feat: unstable_subResourceIntegrity

[jacob-ebey]

Introduce unstable_subResourceIntegrity future flag that enables generation of an importmap with integrity for the scripts that will be loaded by the browser.

Available in 0.0.0-experimental-35027c3be

[changeset-bot]

🦋 Changeset detected

Latest commit: 1f21bdf

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

This PR includes changesets to release 11 packages

Name	Type
@react-router/dev	Patch
react-router	Patch
@react-router/fs-routes	Patch
@react-router/remix-routes-option-adapter	Patch
@react-router/architect	Patch
@react-router/cloudflare	Patch
react-router-dom	Patch
@react-router/express	Patch
@react-router/node	Patch
@react-router/serve	Patch
create-react-router	Patch

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[Copilot]

PR Overview

This PR introduces the "unstable_subResourceIntegrity" future flag to generate an importmap with integrity hashes for browser-loaded scripts. Key changes include generating an SRI manifest in the Vite plugin, updating manifest types and configurations to support the new flag, and modifying tests and playground configurations accordingly.

Reviewed Changes

File	Description
packages/react-router-dev/vite/plugin.ts	Adds SRI manifest generation and updates file system access.
.changeset/late-falcons-sort.md	Updates changeset with the new feature flag message.
playground/framework/react-router.config.ts	Enables the unstable flag in the playground configuration.
pnpm-lock.yaml	Updates dependency versions related to the changes.
playground/framework/app/root.tsx	Minor formatting adjustment.
packages/react-router/lib/dom/ssr/entry.ts	Extends FutureConfig to include the new flag.
packages/react-router/lib/dom/ssr/components.tsx	Renders SRI attributes in script and preload links.
packages/react-router-dev/manifest.ts	Updates the manifest type with an optional sri field.
packages/react-router-dev/config/config.ts	Propagates the new flag in configuration resolution.
packages/react-router/lib/dom/ssr/routes-test-stub.tsx	Updates test stub to reflect the new flag.

Copilot reviewed 10 out of 10 changed files in this pull request and generated 1 comment.

Comments suppressed due to low confidence (1)

packages/react-router-dev/vite/plugin.ts:823

• The 'recursive' option is not supported in fs.readdirSync. Consider using a dedicated recursive file walker or fs.promises API with recursion to traverse subdirectories.

let entries = fs.readdirSync(clientBuildDirectory, {