What exactly does the $any() type cast in Angular do and how is it used?

While browsing the Angular.io site, I came across this title:

The $any() type cast function There are instances where a binding expression may trigger a type error during AOT compilation and it is not possible or difficult to fully specify the type. To resolve this issue, you can utilize the $any() cast function to cast the expression to the any type as shown in the example below:

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

However, there isn't much more information regarding description, benefits, or best practices related to this.

  1. What exactly is it from a technical standpoint?
  2. When do we need to use this functionality?
angulartypescript

Answer №1

Enabling "fullTemplateTypeCheck" in the project's "angularCompilerOptions" will make the Angular compiler more strict in checking template types, preventing potential runtime crashes caused by errors.

Using $any() in binding expressions allows you to bypass type checking for that specific expression, similar to using `as any` in TypeScript. This can be useful for allowing expressions to work at runtime even if they do not pass type-checking.

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