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DEV: @babel/plugin-proposal-decorators -> decorator-transforms (#27260)

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decorator-transforms (https://github.com/ef4/decorator-transforms) is a modern replacement for babel's plugin-proposal-decorators. It provides a decorator implementation using modern browser features, without needing to enable babel's full suite of class feature transformations. This improves the developer experience and performance.

In local testing with Google's 'tachometer' tool, this reduces Discourse's 'init-to-render' time by around 3-4% (230ms -> 222ms).

It reduces our initial gzip'd JS payloads by 3.2% (2.43MB -> 2.35MB), or 7.5% (14.5MB -> 13.4MB) uncompressed.

This was previously reverted in 97847f6. This version includes a babel transformation which works around the bug in Safari <= 15.

For Cloudflare compatibility issues, check https://meta.discourse.org/t/311390
This commit is contained in:
David Taylor
2024-06-10 15:51:48 +01:00
committed by GitHub
parent 7bdf47b864
commit 565c753dd2
19 changed files with 141 additions and 24 deletions
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lib/discourse_js_processor.rb
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@ -9,9 +9,7 @@ class DiscourseJsProcessor
# To generate a list of babel plugins used by ember-cli, set
# babel: { debug: true } in ember-cli-build.js, then run `yarn ember build -prod`
DISCOURSE_COMMON_BABEL_PLUGINS = [
["proposal-decorators", { legacy: true }],
"proposal-class-properties",
"proposal-private-methods",
["decorator-transforms", { runEarly: true }],
"proposal-class-static-block",
"transform-parameters",
"proposal-export-namespace-from",