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…closing function `r = Range(); def inner(): return r.reset()` resolved `r.reset()` only while `reset` was a project-unique name: a nested function's local-type map held its own bindings and parameters alone. Once `Other` also defined `reset` the call got no edge, and inside a method, whose nested calls are not attributed to it, the call was linked nowhere. Python, JavaScript and TypeScript alike (#3200). A Python, JS or TS caller's map is now seeded with the own-scope types of each enclosing function, innermost first, below its own bindings: - a name the nested function binds itself (a parameter, a declaration, a loop or catch variable, a plain JS assignment, a Python `global`/`nonlocal`) is not captured, and neither is a name a function in between binds; - JS/TS reads only the declarations the enclosing function makes itself (`own_scope_variable_types`), so a sibling's same-named local cannot lend its type; Python's map was already the body's own (#1922); - each enclosing function's types are memoised for the module being walked, so its nested callers share one build. Fixes #3200
…names The captured-variable pass listed the nested caller's own bindings before it knew there was an enclosing function to capture from, so every top-level function and method paid for a walk of its body for nothing. It now returns at once when the caller has no enclosing function. The dispatch tests hand the type map a bare mock, whose `parent` is another mock forever: the walk to an enclosing function never ended and the worker ran out of memory. Their stand-in node is now a top-level one (`parent` is None), as every real tree's root is. Refs #3200
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| Layer / File(s) | Summary |
|---|---|
Collect function-local bindings codebase_rag/parsers/js_ts/utils.py, codebase_rag/parsers/js_ts/type_inference.py, codebase_rag/parsers/py/ast_analyzer.py |
Python and JavaScript/TypeScript helpers identify names bound within a function. The JavaScript/TypeScript inference engine builds scoped type maps for variable declarations and accounts for plain and augmented writes. |
Build and overlay captured type maps codebase_rag/parsers/type_inference.py |
Type inference caches enclosing function type maps, excludes names bound in the current or an intermediate function, and overlays remaining captured types beneath the current function’s bindings. |
Verify captured-variable resolution codebase_rag/tests/test_closure_captured_local_types.py, codebase_rag/tests/test_type_inference_iterative.py |
Tests cover captured-variable call edges and rebinding cases across Python, JavaScript, and TypeScript. The iterative test mock now sets its parent explicitly. |
Estimated code review effort: 3 (Moderate) | ~25 minutes
Change: Bug fix · Severity of issue fixed: Medium
Sequence Diagram(s)
sequenceDiagram
participant NestedFunction
participant TypeInferenceEngine
participant ScopeNameAnalysis
participant EnclosingTypeMap
NestedFunction->>TypeInferenceEngine: Build function type map
TypeInferenceEngine->>ScopeNameAnalysis: Find names bound in nested and intermediate scopes
ScopeNameAnalysis-->>TypeInferenceEngine: Return shadowed names
TypeInferenceEngine->>EnclosingTypeMap: Collect nearest eligible captured types
EnclosingTypeMap-->>TypeInferenceEngine: Return captured bindings
TypeInferenceEngine-->>NestedFunction: Use captured types beneath local bindings
Possibly related PRs
- vitali87/code-graph-rag#3492: Changes Python scope facts used to identify names bound in nested functions.
- vitali87/code-graph-rag#3521: Resolves Python calls through reaching bindings, which can interact with captured and rebound names.
- vitali87/code-graph-rag#3495: Changes the Python scope walk used when filtering captured names.
Suggested reviewers: claude
Merge Risk: 
a7040
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The previously reported incorrect call edges and missing interface-parameter capture appear addressed. No outstanding issue identified here prevents merging after normal checks.
Pre-merge checks: 
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Check name Status Explanation Title check The title clearly and concisely describes the primary change: typing variables captured by nested functions from enclosing functions. Description check The description includes the required Summary, Demo, Type of Change, Related Issues, Test Plan, and Checklist sections. It explains the fix, test coverage, manual demonstration, and remaining full-sui… Linked Issues check Issue #3200requires captured types in nested Python, JavaScript, and TypeScript functions and arrows.TypeInferenceEngine._captured_variable_typesadds enclosing-function bindings in nearest-first …Out of Scope Changes check The production changes, scope helpers, memoization, closure tests, and top-level mock fixture update support issue #3200. The evidence shows no critical, major, or high-severity unrelated change.Full details: Description check
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Explanation
The description includes the required Summary, Demo, Type of Change, Related Issues, Test Plan, and Checklist sections. It explains the fix, test coverage, manual demonstration, and remaining full-suite test status. The unchecked pre-commit item is non-critical because the description records equivalent Ruff and ty checks.
Full details: Linked Issues check
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Explanation
Issue
#3200requires captured types in nested Python, JavaScript, and TypeScript functions and arrows.TypeInferenceEngine._captured_variable_typesadds enclosing-function bindings in nearest-first order. The merge preserves caller bindings and excludes names bound by the nested or intervening function. JavaScript and TypeScript scope analysis handles declarations, patterns, loop and catch variables, block scopes, and writes. Python analysis handles parameters,global,nonlocal, and intervening bindings. The new tests cover exactRange.resetedges, method callbacks, interface parameters, multiple nesting levels, rebinding negatives, sibling scopes, and unchanged direct calls.
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Reviewed commit: 685a23feda
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 [Medium impact] The change affects call resolution for nested functions across four language families. Fix the JS/TS block filtering and conflicting Python capture types before merging. FindingsSummaryAdds captured-variable types for nested Python, JavaScript, TypeScript, and TSX functions.
Reviews (4) · Last reviewed commit: "Merge branch 'main' into claude/captured..." · Reviewed by Greptile |
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I checked this branch (685a23f) against #3200's repro: all four nested callers now reach
One case adds a new wrong
mkdir cap && cd cap && git init -q
cat > cap.ts <<'EOF'
class Range { reset(): number { return 1; } }
class Other { reset(): number { return 2; } }
export function outer(flag: boolean): () => number {
const r = new Range();
if (flag) {
const r = new Other();
r.reset();
}
const f = (): number => r.reset();
return f;
}
EOF
git add -A && git -c user.email=x@x -c user.name=x commit -qm init
cgr -q start --repo-path . --update-graph
cgr -q graph callees "$(cgr -q graph resolve outer.f | jq -r '.[0].qualified_name')" | jq -r '.[] | "\(.path):\(.line) -> \(.qualified_name | split(".") | .[-2:] | join(".")) \(.resolution)"'
# main: (nothing: `reset` is defined twice, so the untyped capture gets no edge)
# PR #3331: cap.ts:10 -> Other.reset exact <- `f` captures the function-level `r`, a Range
The flat per-function map has the same problem for a function's own calls, which I filed separately as #3332. Here, though, the scope is known and cheap to apply: only declarations whose enclosing block (or Generated by Claude Code |
…names SonarCloud S3776: the function was at 35 (15 allowed); with each node's bindings read in _js_ts_names_bound_by it is 7. Behaviour is unchanged: checked against the previous version on 13k parsed JS/TS function nodes.
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@greptile review |
Tested 1 flow, found no issues. What we tested
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Resolves conflicts with main's Go qualified-local and interface-parameter seeding work: both sides added independent helpers to TypeInferenceEngine and JsTypeInferenceEngine, so each keeps both.
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Inline comments:
Review comments at @codebase_rag/parsers/js_ts/type_inference.py:
- Around line 371-373: Update the method containing this stack initialization to
seed the capture map with enclosing function parameters typed as first-party
interfaces before walking body declarators. Preserve the existing body traversal
so nested callbacks can resolve calls such as r.reset() using the parameter’s
interface type.
- Around line 378-379: Update declaration selection around `_record_declarator`
so captured variables resolve to the declaration visible in the callback’s
lexical scope, rather than a later declaration in a sibling block. Preserve
function-scoped `var` binding behavior so `var` declarations remain visible
throughout their containing function.
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codebase_rag/parsers/js_ts/type_inference.pycodebase_rag/parsers/js_ts/utils.pycodebase_rag/parsers/type_inference.pycodebase_rag/tests/test_type_inference_iterative.py
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…sible The enclosing function's map flattened every declarator in its body, so a `const r` in a sibling block (or one declared after the block around the nested function) replaced the `r` the nested function actually reads and gave its `r.reset()` an exact edge to the wrong class. Key the enclosing function's bindings by the span each holds in, using the existing JS binding index, and read only the spans around the caller, innermost first; a `var` still holds in the whole function.
`const cb = function r() { r.reset(); }` binds `r` to the function itself
inside its body, shadowing an enclosing `r`, but its own-scope names held
only its parameters and body bindings, so the enclosing `Range` was lent to
the self name and `r.reset()` got an exact edge to `Range.reset`.
`outer(r: IRange)` types `r` by its first-party interface in its own map (#2524), but the bindings a nested callback captures came from body declarators alone, so the callback's `r.reset()` lost the typed edge `outer` itself gets. Seed the interface parameters into the enclosing function's whole-span bindings; a `var` redeclaring one still wins.
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@greptile review |
Brings main's security fixes onto the branch: certifi 2026.10.23 and grpcio 1.84.1 (PYSEC-2026-4320 and the distrusted eMudhra/emSign roots), the emSign root distrust in the build images and CI, virtualenv 21.14.13, opentelemetry-api 1.45.1 and mcp 1.30.0.
…h enclosing def with its own class Two ways a nested function was handed the wrong class (Greptile on #3331): - JS/TS: `let r = new Range(); r = new Other();` left the captured `r` typed `Range`, though `inner` may run after the write. A typed binding now keeps its type only while every plain write to it (`r = v`, `r ??= v`), in the enclosing body or in a nested function that does not declare its own `r`, infers to the same class; otherwise it keeps the declared annotation, if any, else no type. - Python: an enclosing def's map was built with the caller's class, so for a method of a class defined inside that def, the def's `self` was typed as the inner class, and the memo kept whichever caller came first. Each enclosing def now gets the class around it, derived from the caller's by dropping one qualified-name segment per def and class passed, and the memo is keyed on it.
…h enclosing def with its own class Two ways a nested function was handed the wrong class (Greptile on #3331): - JS/TS: `let r = new Range(); r = new Other();` left the captured `r` typed `Range`, though `inner` may run after the write. A typed binding now keeps its type only while every plain write to it (`r = v`, `r ??= v`), in the enclosing body or in a nested function that does not declare its own `r`, infers to the same class; otherwise it keeps the declared annotation, if any, else no type. - Python: an enclosing def's map was built with the caller's class, so for a method of a class defined inside that def, the def's `self` was typed as the inner class, and the memo kept whichever caller came first. Each enclosing def now gets the class around it, derived from the caller's by dropping one qualified-name segment per def and class passed, and the memo is keyed on it. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01ChfULvr1gXZn6MQXr4xNFS
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…h enclosing def with its own class Two ways a nested function was handed the wrong class (Greptile on #3331): - JS/TS: `let r = new Range(); r = new Other();` left the captured `r` typed `Range`, though `inner` may run after the write. A typed binding now keeps its type only while every plain write to it (`r = v`, `r ??= v`), in the enclosing body or in a nested function that does not declare its own `r`, infers to the same class; otherwise it keeps the declared annotation, if any, else no type. - Python: an enclosing def's map was built with the caller's class, so for a method of a class defined inside that def, the def's `self` was typed as the inner class, and the memo kept whichever caller came first. Each enclosing def now gets the class around it, derived from the caller's by dropping one qualified-name segment per def and class passed, and the memo is keyed on it. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01ChfULvr1gXZn6MQXr4xNFS
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@greptile review |
| ): | ||
| captured.setdefault(name, type_name) | ||
| hidden.update(bindings[span]) | ||
| hidden |= self._own_scope_names(scope, language) |
There was a problem hiding this comment.
_captured_variable_types hides names from every block in an intermediate function, even blocks that do not contain the callback. For example, outer declares const r = new Range(), mid contains { let r; }, and mid.inner calls r.reset() outside that block.
The block span is correctly excluded, but this line adds r back to hidden. inner loses the captured type, so its call cannot resolve when both Range and Other define reset. For JS/TS, hide only bindings whose scope contains the callback.
| bindings = { | ||
| (scope.start_byte, scope.end_byte): ( | ||
| self.python_type_inference.build_local_variable_type_map( | ||
| scope, module_qn, class_context | ||
| ) | ||
| ) |
There was a problem hiding this comment.
Python callbacks inherit one type even when different assignments can give the captured variable different classes. For example, outer(flag) assigns r = Range(), conditionally assigns r = Other(), then returns inner, whose body calls r.reset().
The enclosing builder stores one class for r, and this capture path gives that class to inner for both values of flag. The call is marked exact to one method even though the other can run. Keep the possible types or leave conflicting captured bindings untyped instead of lending one flat-map result.
Summary
r = Range(); def inner(): return r.reset(),r.reset()resolved only whileresetwas a project-unique name. Each caller's local-type map held only its own bindings and parameters, so onceOtheralso definedreset, the nested call got no edge.dead-codemisses helpers only a dead closure calls; methods are handled correctly #2688's duplicate on the enclosing function.Owner.method.cb).TypeInferenceEngine.build_local_variable_type_mapseeds a Python, JS or TS caller's map with the types its enclosing functions give their own variables, innermost first. They sit below the caller's own bindings and above the class-field overlay.global/nonlocal. Neither is a name bound by a function in between.own_scope_variable_types. The caller map is flat, so a sibling's same-named local would win whichever came last. Python's map was already the body's own (A nested def's local binding leaks into the enclosing function's type map, mistyping an outer receiver #1922).js_ts_own_scope_namesandpy.ast_analyzer.own_scope_nameslist each function's own bindings. The Python helper deliberately leaves out the enclosing defs that_locally_bound_namesincludes.Demo
The GIF plays the session step by step on the issue's
closurerepo.r = Range()/const r = new Range()sits in the enclosing function, andr.reset()is in a nested def, a nested function, a named arrow and an arrow inside a method;Otheralso definesreset. The repo is indexed withcgr startagainst Memgraph, then the demo lists the callers of eachreset.a.outerandb.outercallRange.reset, and nothing callsOther.reset.Owner.method.cb's call is linked nowhere.a.outer.inner,b.outer.inner,b.outer.viaArrowandb.Owner.method.cball callRange.reset(exact), and nothing callsOther.reset. The new tests pass.Type of Change
Related Issues
Fixes #3200
Test Plan
make test): related suites run, full suite see belowRed/green TDD in
codebase_rag/tests/test_closure_captured_local_types.py. Each test indexes real Python, JS or TS sources in which bothRangeandOtherdefinereset.test_a_nested_function_types_a_captured_variable(9 cases), each expecting{Range.reset (exact)}:py-nested-def,py-def-in-method,py-two-levels-up,py-annotated-parameter;ts-nested-function,ts-named-arrow,ts-arrow-in-method;js-nested-function, andjs-sibling-declares-the-name-too, where a sibling'sconst r = new Other()must not lend its type.test_a_name_the_nested_function_binds_is_not_captured(9 cases). The capturedRangenever applies:Other.reset), own parameter,global r, an untyped rebinding in a function in between, a sibling's local;Other.reset), an arrow parameter, a destructured parameter, a reassignment inside the nested function.test_the_enclosing_functions_own_call_is_unchanged.globalnot counted.test_type_inference_iterative.py's dispatch tests hand the type map a bareMagicMock, whoseparentis another mock forever. The walk to an enclosing function never ended, and the worker ran out of memory. Their stand-in node is now a top-level one (parentis None), as every real tree's root is.Checklist
StrEnum)# type: ignore,cast(),Any, orobjecttype hints🤖 Generated with Claude Code
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