fix(resolver): require invocation evidence for object-literal value-ref liveness

crates/codegraph-core/src/domain/graph/builder/stages/build_edges.rs

@@ -153,10 +153,18 @@ struct EdgeContext<'a> {
     nodes_by_file: HashMap<&'a str, Vec<&'a NodeInfo>>,
     builtin_set: HashSet<&'a str>,
     receiver_kinds: HashSet<&'a str>,
+    /// Property/method names ever invoked via member-call syntax
+    /// (`x.name(...)`) across every file in this build pass — see
+    /// `collect_invoked_property_names` for the #1895 liveness rationale.
+    invoked_property_names: HashSet<&'a str>,
 }
 
 impl<'a> EdgeContext<'a> {
-    fn new(all_nodes: &'a [NodeInfo], builtin_receivers: &'a [String]) -> Self {
+    fn new(
+        all_nodes: &'a [NodeInfo],
+        builtin_receivers: &'a [String],
+        files: &'a [FileEdgeInput],
+    ) -> Self {
         let mut nodes_by_name: HashMap<&str, Vec<&NodeInfo>> = HashMap::new();
         let mut nodes_by_name_and_file: HashMap<(&str, &str), Vec<&NodeInfo>> = HashMap::new();
         let mut nodes_by_file: HashMap<&str, Vec<&NodeInfo>> = HashMap::new();
@@ -177,8 +185,43 @@ impl<'a> EdgeContext<'a> {
             nodes_by_file,
             builtin_set,
             receiver_kinds,
+            invoked_property_names: collect_invoked_property_names(files),
+        }
+    }
+}
+
+/// Collect the set of property/method names ever invoked via member-call
+/// syntax (`x.name(...)`) across every file currently being processed —
+/// regardless of whether the receiver `x` itself resolves to anything.
+///
+/// Used as the "one hop further" liveness check for object-literal-property
+/// value-refs (#1895): a function referenced as `{ resolve: someFn }` should
+/// only be credited with a `calls` edge from that reference when something,
+/// somewhere, actually invokes a `.resolve(...)`-shaped call — otherwise the
+/// property is wired up but never read, and `someFn` is genuinely dead.
+///
+/// Scope matches whatever `files` the caller passes to `build_call_edges`:
+/// the full codebase for a full build, or just the changed file(s) on an
+/// incremental one. The incremental case is a narrower, same-build-pass view
+/// (a cross-file consumer added in an untouched file won't be seen until the
+/// next full rebuild) — the same scoping trade-off already accepted
+/// elsewhere in this codebase's incremental classification
+/// (`has_active_file_siblings` and exported-via-reexport both recompute from
+/// the affected file set only, not the whole graph, in
+/// `graph/classifiers/roles.rs`'s incremental path — median fan-in/out is a
+/// separate case, deliberately kept as a whole-graph statistic even on the
+/// incremental path, for classification-threshold consistency). Mirrors
+/// `collectInvokedPropertyNames` in `src/domain/graph/builder/call-resolver.ts`.
+fn collect_invoked_property_names(files: &[FileEdgeInput]) -> HashSet<&str> {
+    let mut names = HashSet::new();
+    for file in files {
+        for call in &file.calls {
+            if call.receiver.is_some() {
+                names.insert(call.name.as_str());
+            }
         }
     }
+    names
 }
 
 // ── Phase 8.3: points-to analysis ─────────────────────────────────────────
@@ -467,7 +510,7 @@ pub fn build_call_edges(
     builtin_receivers: Vec<String>,
     max_iterations: u32,
 ) -> Vec<ComputedEdge> {
-    let ctx = EdgeContext::new(&all_nodes, &builtin_receivers);
+    let ctx = EdgeContext::new(&all_nodes, &builtin_receivers, &files);
     let mut edges = Vec::new();
 
     for file_input in &files {
@@ -800,6 +843,17 @@ fn process_file<'a>(
         // resolveFallbackTargets (stages/build-edges.ts).
         if call.dynamic_kind.as_deref() == Some("value-ref") {
             targets.retain(|t| t.kind == "function" || t.kind == "method" || t.kind == "class");
+            // #1895: object-literal-property value-refs (key_expr set — see
+            // handle_object_literal_pair_value_ref / shorthand handler)
+            // additionally require independent evidence that the property is
+            // actually invoked somewhere (`x.key_expr(...)`) — merely being
+            // wired into an object literal is not liveness. instanceof/Lua
+            // value-refs never set key_expr, so they are unaffected.
+            if let Some(key_expr) = call.key_expr.as_deref() {
+                if !ctx.invoked_property_names.contains(key_expr) {
+                    targets.clear();
+                }
+            }
         }
         sort_targets_by_confidence(&mut targets, fc.rel_path, imported_from);
         emit_call_edges(&targets, caller_id, is_dynamic, fc.rel_path, imported_from, &mut seen_edges, &mut pts_edge_map, edges);
@@ -1653,6 +1707,7 @@ fn emit_hierarchy_edges(
     }
 }
 
+
 // ── Import edges (native) ──────────────────────────────────────────────
 
 #[napi(object)]
@@ -2989,6 +3044,72 @@ mod call_edge_tests {
         assert_eq!(re.target_id, 2, "receiver edge target should be Calculator (id=2)");
     }
 
+    /// Issue #1895: an object-literal-property value-ref call whose property
+    /// key (`key_expr`) is never independently confirmed to be invoked
+    /// anywhere (`x.resolve(...)`) must NOT produce a `calls` edge — merely
+    /// being wired into the object literal is not liveness. A sibling
+    /// property whose key IS invoked elsewhere (`table.reject(...)`) keeps
+    /// its edge.
+    #[test]
+    fn value_ref_edge_requires_key_invoked_elsewhere() {
+        let all_nodes = vec![
+            node(1, "makeTable", "function", "factory.js", 1),
+            node(2, "neverRead",  "function", "factory.js", 2),
+            node(3, "isRead",     "function", "factory.js", 3),
+            node(4, "run",        "function", "consumer.js", 1),
+        ];
+
+        let mut resolve_call = call("neverRead", 5, None);
+        resolve_call.dynamic = Some(true);
+        resolve_call.dynamic_kind = Some("value-ref".to_string());
+        resolve_call.key_expr = Some("resolve".to_string());
+
+        let mut reject_call = call("isRead", 6, None);
+        reject_call.dynamic = Some(true);
+        reject_call.dynamic_kind = Some("value-ref".to_string());
+        reject_call.key_expr = Some("reject".to_string());
+
+        let factory_file = make_file(
+            "factory.js",
+            10,
+            vec![def("makeTable", "function", 1, 8)],
+            vec![resolve_call, reject_call],
+            vec![],
+            vec![],
+        );
+
+        // Evidence that `.reject(...)` is genuinely invoked somewhere, but
+        // `.resolve(...)` never is.
+        let consumer_file = make_file(
+            "consumer.js",
+            20,
+            vec![def("run", "function", 1, 3)],
+            vec![call("reject", 2, Some("table"))],
+            vec![],
+            vec![],
+        );
+
+        let edges = build_call_edges(
+            vec![factory_file, consumer_file],
+            all_nodes,
+            vec![],
+            MAX_SOLVER_ITERATIONS,
+        );
+
+        let calls_never_read = edges.iter().any(|e| e.kind == "calls" && e.target_id == 2);
+        let calls_is_read = edges.iter().any(|e| e.kind == "calls" && e.target_id == 3);
+        assert!(
+            !calls_never_read,
+            "expected no calls edge to neverRead (key 'resolve' never invoked); got: {:?}",
+            edges.iter().map(|e| (&e.kind, e.source_id, e.target_id)).collect::<Vec<_>>()
+        );
+        assert!(
+            calls_is_read,
+            "expected a calls edge to isRead (key 'reject' invoked in consumer.js); got: {:?}",
+            edges.iter().map(|e| (&e.kind, e.source_id, e.target_id)).collect::<Vec<_>>()
+        );
+    }
+
     /// Regression: when the same file has a `kind="function"` node for the
     /// effective receiver created by a destructured import (e.g.
     /// `const { Calculator } = require('./utils')`), that import artifact must

crates/codegraph-core/src/extractors/javascript.rs

@@ -2929,6 +2929,12 @@ fn extract_callback_reference_calls(
 /// (`{ name: SOME_CONSTANT }`) naturally fail to resolve into an edge rather
 /// than needing a structural allowlist gate here.
 ///
+/// `key_expr` carries the property KEY (e.g. `resolve`), distinct from `name`
+/// (the referenced value's own identifier, e.g. `someFunction`) — the
+/// downstream "is this property ever invoked" liveness check (#1895) needs
+/// the key, since that's the name a dispatch consumer would actually call
+/// (`table.resolve(...)`), not the function's own declared name.
+///
 /// Mirrors `collectObjectLiteralValueRefCall` in `src/extractors/javascript.ts`.
 fn handle_object_literal_pair_value_ref(node: &Node, source: &[u8], calls: &mut Vec<Call>) {
     let Some(value_n) = node.child_by_field_name("value") else { return };
@@ -2939,11 +2945,13 @@ fn handle_object_literal_pair_value_ref(node: &Node, source: &[u8], calls: &mut
     if JS_BUILTIN_GLOBALS.contains(&text) {
         return;
     }
+    let key_expr = node.child_by_field_name("key").and_then(|k| resolve_pair_key_name(&k, source));
     calls.push(Call {
         name: text.to_string(),
         line: start_line(&value_n),
         dynamic: Some(true),
         dynamic_kind: Some("value-ref".to_string()),
+        key_expr,
         ..Default::default()
     });
 }
@@ -2955,6 +2963,9 @@ fn handle_object_literal_pair_value_ref(node: &Node, source: &[u8], calls: &mut
 /// `shorthand_property_identifier_pattern` kind), so this can't misfire on
 /// destructuring targets.
 ///
+/// `key_expr` equals `name` here — the property key and the referenced value
+/// are the same identifier in shorthand form (#1895).
+///
 /// Mirrors the walk path's `shorthand_property_identifier` handling in
 /// `src/extractors/javascript.ts`'s `runCollectorWalk` (issue #1771).
 fn handle_object_literal_shorthand_value_ref(node: &Node, source: &[u8], calls: &mut Vec<Call>) {
@@ -2967,6 +2978,7 @@ fn handle_object_literal_shorthand_value_ref(node: &Node, source: &[u8], calls:
         line: start_line(node),
         dynamic: Some(true),
         dynamic_kind: Some("value-ref".to_string()),
+        key_expr: Some(text.to_string()),
         ..Default::default()
     });
 }
@@ -5202,6 +5214,75 @@ mod tests {
         assert!(value_refs.iter().any(|c| c.name == "someFunction"));
     }
 
+    // #1895: key_expr capture — the property key, distinct from the
+    // referenced value's own name, is what a dispatch consumer would
+    // actually call (`table.resolve(...)`).
+    #[test]
+    fn value_ref_captures_property_key_distinct_from_referenced_name() {
+        let s = parse_js("const table = { resolve: someFunction };");
+        let call = s
+            .calls
+            .iter()
+            .find(|c| c.dynamic_kind.as_deref() == Some("value-ref") && c.name == "someFunction")
+            .expect("expected a value-ref call");
+        assert_eq!(call.key_expr.as_deref(), Some("resolve"));
+    }
+
+    #[test]
+    fn value_ref_captures_string_literal_key_with_quotes_stripped() {
+        let s = parse_js("const table = { 'resolve': someFunction };");
+        let call = s
+            .calls
+            .iter()
+            .find(|c| c.dynamic_kind.as_deref() == Some("value-ref") && c.name == "someFunction")
+            .expect("expected a value-ref call");
+        assert_eq!(call.key_expr.as_deref(), Some("resolve"));
+    }
+
+    #[test]
+    fn value_ref_captures_computed_string_literal_key() {
+        let s = parse_js("const table = { ['resolve']: someFunction };");
+        let call = s
+            .calls
+            .iter()
+            .find(|c| c.dynamic_kind.as_deref() == Some("value-ref") && c.name == "someFunction")
+            .expect("expected a value-ref call");
+        assert_eq!(call.key_expr.as_deref(), Some("resolve"));
+    }
+
+    #[test]
+    fn value_ref_leaves_key_expr_unset_for_non_string_computed_key() {
+        let s = parse_js("const table = { [Symbol.iterator]: someFunction };");
+        let call = s
+            .calls
+            .iter()
+            .find(|c| c.dynamic_kind.as_deref() == Some("value-ref") && c.name == "someFunction")
+            .expect("expected a value-ref call");
+        assert_eq!(call.key_expr, None);
+    }
+
+    #[test]
+    fn value_ref_key_expr_equals_name_for_shorthand_property() {
+        let s = parse_js("const table = { someFunction };");
+        let call = s
+            .calls
+            .iter()
+            .find(|c| c.dynamic_kind.as_deref() == Some("value-ref") && c.name == "someFunction")
+            .expect("expected a value-ref call");
+        assert_eq!(call.key_expr.as_deref(), Some("someFunction"));
+    }
+
+    #[test]
+    fn instanceof_value_ref_leaves_key_expr_unset() {
+        let s = parse_js("if (err instanceof CodegraphError) {}");
+        let call = s
+            .calls
+            .iter()
+            .find(|c| c.dynamic_kind.as_deref() == Some("value-ref") && c.name == "CodegraphError")
+            .expect("expected a value-ref call");
+        assert_eq!(call.key_expr, None);
+    }
+
     #[test]
     fn no_value_ref_call_for_call_expression_value() {
         let s = parse_js("const table = { resolve: someFunction() };");

src/domain/graph/builder/call-resolver.ts

@@ -45,6 +45,43 @@ export const RECEIVER_KINDS = new Set(['class', 'struct', 'interface', 'type', '
 // continue to work without changes (build-edges.ts, etc.).
 export { isModuleScopedLanguage };
 
+/**
+ * Collect the set of property/method names ever invoked via member-call
+ * syntax (`x.name(...)`) across every file currently being processed —
+ * regardless of whether the receiver `x` itself resolves to anything.
+ *
+ * Used as the "one hop further" liveness check for object-literal-property
+ * value-refs (#1895): a function referenced as `{ resolve: someFn }` should
+ * only be credited with a `calls` edge from that reference when something,
+ * somewhere, actually invokes a `.resolve(...)`-shaped call — otherwise the
+ * property is wired up but never read, and `someFn` is genuinely dead.
+ *
+ * Scope matches whatever set of files the caller passes in: the full
+ * codebase for a full build (build-edges.ts's `buildCallEdgesJS`, from
+ * `ctx.fileSymbols`), or just the single file being rebuilt on an incremental
+ * update (incremental.ts's `buildCallEdges`, from that file's own `calls`).
+ * The incremental case is a narrower, same-file view — a cross-file consumer
+ * added in a different, untouched file won't be seen until the next full
+ * rebuild — the same scoping trade-off already accepted elsewhere in this
+ * codebase's incremental classification (`hasActiveFileSiblings` and
+ * exported-via-reexport both recompute from an affected subset, not the
+ * whole graph, in `graph/classifiers/roles.rs`'s incremental path — median
+ * fan-in/out is a separate case, deliberately kept as a whole-graph
+ * statistic even on the incremental path, for classification-threshold
+ * consistency).
+ */
+export function collectInvokedPropertyNames(
+  callsList: Iterable<Iterable<{ name: string; receiver?: string }>>,
+): Set<string> {
+  const names = new Set<string>();
+  for (const calls of callsList) {
+    for (const call of calls) {
+      if (call.receiver) names.add(call.name);
+    }
+  }
+  return names;
+}
+
 /**
  * Shared by both the full-build (build-edges.ts) and incremental (incremental.ts)
  * same-class fallback strategies: derive the enclosing class name from the

src/domain/graph/builder/incremental.ts

@@ -31,6 +31,7 @@ import {
 } from '../resolver/points-to.js';
 import {
   type CallNodeLookup,
+  collectInvokedPropertyNames,
   findCaller,
   isModuleScopedLanguage,
   resolveCallTargets,
@@ -1044,6 +1045,10 @@ function buildCallEdges(
   // JS path uses (buildPointsToMapForFile, shared via resolver/points-to.js).
   const ptsMap = buildPointsToMapForFile(symbols, importedNames);
   const fnRefBindingLhs = new Set(symbols.fnRefBindings?.map((b) => b.lhs) ?? []);
+  // #1895: scoped to this file's own calls only — see collectInvokedPropertyNames
+  // doc comment (call-resolver.ts) for why incremental rebuilds use a narrower,
+  // same-file view rather than a full-codebase one.
+  const invokedPropertyNames = collectInvokedPropertyNames([symbols.calls]);
   let edgesAdded = 0;
 
   for (const call of symbols.calls) {
@@ -1078,6 +1083,12 @@ function buildCallEdges(
       targets = targets.filter(
         (t) => t.kind === 'function' || t.kind === 'method' || t.kind === 'class',
       );
+      // #1895: object-literal-property value-refs additionally require
+      // independent evidence the property is actually invoked somewhere —
+      // mirrors the same check in resolveFallbackTargets (stages/build-edges.ts).
+      if (call.keyExpr && !invokedPropertyNames.has(call.keyExpr)) {
+        targets = [];
+      }
     }
 
     edgesAdded += emitIncrementalCallEdges(