perf(@angular/cli): enable Node.js compile code cache when available #28432
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The Angular CLI will now enable the Node.js compile cache when available
for use. Node.js v22.8 and higher currently provide support for this feature.
The compile cache stores the v8 intermediate forms of JavaScript code for the Angular
CLI itself. This provides a speed up to initialization on subsequent uses the Angular CLI.
The Node.js cache is stored in a temporary directory in a globally accessible
location so that all Node.js instances of a compatible version can share the
cache. The code cache can be disabled if preferred via `NODE_DISABLE_COMPILE_CACHE=1`.
Based on initial profiling, this change provides an ~6% production build time
improvement for a newly generated project once the cache is available.
```
Benchmark 1: NODE_DISABLE_COMPILE_CACHE=1 node ./node_modules/.bin/ng build
Time (mean ± σ): 2.617 s ± 0.016 s [User: 3.795 s, System: 1.284 s]
Range (min … max): 2.597 s … 2.640 s 10 runs
Benchmark 2: node ./node_modules/.bin/ng build
Time (mean ± σ): 2.475 s ± 0.017 s [User: 3.555 s, System: 1.354 s]
Range (min … max): 2.454 s … 2.510 s 10 runs
Summary
node ./node_modules/.bin/ng build ran
1.06 ± 0.01 times faster than NODE_DISABLE_COMPILE_CACHE=1 node ./node_modules/.bin/ng build
```
alan-agius4
approved these changes
Sep 17, 2024
alfaproject
reviewed
Sep 17, 2024
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The Angular CLI will now enable the Node.js compile cache when available for use. Node.js v22.8 and higher currently provide support for this feature. The compile cache stores the v8 intermediate forms of JavaScript code for the Angular CLI itself. This provides a speed up to initialization on subsequent uses the Angular CLI. The Node.js cache is stored in a temporary directory in a globally accessible location so that all Node.js instances of a compatible version can share the cache. The code cache can be disabled if preferred via
NODE_DISABLE_COMPILE_CACHE=1.Based on initial profiling, this change provides an ~6% production build time improvement for a newly generated project once the cache is available.