[@types/jest]: bump dependencies to v26

[L2jLiga]

Jest v26 requires TS 3.8+ (see jestjs/jest#9823).

Changed

• updated dependencies
• merged typings from index.d.ts and ts3.1/index.d.ts
• removed ts3.1
• set minimum TypeScript version to 3.8

Checklist

• Use a meaningful title for the pull request. Include the name of the package modified.
• Test the change in your own code. (Compile and run.)
• Add or edit tests to reflect the change. (Run with npm test.)
• Follow the advice from the readme.
• Avoid common mistakes.
• Run npm run lint package-name (or tsc if no tslint.json is present).
• Provide a URL to documentation or source code which provides context for the suggested changes: chore: require minimum typescript@3.8 jestjs/jest#9823
• Include tests for your changes

[typescript-bot]

@L2jLiga Thank you for submitting this PR!

This is a live comment which I will keep updated.

1 package in this PR

• jest on npm, on unpkg

Code Reviews

Because this is a widely-used package, a DT maintainer will need to review it before it can be merged.

Status

• ✅ No merge conflicts
• ❌ Continuous integration tests have passed
• ❌ A DT maintainer needs to approve changes which affect module config files
  • jest/package.json: edited
  • jest/ts3.1/tsconfig.json: couldn't fetch contents
  • jest/ts3.1/tslint.json: couldn't fetch contents

Once every item on this list is checked, I'll ask you for permission to merge and publish the changes.

---

Diagnostic Information: What the bot saw about this PR

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[typescript-bot]

🔔 @NoHomey @jwbay @asvetliakov @alexjoverm @epicallan @ikatyang @wsmd @JamieMason @douglasduteil @ahnpnl @JoshuaKGoldberg @UselessPickles @r3nya @Hotell @sebald @andys8 @antoinebrault @gstamac @ExE-Boss @quassnoi @Belco90 @tonyhallett @ycmjason @devanshj @pawfa @regevbr — please review this PR in the next few days. Be sure to explicitly select Approve or Request Changes in the GitHub UI so I know what's going on.

[typescript-bot]

@L2jLiga The CI build failed! Please review the logs for more information.

Once you've pushed the fixes, the build will automatically re-run. Thanks!

[typescript-bot]

@L2jLiga The CI build failed! Please review the logs for more information.

Once you've pushed the fixes, the build will automatically re-run. Thanks!

[L2jLiga]

Closing this for now, have to check expect-puppeteer types and find workaround for Expect.addSnapshotSerializer and MatcherUtils.utils.diff

[typescript-bot]

👋 Hi there! I’ve run some quick measurements against master and your PR. These metrics should help the humans reviewing this PR gauge whether it might negatively affect compile times or editor responsiveness for users who install these typings.

Let’s review the numbers, shall we?

	master	#47545	diff
Batch compilation
Memory usage (MiB)	79.7	85.8	+7.6%
Type count	11872	15315	+29%
Assignability cache size	3723	4839	+30%
Language service
Samples taken	18	2610	+14400%
Identifiers in tests	18	2610	+14400%
getCompletionsAtPosition
Mean duration (ms)	355.8	359.9	+1.1%
Mean CV	12.3%	8.1%
Worst duration (ms)	411.9	474.8	+15.3%
Worst identifier	expect	toHaveProperty
getQuickInfoAtPosition
Mean duration (ms)	343.1	360.3	+5.0%
Mean CV	10.2%	8.3%	-18.6%
Worst duration (ms)	376.9	471.2	+25.0% 🔸
Worst identifier	BigInt	Case

Looks like there were a couple significant differences—take a look at worst-case duration for getting quick info at a position to make sure everything looks ok.

[G-Rath]

I guess this means we're locked in to the old dependencies until 2022 😬

[L2jLiga]

We can bump minimal TS version everywhere to 3.8.. i mean dependable types

[G-Rath]

I don't mind doing that if it's ok with DT - I think it's fair to say that while DT doesn't drop support for <3.8 until 2022, @types/jest & co can drop it now as it's matching the min supported by jest.