How to Fix Custom Angular Schematics That Are Extremely Slow

Описание: Discover how to optimize your custom Angular Schematics and significantly reduce component generation time with practical solutions.
---
This video is based on the question https://stackoverflow.com/q/66102267/ asked by the user 'Maciej Wojcik' ( https://stackoverflow.com/u/3995346/ ) and on the answer https://stackoverflow.com/a/66115276/ provided by the user 'Maciej Wojcik' ( https://stackoverflow.com/u/3995346/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Custom Angular Schematics extremly slow

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
How to Fix Custom Angular Schematics That Are Extremely Slow

If you've ever worked with Angular Schematics, you may have encountered unexpected slow performance, particularly when generating components. For developers creating custom schematics, this can be frustrating, especially when generative processes take several minutes. Let’s explore the issues surrounding slow Angular Schematics and how to resolve them.

The Problem: Slow Component Generation

In a recent experience, a developer faced a significant delay when running the command ng generate component to create components using their custom schematic. While the functionality was intact, the generation process took over three minutes to complete. This raised questions about what might be causing the delay and how to troubleshoot it.

Key Points to Consider

Custom Templates: The developer was overriding the default Angular Schematics with a custom template for spec files.

Initial Performance: A console log indicated that the initial part of the function was processing quickly, but subsequent tasks stalled for an extended period.

The Analysis: Understanding the Bottleneck

Upon investigation, it became evident that the culprit was the filter function present within the schematic code. This function was not merely filtering the newly created files; it was also examining every file present in the project directory. This exhaustive check contributed significantly to the slowdown.

Code Under Scrutiny

Here’s a snippet of the initial implementation:

[[See Video to Reveal this Text or Code Snippet]]

The Solution: Removing the Filter Function

To rectify the issue, the developer made a strategic decision to eliminate the filter function altogether. Instead, the focus was shifted directly to merging the template source. Here’s the streamlined code:

[[See Video to Reveal this Text or Code Snippet]]

Benefits of the Change

Enhanced Performance: By removing the unnecessary filtering step, component generation time was drastically reduced.

Simplicity: This not only improved speed but also simplified the code structure.

Final Thoughts: Optimizing Your Custom Schematics

When working with Angular Schematics, it’s essential to optimize for performance, especially in custom implementations. Here are some quick tips:

Profile Your Code: Utilize console logs or tools to monitor which sections of your code take the longest to execute.

Avoid Unnecessary Checks: Use only the crucial checks needed for your schematic to reduce processing time.

Streamline Code: Always look for opportunities to simplify your code.

By applying these practices, you can ensure your custom Angular Schematics operate smoothly and efficiently, creating a better development experience overall.

If you're dealing with sluggish custom schematics, remember that minor adjustments to your code could lead to significant enhancements! Happy coding!