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.

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[coveralls]

Pull Request Test Coverage Report for Build 12359126389

Details

• 48 of 52 (92.31%) changed or added relevant lines in 9 files are covered.
• 2 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+0.1%) to 85.756%

---

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	81.66%
packages/solid/src/reactive/scheduler.ts	1	80.95%

Totals
Change from base Build 11846786421:	0.1%
Covered Lines:	2290
Relevant Lines:	2607

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💛 - Coveralls