[Angular 9] Built-in template syntax $any

The $any() type cast function

Sometimes a binding expression triggers a type error during AOT compilation and it is not possible or difficult to fully specify the type. To silence the error, you can use the $any() cast function to cast the expression to the any type as in the following example:

<p>The item‘s undeclared best by date is: {{$any(item).bestByDate}}</p>

When the Angular compiler turns this template into TypeScript code, it prevents TypeScript from reporting that bestByDate is not a member of the item object when it runs type checking on the template.

The $any() cast function also works with this to allow access to undeclared members of the component. The $any() cast function works anywhere in a binding expression where a method call is valid.

原文地址：https://www.cnblogs.com/Answer1215/p/12322685.html