check for an implementation of AsyncLocalStorage

[caass]

Certain runtime APIs are only available to workers during the "request context", which is any code that returns after receiving a request and before returning a response.

Miniflare emulates this behavior by using an AsyncLocalStorage and checking at runtime to see if you're using those APIs during the request context.

In certain environments AsyncLocalStorage is unavailable, such as in a webcontainer. This function figures out if we're able to run those "request context" checks and returns a set of options that indicate to miniflare whether to run the checks or not.

Closes #863

[changeset-bot]

🦋 Changeset detected

Latest commit: 22d59ef

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

This PR includes changesets to release 1 package

Name	Type
wrangler	Patch

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[github-actions]

A wrangler prerelease is available for testing. You can install this latest build in your project with:

npm install --save-dev https://prerelease-registry.developers.workers.dev/runs/2247677395/npm-package-wrangler-866

You can reference the automatically updated head of this PR with:

npm install --save-dev https://prerelease-registry.developers.workers.dev/prs/866/npm-package-wrangler-866

Or you can use npx with this latest build directly:

npx https://prerelease-registry.developers.workers.dev/runs/2247677395/npm-package-wrangler-866 dev path/to/script.js

[caass]

I didn't write any tests for this since the functionality is behind wrangler dev, which we don't have -- I did however ask @eidam if to try out a version with this fix implemented and it seems to work for his projects.

[eidam]

Workers project
https://stackblitz.com/edit/node-gpc6rx?file=package.json

Pages project
https://stackblitz.com/edit/github-w5ovsh?file=package.json

[caass]

For clarity: the @caass/wrangler package is just a version of this PR i published to NPM since stackblitz doesn't like git or URL deps

[JacobMGEvans]

This looks great to me!! Another big step in Wrangler support in atypical environments.
🥳🥳🥳

[d3lm]

Thanks for this PR 🙏 🙏 🙏

@caass We are working on git or url dependencies so hopefully that will work soonish.