[frontegg-david]

Stack 2/10: main ← #92 ← this ← #94 ← #95 ← #96 ← #98 ← #99 ← #100 ← #101 ← #102

Fixes #88.

Validation

Reproduced. new BrowserEnclave({ globals: { double: (n) => n * 2, label: 'ok' } }) constructed fine. run('return [typeof double, label];') returned ["undefined", "ok"]. serializeGlobals() (libs/browser/src/browser-enclave.ts:378) skipped functions, and also BigInt and circular values (its catch {}). Meanwhile Object.keys(globals) still went to the validator as allowed names. Core throws at construction for the same option (Custom global "double" contains a function at root ...).

Fix

• serializeGlobals now throws instead of skipping. The error names the global:
  • A function at any depth: Custom global "double" is a function / Custom global "utils" contains a function at key "double". The message points to toolHandler and toolNamespaces.
  • A symbol, a BigInt or a circular structure: Custom global "x" cannot be passed into the sandbox: ....
• The constructor calls it once, so the error comes before any script runs. run() still serializes on every run, so hosts that update a global between runs keep working (covered by a test).
• allowFunctionsInGlobals is documented as having no effect in the browser. Functions never cross the iframe boundary, so the constructor throws whatever the option says.

Behavior change

A BrowserEnclave with a function, symbol, BigInt or circular value in globals now throws at construction. Before, the value was dropped and the script saw undefined. JSON data globals are unchanged.

Red → green

libs/browser/e2e/globals.spec.ts (new, 8 tests). Before: 6 failed. The 2 that passed are guards: JSON globals still reach the script, and host updates between runs are picked up. After: 8 passed.

Review follow-ups (d71c279)

• toJSON() could hide a function (Copilot). Globals are now checked on the original value before JSON.stringify runs, walking the own enumerable properties JSON would copy, so { cfg: { fn, toJSON() {...} } } throws (contains a function at "fn"). The walk also refuses objects JSON would turn into {} (Map, Set, RegExp, DOM nodes, ...), and errors now carry the full path (at "hooks.0.run"). Plain objects, class instances, arrays and Dates (as ISO strings) still pass.
• An undefined global was dropped while its name stayed allowed (CodeRabbit). It now throws at construction.
• 6 new e2e tests (globals.spec.ts: 13 total); the three behavior cases fail on the first commit.

Verification

• npx nx run browser:test-e2e: 72 passed
• nx lint browser, nx build browser, prettier: pass

🤖 Generated with Claude Code

Summary by CodeRabbit

• Behavior Changes
  • Browser custom globals must contain JSON-serializable data. Enclave construction now fails with an error identifying the global when it contains functions, symbols, BigInts, or circular references.
  • allowFunctionsInGlobals does not enable functions in browser globals; functions cannot cross the iframe boundary.
  • JSON-compatible globals are refreshed for each run, so host-side changes are reflected in subsequent enclave scripts.
• Documentation
  • Clarified browser global requirements and updated examples to show that function globals cause construction to fail.

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📝 Walkthrough

Walkthrough

BrowserEnclave now rejects custom globals that cannot be represented as JSON during construction. It serializes supported globals again for each run. The browser configuration reference and end-to-end tests describe and verify this behavior.

Changes

Browser globals

Layer / File(s)	Summary
Global serialization and validation libs/browser/src/browser-enclave.ts, libs/browser/src/types.ts, libs/browser/e2e/globals.spec.ts, docs/enclave/core-libraries/enclave-browser/configuration.mdx	Construction now throws for globals containing functions or symbols, BigInts, or circular structures. Tests cover these errors, including functions nested in objects or arrays and functions when allowFunctionsInGlobals is enabled. Documentation describes the browser behavior and directs users to expose host functions through tools.
Per-run global transfer libs/browser/src/browser-enclave.ts, libs/browser/e2e/globals.spec.ts	Each run serializes the current globals for iframe configuration. Tests check that JSON-compatible values reach enclave scripts and that a host-side update is visible on a later run.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix · Severity of issue fixed: Medium

Merge Risk: 🔵 Low · up to 465fc

Globals set to undefined are silently dropped instead of rejected. This is a minor gap and mergeable, but it is worth fixing for consistency with the new strict behavior.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 66.67% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 3 functions across 3 files. (1 skipped: 1…	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Issue #88 requires a clear construction-time failure for function-valued globals. BrowserEnclave calls serializeGlobals() in its constructor before registering custom names with the validator. `st…
Out of Scope Changes check	✅ Passed	The serializer changes, end-to-end tests, and documentation all support issue #88 by preventing silent loss of globals and explaining browser limitations. Checks for symbols, BigInts, and circular val…
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main change: browser construction now rejects function-valued globals.

Full details: Docstring Coverage

Explanation

Docstring coverage is 66.67% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 3 functions across 3 files. (1 skipped: 1 unsupported.)

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Actionable comments posted: 1

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Inline comments:
Review comments at @libs/browser/src/browser-enclave.ts:
- Around line 148-150: Update the globals serialization logic in the constructor
to throw when JSON.stringify returns undefined, rather than silently omitting
the global; preserve serialization for values that produce JSON.

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ℹ️ Review info

⚙️ Run configuration

• Configuration used: Repository: agentfront/enclave/.coderabbit.yaml
• Review profile: CHILL
• Plan: Essentials
• Run ID: 348aa4b9-1ad3-45a1-be83-879953623049

📥 Commits

Reviewing files that changed from the base of the PR and between 6f04820 and 465fc21.

📒 Files selected for processing (4)

• docs/enclave/core-libraries/enclave-browser/configuration.mdx
• libs/browser/e2e/globals.spec.ts
• libs/browser/src/browser-enclave.ts
• libs/browser/src/types.ts

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[Copilot]

Copilot review overview

🟡 Changes recommended

Custom toJSON methods can hide functions from the new validation and preserve the silent-dropping bug.

Review effort: Balanced
Findings: 1

Open (1)

• Validate original value graph before JSON.stringify invokes toJSON · New

What changed in this PR

Adds fail-fast validation for browser globals that cannot cross the iframe boundary.

Changes:

• Rejects function, symbol, BigInt, and circular globals during construction.
• Re-serializes globals before each run to preserve host updates.
• Adds browser tests and updates configuration documentation.

File	Description
libs/​browser/​src/​types.ts	Documents browser global restrictions.
libs/​browser/​src/​browser-enclave.ts	Adds fail-fast global serialization.
libs/​browser/​e2e/​globals.spec.ts	Tests rejection and supported globals.
docs/​enclave/​core-libraries/​enclave-browser/​configuration.mdx	Documents changed behavior.

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