Update client to ES2022 #25398
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Update client to ES2022 #25398
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| Fluid Framework has not officially supported targets older than ES2022 since before 2.0: this is documented in [ClientRequirements.md](https://github.com/microsoft/FluidFramework/blob/main/ClientRequirements.md) as well as the ReadMe for every client package. | ||
| This change does not involve any change to what is officially supported. | ||
| It is possible this change could impact users of less up to date JavaScript runtimes: |
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🚫 [vale] reported by reviewdog 🐶
[Vale.Spelling] Did you really mean 'runtimes'?
| Fluid Framework has not officially supported targets older than ES2022 since before 2.0: this is documented in [ClientRequirements.md](https://github.com/microsoft/FluidFramework/blob/main/ClientRequirements.md) as well as the ReadMe for every client package. | ||
| This change does not involve any change to what is officially supported. | ||
| It is possible this change could impact users of less up to date JavaScript runtimes: | ||
| such users can use a tool like [babel](https://babeljs.io/) to transpile out unsupported language features. |
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🚫 [vale] reported by reviewdog 🐶
[Vale.Spelling] Did you really mean 'transpile'?
This was referenced Sep 4, 2025
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This PR has been automatically marked as stale because it has had no activity for 60 days. It will be closed if no further activity occurs within 8 days of this comment. Thank you for your contributions to Fluid Framework! |
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Description
Update client to ES2022.
ES2022 saves over 2% (7309 bytes) on bundle size (measured using SharedTree bundles which includes all of the runtime shared tree uses as well).
Also building targeting ES2022 provides a better debug experience for JS private properties by not polyfilling them to weak map lookups.
Note that Fluid Framework has no validation that our dependencies don't already have dependencies on newer things, and no compatibility testing for older or less supported runtimes.
Tracked by AB#34388.
Breaking Changes
See changeset
Reviewer Guidance
The review process is outlined on this wiki page.
This needs special review based on potential impact on customers and our current lack of process for how to handle such updates.