target es2021

[CraigMacomber]

Description

Target es2021.

This should reduce bundle size a little by allowing TypeScript to use slightly newer language features.

Breaking Changes

According to https://github.com/microsoft/FluidFramework/blob/main/ClientRequirements.md to require customers to have es2022 support or polyfill, so this should be allowed.

This does NOT change the "lib" version, so customers should not need to add new library polyfills and does not change what APIs are allowed to be used in our code: this only updates the language version to allow using newer language features.

As we don't actually have any tooling in place to prevent our dependencies from using newer language (or library) features, its likely we already implicitly have this requirement.

Reviewer Guidance

The review process is outlined on this wiki page.

Copilot reviewed 1 out of 2 changed files in this pull request and generated no comments.

Files not reviewed (1)

• common/build/build-common/tsconfig.base.json: Language not supported

[github-actions]

🔗 No broken links found! ✅

Your attention to detail is admirable.

linkcheck output

> [email protected] ci:check-links /home/runner/work/FluidFramework/FluidFramework/docs
> start-server-and-test "npm run serve -- --no-open" 3000 check-links

1: starting server using command "npm run serve -- --no-open"
and when url "[ 'http://127.0.0.1:3000' ]" is responding with HTTP status code 200
running tests using command "npm run check-links"


> [email protected] serve
> docusaurus serve --no-open

[SUCCESS] Serving "build" directory at: http://localhost:3000/

> [email protected] check-links
> linkcheck http://localhost:3000 --skip-file skipped-urls.txt

Crawling...

Stats:
  170508 links
    1603 destination URLs
    1842 URLs ignored
       0 warnings
       0 errors