reference-core

What the skill teaches

A reference skill in the Angular repository that agents must read before changing Angular's core runtime in packages/core. It describes the four jobs of that package (rendering, dependency injection, change detection and reactivity), how compiled templates become runtime instructions, how per-instance and shared view data are laid out in parallel arrays, how module and element injectors resolve dependencies, and how OnPush, eager and signal-driven change detection differ. It maps the key source folders and warns that core relies on global state, private exports and compact data structures for speed, which changes should preserve. It closes with a short method for making changes and running the Bazel test suite.

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