Add a passThroughOnException() handler to Pages Functions

[GregBrimble]

Workers Types PR: cloudflare/workers-types#314

feat: Add a passThroughOnException() handler in Pages Functions

This passThroughOnException() handler is not as good as the built-in for Workers. We're just adding it now as a stop-gap until we can do the behind-the-scenes plumbing required to make the built-in function work properly.

We wrap your Pages Functions code in a try/catch and on failure, if you call passThroughOnException() we defer to the static assets of your project.

For example:

export const onRequest = ({ passThroughOnException }) => {
	passThroughOnException();
	x; // Would ordinarily throw an error, but instead, static assets are served.
};

[changeset-bot]

🦋 Changeset detected

Latest commit: 4a42336

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/3371303285/npm-package-wrangler-2111

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

npm install --save-dev https://prerelease-registry.developers.workers.dev/prs/2111/npm-package-wrangler-2111

Or you can use npx with this latest build directly:

npx https://prerelease-registry.developers.workers.dev/runs/3371303285/npm-package-wrangler-2111 dev path/to/script.js

Additional artifacts:

npm install https://prerelease-registry.developers.workers.dev/runs/3371303285/npm-package-cloudflare-pages-shared-2111

[codecov]

Codecov Report

Merging #2111 (4a42336) into main (71cc524) will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #2111      +/-   ##
==========================================
+ Coverage   73.17%   73.18%   +0.01%     
==========================================
  Files         128      128              
  Lines        8631     8631              
  Branches     2264     2264              
==========================================
+ Hits         6316     6317       +1     
+ Misses       2315     2314       -1     

Impacted Files	Coverage Δ
...ackages/wrangler/src/__tests__/helpers/mock-bin.ts	100.00% <0.00%> (+5.26%)	⬆️