Support Angular @let declaration syntax (#16474)

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changelog_unreleased/angular/16474.md

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+#### Support `@let` declaration syntax (#16474 by @sosukesuzuki)
+
+Adds support for Angular v18 `@let` declaration syntax.
+
+Please see the following code example. The `@let` declaration allows you to define local variables within the template:
+
+<!-- prettier-ignore -->
+```html
+@let name = 'Frodo';
+
+<h1>Dashboard for {{name}}</h1>
+Hello, {{name}}
+```
+
+For more details, please refer to the excellent blog post by the Angular Team: [Introducing @let in Angular](https://blog.angular.dev/introducing-let-in-angular-686f9f383f0f).
+
+We also appreciate the Angular Team for kindly answering our questions to implement this feature.