Commits on Sep 14, 2020

1. perf(compiler-cli): only emit directive/pipe references that are used …

   For the compilation of a component, the compiler has to prepare some
   information about the directives and pipes that are used in the template.
   This information includes an expression for directives/pipes, for usage
   within the compilation output. For large NgModule compilation scopes
   this has shown to introduce a performance hotspot, as the generation of
   expressions is quite expensive. This commit reduces the performance
   overhead by only generating expressions for the directives/pipes that
   are actually used within the template, significantly cutting down on
   the compiler's resolve phase.

   

   JoostK committed Sep 14, 2020
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   182a909 View commit details

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2. perf(compiler-cli): optimize computation of type-check scope information …

   When type-checking a component, the declaring NgModule scope is used
   to create a directive matcher that contains flattened directive metadata,
   i.e. the metadata of a directive and its base classes. This computation
   is done for all components, whereas the type-check scope is constant per
   NgModule. Additionally, the flattening of metadata is constant per
   directive instance so doesn't necessarily have to be recomputed for
   each component.
   
   This commit introduces a `TypeCheckScopes` class that is responsible
   for flattening directives and computing the scope per NgModule. It
   caches the computed results as appropriate to avoid repeated computation.

   

   JoostK committed Sep 14, 2020
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   216a913 View commit details

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