Summary
This video explains Hot Module Replacement (HMR) in Angular 19, focusing on its impact on styling. HMR allows for updating parts of an application without a full page reload, improving developer workflow, particularly when working with large forms or complex styling. The video demonstrates HMR's functionality with and without HMR enabled, showcasing how styles update without affecting form data when HMR is active. It also explains how to enable or disable HMR within the `angular.json` configuration file. Finally, it clarifies that HMR is intended for development purposes, not production.
Highlights
💻 HMR in Angular 19 now supports style updates: Previously, style changes triggered a full component reload. Now, only the styles are updated, preserving form data.
💡 Improved developer experience: HMR significantly speeds up development by eliminating the need for full page refreshes during style or minor component changes. This is particularly useful with large forms.
✏️ Preservation of form data: When using HMR, updating styles or making small component changes does not erase user input in forms.
🛠️ Enabling/Disabling HMR: The video shows how to easily control HMR in `angular.json` (setting the `hmr` option in the build target).
⚠️ HMR for development only: The video stresses that HMR is a development tool; it should not be used in production builds.
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