[APM] Simplify browser router types

[dgieselaar]

This simplifies & speeds up browser router types by:

• using a key-value pair for children so we don't have to use as const (and "unconst" it)
• replacing extends clauses with many branches (which was necessary before TS 4.5) by spread + infer syntax

Improves language server responsiveness by 2x (~1s vs ~0.5s).

[kibana-ci]

💚 Build Succeeded

• Buildkite Build
• Commit: 0b590a0
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Metrics [docs]

Module Count

Fewer modules leads to a faster build time

id	before	after	diff
apm	1184	1182	-2

Public APIs missing comments

Total count of every public API that lacks a comment. Target amount is 0. Run node scripts/build_api_docs --plugin [yourplugin] --stats comments for more detailed information.

id	before	after	diff
@kbn/typed-react-router-config	78	83	+5

Async chunks

Total size of all lazy-loaded chunks that will be downloaded as the user navigates the app

id	before	after	diff
apm	2.8MB	2.8MB	-21.0B

Public APIs missing exports

Total count of every type that is part of your API that should be exported but is not. This will cause broken links in the API documentation system. Target amount is 0. Run node scripts/build_api_docs --plugin [yourplugin] --stats exports for more detailed information.

id	before	after	diff
@kbn/typed-react-router-config	0	1	+1

Unknown metric groups

API count

id	before	after	diff
@kbn/typed-react-router-config	78	83	+5

History

• 💔 Build #18952 failed 9d652b2
• 💔 Build #18950 failed 41c4d97
• 💔 Build #18945 failed 087c367

To update your PR or re-run it, just comment with:
@elasticmachine merge upstream

[elasticmachine]

Pinging @elastic/apm-ui (Team:apm)

[gbamparop]

Thanks for adding these improvements!

[kibanamachine]

💔 All backports failed

Status	Branch	Result
❌	8.2	The branch "8.2" is invalid or doesn't exist

How to fix

Re-run the backport manually:

node scripts/backport --pr 123549

Questions ?

Please refer to the Backport tool documentation

[kibanamachine]

Friendly reminder: Looks like this PR hasn’t been backported yet.
To create backports run node scripts/backport --pr 123549 or prevent reminders by adding the backport:skip label.