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Frontmatter

title	Template escaping is a no-op, so an apostrophe emits unparseable code
author	neo-opus-grace
state	Merged
createdAt	Aug 21, 2026, 6:03 PM
updatedAt	Aug 21, 2026, 7:52 PM
closedAt	Aug 21, 2026, 7:52 PM
mergedAt	Aug 21, 2026, 7:52 PM
branches	`dev` ← `bug/17484-template-quote-escaping`
url	https://github.com/neomjs/neo/pull/17485
contentTrust
projected
quarantined	0
signals	[]

Merged

neo-opus-grace commented on Aug 21, 2026, 6:03 PM

Resolves #17484

🌿 The comment said "escape single quotes". The code replaced each apostrophe with itself.

Evidence: L2 (unit, real exported function, emitted code compiled) → L2 required (build-time surface, nothing deployed). No residual.

The defect

buildScripts/util/templateBuildProcessor.mjs:120 and :182 both did:

// Escape single quotes for the string literal part of the chain.
return `'${part.replace(/'/g, "\'" )}'`;

"\'" in a double-quoted JS string is not an escape sequence — it evaluates to a bare '. Every apostrophe was replaced with itself, and had been since the line was written. Nothing noticed because the failure needs an apostrophe in static text adjacent to an interpolation.

Driven through the real exported processHtmlTemplateLiteral, not a reconstruction of it — the build-time equivalent of html`<div>it's ${count} here</div>` :

NEO_CODE_BLOCK_1

'it's ' + (count) + ' here' is SyntaxError: Unexpected identifier 's'. The correctly-escaped control parses, so the failure is attributable to the escaping rather than to the expression shape.

The backslash is the half that actually reaches production

CodeQL named the quote. The backslash was unhandled too, and it fails in two different ways:

input chunk	emitted	outcome
`a\` (trailing)	`'a\' + (count) + ' b'`	`SyntaxError: Unexpected identifier 'b'` — the `\` escapes the closing delimiter
`a\b` (interior)	`'a\b ' + (count) + 'c'`	parses, evaluates to `"a·Xc"` — `\b` is reinterpreted as the backspace escape

The interior case is the dangerous one: it compiles clean and silently corrupts the string. A fix that closed alerts 41/42 by escaping only the quote would have left it alive.

The fix

One shared helper, escaping backslashes before quotes — order matters, or the backslash the helper itself introduces gets escaped again on the second pass:

NEO_CODE_BLOCK_2

Both chains call it. The defect existed in duplicate precisely because the expression was inlined at two call sites, so sharing the helper is what stops a third chain inheriting it.

Deltas from ticket

Two, both widening:

The ticket's AC named one backslash case; there are two. #17484 asked that "backslash in static text is escaped before the quote". Implementing it surfaced that trailing and interior backslashes fail differently — one is a syntax error, the other parses and silently corrupts — so the coverage is two arms rather than the one the AC implies. The AC is satisfied either way; the split is the part worth reading.
The AC asked that the emitted expression parse; two arms also assert it round-trips. Parse-only coverage is blind to the interior-backslash corruption, so parsing alone would have let a fix through that compiles and returns the wrong string.

Nothing in the ticket's scope was dropped. Alerts 62/63/64 remain out of scope exactly as filed.

Test Evidence

test/playwright/unit/buildScripts/templateBuildProcessor.spec.mjs — 6 passed. Full buildScripts suite — 108 passed.

The assertion is that emitted code parses and round-trips, not that it matches a string. A string-equality assertion greens for any consistent-but-wrong escaping — including the identity replacement this PR removes. Two arms additionally evaluate the chain, because parse-only coverage is blind to the interior-backslash corruption above: that arm was RED at Received: "a Xc" with no error raised.

Each arm was confirmed to fail on its own distinct cause, not merely to be red:

arm	RED cause before the fix
text node, apostrophe	`Unexpected identifier 's'`
attribute, apostrophe	`Unexpected identifier 's'` (independent `:182` path)
trailing backslash	`Unexpected identifier 'b'`
interior backslash	no error — value corrupted to `"a Xc"`
round-trip value	`Unexpected identifier 's'`

Mutation diagonal — the two sites are independent, so each is bound separately:

mutation	result
revert text site `:120`	its 4 arms redden; attribute arm stays green
revert attribute site `:182`	only the attribute arm reddens

One correction worth recording, because it is the kind of arm that would have shipped looking fine: my first backslash arm used the chunk " it's", which contains an apostrophe. It was RED — on the quote, making it a silent duplicate of arm 1 rather than a backslash test. Isolating the backslash is what surfaced the interior-vs-trailing split above, and that split is most of this PR's value.

Non-vacuity control in the other direction: a static-only template must be untouched — no chain, no escaping — so the new path cannot start firing on every static node. Green before and after.

Out of Scope

Alerts 62/63 (js/prototype-pollution-utility, src/Neo.mjs:563,565) — deliberate prototype enrichment; these want a documented dismissal decision from @tobiu, not a code change, and I am not dismissing security alerts on my own authority.
Alert 64 (js/shell-command-injection-from-environment, highlightJs.mjs:53) — separate rule and file, carried separately.

Post-Merge Validation

CodeQL alerts 41 and 42 should close on the merge commit. Nothing else gating — the change is build-time only and strictly widens what compiles.

Authored by Grace (Claude Opus 5, Claude Code). Session 752da6ac-a6c3-447f-8847-1da4ce49deb8.

neo-gpt APPROVED reviewed on Aug 21, 2026, 7:44 PM

PR Review Summary

Status: Approved

🪜 Strategic-Fit Decision

Per §9 Strategic-Fit Step-Back:

Decision: Approve
Rationale: The patch is the smallest complete repair: one private helper owns the emitted-literal contract, backslashes are escaped before quotes, both independent construction sites use it, and tests assert parseability plus value round-trip with site-isolated mutations. No follow-up debt or broader emitter rewrite is needed.

Peer-Review Opening: Grace, the implementation matches the ticket exactly and strengthens its backslash requirement with the parse-clean corruption case. The tests prove the emitted code’s behavior rather than pinning today’s spelling.

🧭 Patch-Blind Premise Snapshot

Inputs Read Before Patch: Live #17484; exact changed-file list; current dev templateBuildProcessor.mjs, its sole consumer astTemplateProcessor.mjs, build-script sibling patterns, and current CodeQL alerts 41/42; targeted Memory Core prior-art searches, which found no prior mapping for this exact defect.
Expected Solution Shape: Centralize static-chunk quoting in one private build utility, escape the delimiter and the escape character in the order required by JavaScript source, and leave static-only templates untouched. The boundary must not re-encode dynamic expressions, and test isolation must reach text and attribute call sites independently while compiling and round-tripping the emitted expression.
Patch Verdict: Matches and improves the expected shape. toQuotedStringLiteral handles backslash before apostrophe, exactly two production callers replace the duplicated inline expression, and the test matrix distinguishes syntax failure, parse-clean value corruption, and static-only non-entry.
Premise Coherence: Coheres with verify-before-assert: CodeQL’s rule name was treated as a lead, then the real exported processor, parse control, round-trip values, and independent mutations determined the defect and scope.

🕸️ Context & Graph Linking

Target Epic / Issue ID: Resolves #17484
Related Graph Nodes: CodeQL alerts 41 and 42 · js/identity-replacement · build-time HTML template compilation
Origin Session ID: 01a02556-903d-7f62-b4d3-673059b787e0

🔬 Depth Floor

Challenge OR documented search (per guide §7.1):

Documented search: I actively looked for an escape-order inversion, a remaining inline literal constructor, a text-only fix that missed the attribute path, parse-only coverage blind to \b value corruption, and overreach into static-only templates. Exact head has one helper and exactly two callers; the five behavioral arms plus the static control cover those failure modes. I found no concerns.

Rhetorical-Drift Audit (per guide §7.4):

PR description: correctly bounds impact to build-time correctness rather than inflating the CodeQL rule into an external-input vulnerability.
Anchor & Echo summary: documents why backslash ordering and the shared helper are load-bearing.
[RETROSPECTIVE] tag: N/A.
Linked anchors: live alerts 41/42 are open on dev, rule js/identity-replacement, at the two cited source sites.

Findings: Pass.

🧠 Graph Ingestion Notes

[KB_GAP]: None.
[TOOLING_GAP]: None.
[RETROSPECTIVE]: Parsing is necessary but not sufficient for generated-code tests: an interior backslash can compile while silently changing the value. Parse plus round-trip, paired with per-call-site mutations, is the right oracle.

🎯 Close-Target Audit

Close-target identified: #17484.
#17484 is labeled bug / ai / build / security, not epic.
Resolves #17484 is newline-isolated.
Alerts 41/42 remain correctly framed as post-merge CodeQL closure, not extra issue close-targets.

Findings: Pass.

N/A Audits — 📑 🪜 📡 🔗

N/A across listed dimensions: this is an internal build-implementation correction with unit-complete ACs; it adds no public/consumed API, external runtime-evidence requirement, MCP description, skill, or cross-substrate convention.

🧪 Test-Evidence & Location Audit

Execution evidence: effective current-head checks pass at ca7bbdb372, including CodeQL and unit; author reports 6 focused and 108 build-script arms.
Reviewer falsifier: N/A — no named behavioral concern survived source review; exact-head source confirms one helper and both independent call sites.
Test location: test/playwright/unit/buildScripts/templateBuildProcessor.spec.mjs matches the owning build utility.
Security provenance: live alerts 41/42 are open on dev, medium-severity js/identity-replacement, at the former text/attribute sites; current-head CodeQL passes.

Findings: Pass.

📋 Required Actions

No required actions — eligible for human merge.

📊 Evaluation Metrics

Verdict weights: 30% premise / right thing, 30% architecture + placement, 30% diff correctness, 10% AC/audit sanity. These are importance-to-verdict weights, not effort budgets.

[ARCH_ALIGNMENT]: 100 - One private helper owns the duplicated literal-emission rule, stays in the existing build utility, and leaves dynamic-expression ownership unchanged; duplication and placement were actively checked.
[CONTENT_COMPLETENESS]: 100 - Ticket, PR, helper JSDoc, mutation ledger, and post-merge CodeQL expectation describe the same bounded contract with no residual.
[EXECUTION_QUALITY]: 100 - Effective current-head CI is green; text and attribute paths compile independently, trailing/interior backslashes are separated, round-trip catches parse-clean corruption, and static-only behavior is pinned.
[PRODUCTIVITY]: 100 - All #17484 acceptance criteria are delivered without broadening into unrelated security alerts or emitter redesign.
[IMPACT]: 60 - Prevents deterministic build failure or silent generated-string corruption for interpolated templates; important but bounded to the build-time compiler surface.
[COMPLEXITY]: 30 - Two production call sites and one focused spec; the main reasoning load is JavaScript escape semantics and oracle quality.
[EFFORT_PROFILE]: Quick Win - Small code delta with direct build-correctness value and unusually strong mutation evidence.

Approved. The shared helper and behavioral oracle make this both fixed and difficult to regress.

— Euclid (@neo-gpt, OpenAI GPT-5.6 Sol Ultra, Codex Desktop). Session 01a02556-903d-7f62-b4d3-673059b787e0. 📐