feat: opt-in shared scope for micro-frontend setups - #191
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Included review availability: Your plan provides up to 2 included reviews per hour; 0 remain after this review. 📝 WalkthroughWalkthroughThe PR adds opt-in shared window state for micro-frontend bundles. It shares early initialization, OIDC instance context, and initialization values. It also changes esbuild integration and Windows path serialization in the build script. ChangesMicro-frontend shared state
Windows build path handling
Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: 🟡 Moderate · up to Opted-in micro-frontends will share authentication state through the browser window, so an untrusted or misbehaving same-page script can affect all participating bundles. The first bundle also determines security-related initialization settings, while mixed versions may leave competing authentication listeners active. Default behavior remains isolated, but these risks should be explicitly accepted and deployment compatibility enforced before merge. Sequence Diagram(s)sequenceDiagram
participant Host
participant oidcEarlyInit
participant sharedScope
participant createOidc
Host->>oidcEarlyInit: Set isMicroFrontendSetup
oidcEarlyInit->>sharedScope: Enable shared scope
oidcEarlyInit->>sharedScope: Get shared initialization state
createOidc->>sharedScope: Get shared global context
sharedScope-->>createOidc: Shared exports and instance cache
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Linked Issues checkExplanation The changes address issue
✨ Finishing Touches🧪 Generate unit tests (beta)
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Inline comments:
In `@scripts/build.ts`:
- Around line 225-234: Update the targetFormat === "esm" vendor bundling flow in
scripts/build.ts to invoke esbuild without a shell, replacing the run/execSync
command-string path with execFileSync or spawnSync and an argument array. Pass
filePath and bundledFilePath as separate arguments without shell quoting, while
preserving the existing flags and external-node-builtins arguments.
In `@src/core/sharedScope.ts`:
- Around line 87-94: Update getSharedState and the store-enable flow to track
enablement in module scope, requiring the current bundle’s local opt-in as well
as a compatible enabled window store before returning shared state; otherwise
return the provided obj. Ensure bundles that do not call the opt-in setup cannot
reuse entries such as earlyInitMemo or globalContext created by another bundle.
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scripts/build.tssrc/core/createOidc.tssrc/core/earlyInit.tssrc/core/earlyInit_BASE_URL.tssrc/core/earlyInit_rootRelativeOriginalLocationHref.tssrc/core/sharedScope.ts
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Each micro-frontend remote bundles its own copy of oidc-spa, so the module
scoped earlyInit state and instance cache exist once per bundle. The first
bundle's message listener swallows the other bundles' iframe auth responses
via stopImmediatePropagation, and the auth callback is consumed by whichever
bundle initialises first.
With oidcEarlyInit({ isMicroFrontendSetup: true }) that state is held on
window, so all bundles share one listener, one instance cache and one auth
callback. Shared state is resolved at use time so it cannot race against the
dynamic import of createOidc, reads never create the window global, and the
store carries a format version so mismatched bundles fall back to module
scope. Default behaviour is unchanged.
Also fixes two Windows build failures: the generated webpack config embedded
unescaped backslash paths, and esbuild was invoked with single quoted paths
that cmd.exe does not strip.
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1 participant
Closes #169
Opt-in fix for the multi-bundle problem discussed in #169: each micro-frontend remote bundles its own copy of oidc-spa, so the module scoped earlyInit state and instance cache exist once per bundle. The first bundle's message listener calls stopImmediatePropagation and swallows the other bundles' iframe auth responses, and the auth callback is consumed by whichever bundle initialises first.
oidcEarlyInit({ isMicroFrontendSetup: true }). When set, the earlyInit memo, the createOidc global context, and the BASE_URL / original-location stores live onwindowunder__oidc_spa_shared__, so all bundles share one listener, one instance cache, and one auth callback. Every participating bundle passes the flag.Verified in our production setup from #169 (React 17 host, Angular remote, React 19 remote, each bundling oidc-spa): with the flag on all three bundles the listener conflict and callback collisions are gone.
Summary by CodeRabbit
New Features
Bug Fixes