Bug report: Single fetch: Throwing a response stub with a 4xx status causes a turbo-stream error

[haines]

Throwing a response stub with a 4xx status causes an error, because turbo-stream attempts to serialize the response stub and fails when it hits the headers value, which is not serializable due to having a prototype of Headers.

Running the test included test case produces the following logs:

Error: Cannot encode object with prototype
    at Object.stringify (~/remix/node_modules/.pnpm/turbo-stream@2.0.0/node_modules/turbo-stream/dist/flatten.js:116:27)
    at Object.flatten (~/remix/node_modules/.pnpm/turbo-stream@2.0.0/node_modules/turbo-stream/dist/flatten.js:22:15)
    at ~/remix/node_modules/.pnpm/turbo-stream@2.0.0/node_modules/turbo-stream/dist/flatten.js:30:59
    at Array.map (<anonymous>)
    at partsForObj (~/remix/node_modules/.pnpm/turbo-stream@2.0.0/node_modules/turbo-stream/dist/flatten.js:30:10)
    at Object.stringify (~/remix/node_modules/.pnpm/turbo-stream@2.0.0/node_modules/turbo-stream/dist/flatten.js:113:38)
    at Object.flatten (~/remix/node_modules/.pnpm/turbo-stream@2.0.0/node_modules/turbo-stream/dist/flatten.js:22:15)
    at ~/remix/node_modules/.pnpm/turbo-stream@2.0.0/node_modules/turbo-stream/dist/flatten.js:30:59
    at Array.map (<anonymous>)
    at partsForObj (~/remix/node_modules/.pnpm/turbo-stream@2.0.0/node_modules/turbo-stream/dist/flatten.js:30:10)
    at Object.stringify (~/remix/node_modules/.pnpm/turbo-stream@2.0.0/node_modules/turbo-stream/dist/flatten.js:113:38)
    at Object.flatten (~/remix/node_modules/.pnpm/turbo-stream@2.0.0/node_modules/turbo-stream/dist/flatten.js:22:15)
    at ~/remix/node_modules/.pnpm/turbo-stream@2.0.0/node_modules/turbo-stream/dist/flatten.js:30:59
    at Array.map (<anonymous>)
    at partsForObj (~/remix/node_modules/.pnpm/turbo-stream@2.0.0/node_modules/turbo-stream/dist/flatten.js:30:10)
    at Object.stringify (~/remix/node_modules/.pnpm/turbo-stream@2.0.0/node_modules/turbo-stream/dist/flatten.js:113:38)
    at Object.flatten (~/remix/node_modules/.pnpm/turbo-stream@2.0.0/node_modules/turbo-stream/dist/flatten.js:22:15)
    at Object.start (~/remix/node_modules/.pnpm/turbo-stream@2.0.0/node_modules/turbo-stream/dist/turbo-stream.js:123:45)
    at setupReadableStreamDefaultController (node:internal/webstreams/readablestream:2342:23)
    at setupReadableStreamDefaultControllerFromSource (node:internal/webstreams/readablestream:2375:3)
    at new ReadableStream (node:internal/webstreams/readablestream:286:7)
    at Object.encode (~/remix/node_modules/.pnpm/turbo-stream@2.0.0/node_modules/turbo-stream/dist/turbo-stream.js:121:22)
    at Object.encodeViaTurboStream (~/remix/build/node_modules/@remix-run/server-runtime/dist/single-fetch.js:395:22)
    at handleDocumentRequest (~/remix/build/node_modules/@remix-run/server-runtime/dist/server.js:288:40)
    at requestHandler (~/remix/build/node_modules/@remix-run/server-runtime/dist/server.js:142:18)
    at file://~/remix/integration/bug-report-test.ts:140:18

[changeset-bot]

⚠️ No Changeset found

Latest commit: 4c0c6cc

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

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

[brophdawg11]

Thank you for the bug report! This should be handled by #9501