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[PR #4342] [MERGED] fix(javascript): preserve uncertainty in compound assignment results #6187
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opened 2026-10-31 01:12:32 +00:00 by bsakaguchi
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📋 Pull Request Information
Original PR: https://github.com/morluto/rea/pull/4342
Author: @maxazure
Created: 10/16/2026
Status: ✅ Merged
Merged: 10/16/2026
Merged by: @morluto
Base:
main← Head:fix/compound-assignment-paths-4206📝 Commits (7)
f03c800fix(javascript): preserve uncertainty in compound assignment results0e6b112fix(javascript): retain callable logical assignment alternatives26b6e7fMerge current main and validate guarded factory compatibility56753edfix(javascript): read prior module export assignment values95bed8ffix: keep mutable module export assignment candidates conservativeac4a1dffix: preserve mixed receiver values and wrapped assignment targets221ed54fix: carry mutable export uncertainty through copied values📊 Changes
4 files changed (+705 additions, -36 deletions)
View changed files
📝
src/domain/javascript/electronWrappedCallPaths.test.ts(+618 -0)📝
src/domain/javascript/javascriptSymbolicBindings.ts(+83 -36)📝
src/domain/javascript/javascriptSymbolicControlFlow.ts(+1 -0)📝
src/domain/javascript/javascriptSymbolicValues.ts(+3 -0)📄 Description
Summary
Fixes #4206. Preserve guarded IPC path alternatives when a compound assignment's result is not modeled, instead of pruning a branch using its right-hand side.
Problem and expected behavior
With
let flag = 1; if (flag -= 1), the symbolic evaluator used the literal RHS1and kept only the unguarded then-channel. The subtraction actually produces zero. A conservative static analysis must preserve the alternatives when it cannot evaluate the operation.Change and scope
Plain
=still evaluates its RHS. Arithmetic and bitwise compound assignment results become unknown. Logical assignments (&&=,||=,??=) use the existing logical-selection semantics and preserve selected or guarded callable alternatives. Stored namespace writes retain the full assignment node, so export-property writes andmodule.exportsreplacements use the same operator-aware evaluator. This removes the second place that stripped the operator.No arithmetic interpreter or target execution is added. This does not change the separate native-addon binding classifier addressed by #4338.
Contract and boundary impact
Expected effects:
Evidence and regression coverage
12 added static-analysis boundary cases cover inline arithmetic, bitwise and logical assignments, unknown operands, plain-assignment controls, and stored namespace property/replacement writes.
On base
42fc6c5, the new cases produce 8 failures with 57 passing existing/control cases. With the fix, all 65 pass.The exact three-case public CLI reproduction from #4206 was run before and after against inert extracted applications:
flag = 0stays else-only; unknown operand stays guarded both.Fixture JavaScript was never executed and Electron was not loaded.
Initial revision validation (
f03c800)Pinned Node 24.18.0 / npm 11.16.0, Linux:
npm run test:focused -- src/domain/javascript/electronWrappedCallPaths.test.ts src/domain/javascript/javascriptSymbolicBindings.test.ts src/domain/javascript/electronModuleInterop.test.ts src/domain/javascript/electronBundledRequireIdentity.test.ts— 332 passed.npm run build:cachedand exact issue CLI reproduction — passed before/after with results above.npm run check:fast— passed.npm run check— passed.npm run verify:test-discovery— 1,400 files discovered exactly once.An independent macOS arm64 review of the initial
f03c800head repeated the four focused suites (332 passed), check:fast, check, discovery (1,400 files), and the exact CLI before/after reproduction with the pinned toolchain. Baseline production plus the regression tests produced the expected 8 failures / 57 passes; the PR head passed all 65. Additional inert static probes for nested assignments, later plain writes, and returned-function branches passed. No code changes were needed.Review follow-up and CI preflight
The logical-assignment callable regression was reproduced with 11 failing cases before the follow-up. Fourteen added cases now cover RHS functions, resolvable LHS callables, skipped RHS and cyclic namespace reads. The focused suites passed 346 tests before syncing main.
After integrating main
2c75835(including guarded factory completion), the tested tree is4ff2da60:check:ci, discovery (1,414 files), Python (106 tests), andtest:prepare: passed.Before syncing main, a clean-install CI-faithful source plus five built-shard run accounted for all 1,400 files: 16,032 passed, 159 failed, 141 skipped. All failures reproduced on the old base. Cold static/build, docs, real JavaScript recovery (12 observations), and Inspector (8 variants) passed. That complete shard run applies to the pre-sync tree, not the current tree. The full five built shards were not repeated after syncing.
Local host/provider restrictions prevent claiming a fully green local suite. Windows cross-build and the complete installed-package gate were not run because the cross-compiler/artifacts were unavailable. GitHub CI on the new head is pending.
Known pre-existing limitation: prior mutable namespace LHS callables can be lost through last-write lookup; this follow-up restores guarded RHS candidates without adding flow-sensitive write tracking.
Compatibility, safety, and release
Author readiness
Human owner: @maxazure. Initial readiness was confirmed by the owner on 2026-10-16 for
f03c800; subsequent review fixes and their verification are recorded above.🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.