💥 remove some polyfills

[thomas-lebeau]

[!Note] This PR is targeting the v6 branch

Motivation

Reduce bundle size by supporting only browser that support ES2018. We can remove some polyfills as they are supported by natively on the new browser support matrix

Changes

Remove the following polyfills:

• Array.includes()
• String.includes()
• Array.find()
• Array.from()
• String.starstWith()
• String.endsWith()
• Array.forEach()
• CSS.escape()
• Element.matches()
• Node.parentElement()
• Element.classList
• WeakSet
• Element.closest()
• Element.labels
• Map.keys()

Testing

• [x] Local
• [ ] Staging
• [x] Unit
• [x] End to end

---

I have gone over the contributing documentation.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 96.36364% with 2 lines in your changes missing coverage. Please review.

Project coverage is 93.75%. Comparing base (c04e32b) to head (b64d2a1).

Files	Patch %	Lines
packages/rum-core/src/browser/cookieObservable.ts	50.00%	1 Missing :warning:
...kages/rum/src/domain/record/trackers/trackInput.ts	0.00%	1 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##               v6    #2857      +/-   ##
==========================================
+ Coverage   93.36%   93.75%   +0.38%     
==========================================
  Files         268      267       -1     
  Lines        7481     7378     -103     
  Branches     1687     1659      -28     
==========================================
- Hits         6985     6917      -68     
+ Misses        496      461      -35     

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

[cit-pr-commenter[bot]]

Bundles Sizes Evolution

📦 Bundle Name	Base Size	Local Size	𝚫	𝚫%	Status
Rum	150.84 KiB	149.42 KiB	-1457 B	-0.94%	✅
Logs	51.11 KiB	50.78 KiB	-339 B	-0.65%	✅
Rum Slim	100.76 KiB	99.38 KiB	-1417 B	-1.37%	✅
Worker	25.16 KiB	25.16 KiB	0 B	0.00%	✅

🚀 CPU Performance

Action Name	Base Average Cpu Time (ms)	Local Average Cpu Time (ms)	𝚫
addglobalcontext	0.001	0.001	0.000
addaction	0.032	0.030	-0.002
adderror	0.032	0.032	-0.001
addtiming	0.001	0.001	-0.000
startview	0.846	0.862	0.016
startstopsessionreplayrecording	0.724	0.918	0.194
logmessage	0.019	0.024	0.005

🧠 Memory Performance

Action Name	Base Consumption Memory (bytes)	Local Consumption Memory (bytes)	𝚫 (bytes)
addglobalcontext	20.89 KiB	21.85 KiB	985 B
addaction	70.99 KiB	70.85 KiB	-146 B
adderror	85.21 KiB	84.84 KiB	-371 B
addtiming	18.63 KiB	16.94 KiB	-1734 B
startview	336.71 KiB	334.29 KiB	-2486 B
startstopsessionreplayrecording	15.66 KiB	15.85 KiB	197 B
logmessage	71.47 KiB	69.75 KiB	-1767 B

🔗 RealWorld