perf(@angular-devkit/build-angular): reduce babel transformation in esbuild builder #23682
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…o downlevel native async/await esbuild now allows specifying whether individual JavaScript features should be supported in addition to specifying the target JavaScript version for the output. This capability is now used to provide the native async/await downleveling that is required by Zone.js when using the experimental esbuild- based browser application builder. Since esbuild does not yet support downleveling async iteration or async generators, Babel is still used when either of these syntax features are detected.
…sbuild builder When using the experimental esbuild-based browser application builder, babel transformation is now only performed on a file if the file requires the specific transformations enabled for the build. This has the benefit of removing the need to parse and process files that will not be affected by the enabled transformations. From initial testing, this provides a 30% build time improvement for development builds of a newly generated application and a 10% improvement for production builds.
clydin
added
target: minor
alan-agius4
approved these changes
Aug 4, 2022
alan-agius4
added
action: merge
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When using the experimental esbuild-based browser application builder, babel transformation
is now only performed on a file if the file requires the specific transformations enabled
for the build. This has the benefit of removing the need to parse and process files that
will not be affected by the enabled transformations.
From initial testing, this provides a 30% build time improvement for development builds of a
newly generated application and a 10% improvement for production builds.