perf(compiler-cli): optimize NgModule emit for standalone components #49837
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atscott
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Apr 13, 2023
packages/compiler-cli/src/ngtsc/annotations/ng_module/src/handler.ts
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What is callback here supposed to be? I also don't see any calls to this function where the callback isn't passed so does it have to be optional?
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I renamed it to dependencyCallback and added jsdocs.
It's optional because, for the conceptual operation of "does X contain exported providers?", a consumer may only be interested in the answer and not in recording information about dependencies (for example, if producing a diagnostic instead of emitting code).
packages/compiler-cli/src/ngtsc/annotations/ng_module/src/handler.ts
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packages/compiler-cli/src/ngtsc/annotations/directive/src/handler.ts
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NgModules which import standalone components currently list those components in their injector definitions, because we assume that any standalone component may export providers from its own imports. This commit adds an optimization for that emit, which attempts to statically analyze the NgModule imports and determine which standalone components, if any are present, do not export providers and thus can be omitted. This analysis is imperfect, because some imported components may be declared outside of the current compilation, or transitively import types which are declared outside the compilation. These types are therefore _assumed_ to carry providers and so the optimization isn't applied to them.
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@alxhub I've updated this to |
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This PR was merged into the repository by commit 78c76ce. |
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…49837) NgModules which import standalone components currently list those components in their injector definitions, because we assume that any standalone component may export providers from its own imports. This commit adds an optimization for that emit, which attempts to statically analyze the NgModule imports and determine which standalone components, if any are present, do not export providers and thus can be omitted. This analysis is imperfect, because some imported components may be declared outside of the current compilation, or transitively import types which are declared outside the compilation. These types are therefore _assumed_ to carry providers and so the optimization isn't applied to them. PR Close #49837
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NgModules which import standalone components currently list those components in their injector definitions, because we assume that any standalone component may export providers from its own imports.
This commit adds an optimization for that emit, which attempts to statically analyze the NgModule imports and determine which standalone components, if any are present, do not export providers and thus can be omitted.
This analysis is imperfect, because some imported components may be declared outside of the current compilation, or transitively import types which are declared outside the compilation. These types are therefore assumed to carry providers and so the optimization isn't applied to them.