span>+@for (option of options; track trackByOption($index, option)) {\r\n<\/span><\/code><\/pre>\n
\u770b\u8d77\u6765\u5df2\u7ecf\u8fdb\u884c\u4e86\u5f88\u597d\u7684\u8f6c\u6362\u3002\u4e0d\u9519\u5462\u3002
\n\u6211\u5927\u81f4\u770b\u4e86\u4e00\u904d\uff0c\u4f46\u6ca1\u6709\u7279\u522b\u503c\u5f97\u4e00\u63d0\u7684\u5185\u5bb9\uff0c\u53ea\u662f\u8fdb\u884c\u4e86\u4e00\u4e9b\u6539\u5199\u3002<\/p>\n
\u5728\u6784\u5efa\u8fc7\u7a0b\u4e2d\u53d1\u751f\u9519\u8bef\u7684\u60c5\u51b5<\/h2>\n
\u5728\u5c1d\u8bd5\u6784\u5efa\u65f6\uff0c\u53d1\u73b0\u4e86\u4e24\u79cd\u5bfc\u81f4\u6784\u5efa\u9519\u8bef\u7684\u60c5\u51b5\u3002<\/p>\n
\u9519\u8bef\u6848\u4f8b1<\/h3>\n
\u9519\u8bef TS2348: \u7c7b\u578b ‘typeof of’ \u7684\u503c\u4e0d\u53ef\u88ab\u8c03\u7528\u3002\u60a8\u662f\u4e0d\u662f\u60f3\u8981\u5305\u542b ‘new’\uff1f<\/p><\/blockquote>\n
\u7531\u4e8e\u5728 *ngFor \u7684\u53d8\u91cf\u4e2d\u4f7f\u7528\u4e86\u4fdd\u7559\u8bcd class\uff0c\u9020\u6210\u4e86\u4ee5\u4e0b\u95ee\u9898\u7684\u539f\u56e0\u3002<\/p>\n
<ng-container<\/span> *ngFor=<\/span>\"let class of classes\"<\/span>><\/span>\r\n  <span><\/span>{{ class }}<\/span><\/span>\r\n<\/ng-container><\/span>\r\n<\/code><\/pre>\n
\u8fd9\u4e2a\u7248\u672c\u53ef\u4ee5\u901a\u8fc7\u6784\u5efa\uff0c\u4f46\u662f\u4fee\u6539\u540e\u7684\u7248\u672c\u4f1a\u51fa\u73b0\u6784\u5efa\u9519\u8bef\u3002<\/p>\n
@for (class of classes; track class) {\r\n  <span><\/span>{{ class }}<\/span><\/span>\r\n}\r\n<\/code><\/pre>\n
\u6784\u9020\u6307\u4ee4\u7684\u8bed\u6cd5\u4e0e\u63a7\u5236\u6d41\u8bed\u6cd5\u7684\u8bc4\u4f30\u65b9\u5f0f\u4f3c\u4e4e\u6709\u6240\u4e0d\u540c\uff08\u8003\u8651\u5230\u66f4\u4e25\u683c\u5730\u5e94\u7528\u7c7b\u578b\u68c0\u67e5\uff0c\u8fd9\u662f\u53ef\u4ee5\u7406\u89e3\u7684\uff09\u3002\u5982\u679c\u88ab\u544a\u77e5\u5728ngFor\u5faa\u73af\u53d8\u91cf\u4e2d\u4f7f\u7528\u4fdd\u7559\u5b57\u662f\u9519\u8bef\u7684\uff0c\u90a3\u786e\u5b9e\u5982\u6b64\u3002\u5982\u679c\u4e0d\u5c0f\u5fc3\u5728ngFor\u5faa\u73af\u53d8\u91cf\u4e2d\u4f7f\u7528\u4fdd\u7559\u5b57\uff0c\u53ef\u80fd\u4f1a\u9047\u5230\u95ee\u9898\u3002<\/p>\n
\u9519\u8bef\u6848\u4f8b2<\/h3>\n
\u9519\u8befNG5002\uff1a@switch\u5757\u53ea\u80fd\u5305\u542b@case\u5757\u548c@default\u5757\u3002<\/p><\/blockquote>\n
\u5728 ngSwitch \u7684\u5bb9\u5668\u4e0b\u65b9\u5b58\u5728 ngIf \u7684\u60c5\u51b5\u4e0b\uff0c\u51fa\u73b0\u4e86\u6545\u969c\u3002<\/p>\n
\u5176\u5b9e\u6211\u81ea\u5df1\u4e5f\u4e0d\u592a\u660e\u767d\u81ea\u5df1\u5728\u5199\u4ec0\u4e48\uff0c\u800c\u4e14\u5bf9\u4e8e\u4e3a\u4ec0\u4e48\u4f1a\u53d8\u6210\u8fd9\u6837\u7684\u5b9e\u73b0\u65b9\u5f0f\u4e5f\u611f\u5230\u5f88\u8ff7\u60d1\uff0c\u4f46\u662f\u5728\u73b0\u6709\u7684\u4e1a\u52a1\u4ee3\u7801\u4e2d\uff0c\u6709\u5f88\u591a\u4e1c\u897f\u8981\u8003\u8651\u7684\u5462…<\/p>\n
\u4ee5\u4e0b\u662f\u5177\u4f53\u7684\u4ee3\u7801\u3002<\/p>\n
<ng-container<\/span> [ngSwitch]=<\/span>\"num\"<\/span>><\/span>\r\n  <ng-container<\/span> *ngIf=<\/span>\"greeting\"<\/span>><\/span>\r\n    <span><\/span>hello<\/span><\/span>\r\n  <\/ng-container><\/span>\r\n<\/ng-container><\/span>\r\n<\/code><\/pre>\n
\u65e0\u8bba\u5b9e\u65bd\u76ee\u7684\u5982\u4f55\uff0c\u4e0a\u8ff0\u4ee3\u7801\u5b9e\u9645\u4e0a\u53ef\u4ee5\u6210\u529f\u7f16\u8bd1\u901a\u8fc7\u3002\u5982\u679c\u5c06\u5176\u8fc1\u79fb\uff0c\u7ed3\u679c\u5c06\u5982\u4e0b\u6240\u793a\u3002<\/p>\n
@switch (num) {\r\n  @if (greeting) {\r\n    <span><\/span>hello<\/span><\/span>\r\n  }\r\n} \r\n<\/code><\/pre>\n
\u770b\u8d77\u6765\u5728 @switch \u5757\u91cc\u4e0d\u80fd\u653e\u7f6e @if \u5757\u5462\u3002<\/p>\n
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\u603b\u7ed3<\/h2>\n
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\u53ea\u8981\u4ee3\u7801\u4e0d\u662f\u8fc7\u4e8e\u6df7\u4e71\u5230\u8ba9\u4eba\u675f\u624b\u65e0\u7b56\uff0c\u5bf9\u4e8e\u81ea\u52a8\u6d4b\u8bd5\u5df2\u7ecf\u76f8\u5f53\u5b8c\u5584\u7684\u9879\u76ee\uff0c\u5728\u8fc1\u79fb\u547d\u4ee4\u4e2d\u4f7f\u7528\u673a\u68b0\u5316\u7684\u91cd\u5199\u65b9\u5f0f\uff0c\u518d\u901a\u8fc7\u81ea\u52a8\u6d4b\u8bd5\u6765\u8fdb\u884c\u786e\u8ba4\uff0c\u611f\u89c9\u5e94\u8be5\u662f\u53ef\u4ee5\u7684\u3002<\/p>\n
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\u660e\u5929\u662fbeltway7\u5148\u751f\u3002\u8bf7\u591a\u5173\u7167\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
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