feat!: bump minimum Node version to 18.12 and TypeScript to 4.8.4

[JoshuaKGoldberg]

PR Checklist

• Addresses an existing open issue: fixes 🚀 Feature: Drop support for Node 16 #530; fixes 🚀 Feature: Drop support for TypeScript < 4.8.4 #532; closes 🛠 Tooling: "Update Docs" workflow never running #580
• That issue was marked as status: accepting prs
• Steps in CONTRIBUTING.md were taken

Overview

Removes the following methods that rely on deprecated parts of TypeScript:

• isInputFiles (ts.SyntaxKind.InputFiles)
• isUnparsedPrologue (ts.SyntaxKind.UnparsedPrologue)
• isUnparsedSourceText (ts.isUnparsedPrepend, ts.isUnparsedTextLike)
• isUnparsedSyntheticReference (ts.SyntaxKind. UnparsedSyntheticReference)

Also bumps all devDependencies to latest (ncu -u) to work on the latest Node 22 and 23 in CI.

💖

[codecov]

Codecov Report

Attention: Patch coverage is 49.65653% with 513 lines in your changes missing coverage. Please review.

Project coverage is 76.26%. Comparing base (30a5818) to head (6683dd7).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/nodes/typeGuards/union.ts	9.66%	187 Missing ⚠️
src/usage/UsageWalker.ts	66.22%	77 Missing ⚠️
src/usage/scopes.ts	60.84%	65 Missing ⚠️
src/nodes/access.ts	35.00%	52 Missing ⚠️
src/types/utilities.ts	67.79%	38 Missing ⚠️
src/comments.ts	16.66%	25 Missing ⚠️
src/nodes/utilities.ts	22.22%	21 Missing ⚠️
src/usage/getUsageDomain.ts	70.49%	18 Missing ⚠️
src/usage/declarations.ts	11.11%	8 Missing ⚠️
src/usage/getPropertyName.ts	0.00%	6 Missing ⚠️
... and 5 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #531      +/-   ##
==========================================
- Coverage   80.93%   76.26%   -4.67%     
==========================================
  Files          35       50      +15     
  Lines        6666     4946    -1720     
  Branches      448      663     +215     
==========================================
- Hits         5395     3772    -1623     
+ Misses       1271     1173      -98     
- Partials        0        1       +1     

Flag	Coverage Δ
4.3.5	?
4.6.4	?
4.8.4	73.59% <46.90%> (?)
4.9.5	?
latest	75.83% <47.59%> (-4.69%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[RebeccaStevens]

@JoshuaKGoldberg I updated a few things. LGTM now

[JoshuaKGoldberg]

Great thanks! I think we should wait on #535 to get these merged in the same time, since #535 is a breaking change too.

Edit: #535 was switched to non-breaking; now it's #574 -> #575. Also #573 -> #576.

[JoshuaKGoldberg]

I'd like to merge this, #575, and #576 all at the same time to get one big breaking change v2. fyi @kirkwaiblinger @RebeccaStevens

[RebeccaStevens]

I think all 3 of these PRs are ready now.

[RebeccaStevens]

Note: generated docs will now be pushed directly to the main branch rather than the gh-pages branch (The gh-pages branch can be delete once this is merged). Repo setting will need to be updated to reflect this change.
It might be possible that we don't need to push the generated docs to any branch at all, I'll look into this.

Edit: Docs don't need to be pushed to any branch.

[RebeccaStevens]

@JoshuaKGoldberg I think this is all good to go now. Do you want to give it one last look over and then push the merge button if it all looks good to you?

[JoshuaKGoldberg]

Oh @RebeccaStevens I missed this. #608