@angular/platform-browser-dynamic

The JIT-compatible browser bootstrap. Bundles @angular/compiler so that templates can be compiled at runtime in the browser. Mostly legacy at this point — production builds AOT-compile and this package is rarely needed.

Purpose

Provides platformBrowserDynamic() and platformBrowserDynamicTesting() — the entry points used in:

• Test harnesses (platformBrowserDynamicTesting is the default test platform for many karma setups).
• Stackblitz-style sandboxes that compile templates at runtime.
• Older NgModule-based apps that haven't moved to AOT bootstrap.

The package is small (~700 lines of TypeScript) — most of its weight comes from including the compiler in the bundle.

Directory layout

packages/platform-browser-dynamic/
├── src/
│   ├── platform_core_dynamic.ts
│   ├── platform_browser_dynamic.ts
│   └── ...
├── testing/
└── public_api.ts

Key abstractions

Type / function	File	What it is
platformBrowserDynamic	packages/platform-browser-dynamic/src/platform_browser_dynamic.ts	JIT-capable browser platform.
platformBrowserDynamicTesting	packages/platform-browser-dynamic/testing/	The default test platform.

Integration points

• @angular/core — uses the same DI / runtime as the AOT bootstrap.
• @angular/compiler — bundled in to perform JIT compilation.
• @angular/platform-browser — JIT-bootstrap reuses most of the rendering stack.

Status

New apps should use bootstrapApplication from @angular/platform-browser (AOT) rather than this package. The package remains because tests and a long tail of legacy apps still depend on it.