fix: createSignal not found when bundled

[CrabNejonas]

In some circumstances a global function export (like createSignal) can be transformed by rollup into a let binding, which will break the global evaluation of transPending since then createSignal will be defined after being used.
I.e. the code from signal.ts which looks like this:

const [transPending, setTransPending] = createSignal(false);

// ... some other code

export function createSignal(){}

will be translated to

let createSignal;

const [transPending, setTransPending] = createSignal(false);

export function createSignal(){}

which obviously won't work anymore since the let definition isn't hoisted.

While I believe this bug should fundamentally be solved in rollup itself this is a quick, rather painless fix (it's interesting that rollup isn't smart enough to reason about in-file dependencies in this way)

How did you test this change?

The app that this came up in is still closed-source unfortunately, and this bug - being a codegen-bug - proofed itself to be hard to reproduce, but I hope the above reasoning is easy enough to follow.

[changeset-bot]

🦋 Changeset detected

Latest commit: d309935

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

Not sure what this means? Click here to learn what changesets are.

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

[ryansolid]

Thank you

[coveralls]

Pull Request Test Coverage Report for Build 7064336723

Warning: This coverage report may be inaccurate.

We've detected an issue with your CI configuration that might affect the accuracy of this pull request's coverage report.
To ensure accuracy in future PRs, please see these guidelines.
A quick fix for this PR: rebase it; your next report should be accurate.

• 3 of 3 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 93.486%

---

Totals
Change from base Build 6963643110:	0.0%
Covered Lines:	4148
Relevant Lines:	4368

---

💛 - Coveralls