Update typescript to 5.7

[thetarnav]

Since version 5.7 typescript doesn't like comparing strings for truthiness

And inlining "_SOLID_DEV_" as any as boolean doesn't seem to do the trick.

So I've added a constant and use it in place of strings which silences the errors.

const IS_DEV = "_SOLID_DEV_" as string | boolean

The output looks almost identical to using strings directly - most code paths behind a dev check get removed in prod entries. Some uncleaned if statements remain, but as they did with strings before.

const IS_DEV = false;
// ...
if (IS_DEV); // the block gets removed but if remains
else {
	// ...
}

The variable is not exported outside of the module, just internally between files to not redeclare it in every file.

Other option would be to use @ts-expect-error everywhere but that just seem a bit noisy.

---

Also had to add some additional assertions ! to variable declarations for refs, as they are "being used before assigned" from ts point of view.

[changeset-bot]

🦋 Changeset detected

Latest commit: df4b7e4

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
solid-js	Patch
test-integration	Patch

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Click here if you're a maintainer who wants to add another changeset to this PR

[coveralls]

Pull Request Test Coverage Report for Build 12679170092

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 48 of 52 (92.31%) changed or added relevant lines in 9 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.02%) to 85.607%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
packages/solid/src/reactive/array.ts	1	2	50.0%
packages/solid/src/render/component.ts	2	3	66.67%
packages/solid/src/reactive/signal.ts	23	25	92.0%

Files with Coverage Reduction	New Missed Lines	%
packages/solid/src/reactive/signal.ts	1	81.65%

Totals
Change from base Build 11846786421:	-0.02%
Covered Lines:	2287
Relevant Lines:	2607

---

💛 - Coveralls

[ryansolid]

Thanks