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What is Angular Compatibility Compiler (ngcc) in Angular 7?

The ngcc Angular node_module compatibility compiler - The ngcc is a tool which "upgrades" node_module compiled with non-ivy ngc into ivy compliant format.

This compiler will convert node_modules compiled with Angular Compatibility Compiler (ngcc), into node_modules which appear to have been compiled with TSC compiler transformer (ngtsc) and this compiler conversions will allow such “legacy” packages to be used by the Ivy rendering engine.

TSC transformer which removes and converts @Pipe, @Component, @Directive and @NgModule to the corresponding definePipe, defineComponent, defineDirective and defineInjector.

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