feat(www): shorter repl shareables

[cyyynthia]

This PR contains:

• bugfix
• feature
• refactor
• documentation
• other

Are tests included?

• yes (bugfixes and features will not be merged without tests)
• no

Breaking Changes?

• yes (breaking changes will not be merged unless absolutely necessary)
• no

Description

This PR tweaks the way shareable URLs are being generated and parsed, to make the "shareable" data parameter smaller. Taking the shareable used in #6065, the URL is ~5.4kB without this change and ~3.7kB with the change.

Reduction is achieved by not URI-encoding the JSON object, instead opting to turn the base64 string into the base64url variant. There is a check to detect URI-encoded shareables to make the change fully backwards compatible with all the REPL links in the wild.

[vercel]

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Project	Deployment	Preview	Comments	Updated (UTC)
rollup	Ready	Preview	Comment	Sep 5, 2025 0:45am

[lukastaegert]

Good thinking! To be honest, I never considered looking into optimizations here, it has probably been like this forever.

[github-actions]

Thank you for your contribution! ❤️

You can try out this pull request locally by installing Rollup via

npm install cyyynthia/rollup#shorter-shareables

Notice: Ensure you have installed the latest nightly Rust toolchain. If you haven't installed it yet, please see https://www.rust-lang.org/tools/install to learn how to download Rustup and install Rust.

or load it into the REPL:
https://rollup-iyxfv4bl1-rollup-js.vercel.app/repl/?pr=6088

[github-actions]

Performance report

• BUILD: 6884ms, 832 MB
  • initialize: 0ms, 25 MB (+8%)
  • generate module graph: 2572ms, 633 MB
    • generate ast: 1387ms, 622 MB
  • sort and bind modules: 393ms, 693 MB
  • mark included statements: 3922ms, 832 MB
    • treeshaking pass 1: 2299ms, 828 MB
    • treeshaking pass 2: 460ms, 818 MB
    • treeshaking pass 3: 393ms, 833 MB
    • treeshaking pass 4: 383ms, 823 MB (+3%)
    • treeshaking pass 5: 379ms, 832 MB
• GENERATE: 797ms (+108ms, +15.7%), 919 MB (-6%)
  • initialize render: 0ms, 845 MB (-6%)
  • generate chunks: 232ms (+188ms, +420.0%), 822 MB (-7%)
    • optimize chunks: 0ms, 860 MB (-2%)
  • render chunks: 631ms (+14ms, +2.3%), 901 MB (-6%)
  • transform chunks: 21ms, 919 MB (-6%)
  • generate bundle: 0ms, 919 MB (-6%)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.79%. Comparing base (298609e) to head (f94e3a3).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #6088   +/-   ##
=======================================
  Coverage   98.79%   98.79%           
=======================================
  Files         271      271           
  Lines       10622    10622           
  Branches     2840     2840           
=======================================
  Hits        10494    10494           
  Misses         88       88           
  Partials       40       40           

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[github-actions]

This PR has been released as part of [email protected]. You can test it via npm install rollup.

[joaoninguemgostoso-code]

This PR contains:

* [ ×]  bugfix

* [× ]  feature

* [ ]  refactor

* [x]  documentation

* []  other

Are tests included?

* [× ]  yes (_bugfixes and features will not be merged without tests_)

* []  no

Breaking Changes?

* [× ]  yes (_breaking changes will not be merged unless absolutely necessary_)

* []  no

Description

This PR tweaks the way shareable URLs are being generated and parsed, to make the "shareable" data parameter smaller. Taking the shareable used in #6065, the URL is ~5.4kB without this change and ~3.7kB with the change.

Reduction is achieved by not URI-encoding the JSON object, instead opting to turn the base64 string into the base64url variant. There is a check to detect URI-encoded shareables to make the change fully backwards compatible with all the REPL links in the wild.