Angular Interview Test 2025 – 400 Free Practice Questions to Pass the Exam

Ahead-of-Time (AOT) compilation is a powerful feature in Angular that compiles the application code during the build process rather than at runtime. This means that the Angular compiler converts the template and TypeScript code into efficient JavaScript before the application is served to the browser.

By doing this compilation ahead of time, it helps in several ways. First, it results in faster rendering in the browser because the compiler's job is already done, reducing the amount of work the browser needs to do when the application is loaded. Second, early detection of template errors happens during the build time, which can save developers a significant amount of time during development. Finally, AOT compilation can optimize the application size since unnecessary code can be eliminated during the build process.

This is why the key aspect of AOT compilation is its ability to efficiently compile code ahead of time, leading to improvements in performance and a more robust final build.