Under the Hood of the Language Service

Under the Hood of the Language Service

State of the Language Service

State of the Language Service

The Angular Language Service was created back in 2016 when the ecosystem for editor experience (VS Code + TypeScript) was still in its infancy. In order to provide rich language features for Angular users, the Angular team had to overcome quite a few low-level architectural challenges. The View Engine compiler had to be adapted to the language service use case, which was not a design goal when the compiler was conceived. Since then, we have made tremendous progress in bringing more features and improved stability to the language service. However, there are fundamental problems like incremental compilation performance and more robust type checking. These are impossible to solve without overhauling the compiler. We realized this early on and devised a roadmap to pave the way for a brand new editor experience integrated with the Ivy compiler.

How to Get Started

Here’s how you can opt-in to the Ivy Language Service beta:

  • Install the latest extension in the VSCode Marketplace
  • Set strictTemplates: true in tsconfig.json Angular compiler options
  • (might cause diagnostics to appear if project is not strictTemplates compatible)
  • Open an Angular project in Visual Studio Code
  • Go to Preferences -> Settings -> Extensions -> Angular Language Service -> Check “Experimental Ivy”

Compiler-based Architecture

The Ivy powered Angular Language Service features better performance because it is built from the ground up for incremental builds. It is a complete rewrite of the previous View Engine-based language service that leverages the Ivy compiler.

Central to the new language service’s design is a deep integration with the Angular Compiler, which is an architectural pattern used in many modern language services. Our Compiler already has a thorough understanding of Angular code and we’ve been able to leverage its capabilities. In some cases we’ve been able to expand them — to deliver a faster, more accurate, and more powerful language service experience.

angular-ivy angular-11 angular

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