fix(javascript): select JSON and addon loaders by exact suffix (#7821)

Node's CommonJS loader matches registered extensions case-sensitively, so
require("./data.JSON") and require("./addon.NODE") run as JavaScript.
Derive target_json_status and the native loads relation from the exact
loader suffix instead of the inventory's case-folded file kind.

Fixes #7623

src/application/javascript/JavaScriptArtifactGraphFindings.ts

@@ -36,6 +36,7 @@ import {
 import {
   moduleResolutionModeForJavaScriptReference,
   isJsonModuleTarget,
+  isNativeAddonModuleTarget,
 } from "../../domain/javascript/javascriptModuleResolutionMode.js";
 
 type StaticReference = JavaScriptStaticAnalysis["references"][number];
@@ -309,7 +310,8 @@ const addReference = (
     coverage: input.coverage,
     relation:
       input.value.operation === "load" &&
-      resolved?.file?.kind === "native-addon"
+      resolved?.path != null &&
+      isNativeAddonModuleTarget(resolved.path, resolved.file?.kind)
         ? "loads"
         : "imports",
     properties: {

src/application/javascript/JavaScriptModuleRelationships.ts

@@ -18,7 +18,10 @@ import type {
   JavaScriptModuleOrigin,
   JavaScriptSemanticModuleLink,
 } from "../../domain/javascript/javascriptSemanticIr.js";
-import { moduleResolutionModeForJavaScriptReference } from "../../domain/javascript/javascriptModuleResolutionMode.js";
+import {
+  isJsonModuleTarget,
+  moduleResolutionModeForJavaScriptReference,
+} from "../../domain/javascript/javascriptModuleResolutionMode.js";
 import type { JavaScriptArtifactFile } from "../../domain/javascript/javascriptArtifactFiles.js";
 import {
   addAstContainsEdge,
@@ -327,10 +330,9 @@ const resolveModuleTarget = (
     node,
     path,
     file,
-    jsonStatus:
-      file.kind === "json" || file.kind === "package-json"
-        ? input.context.analysis.jsonDocuments.read(file).status
-        : null,
+    jsonStatus: isJsonModuleTarget(path, file.kind)
+      ? input.context.analysis.jsonDocuments.read(file).status
+      : null,
     status: "resolved",
     limitations: resolution.limitations,
     resolution,

src/domain/javascript/javascriptModuleResolutionMode.ts

@@ -8,6 +8,12 @@ export const isJsonModuleTarget = (
 ): boolean =>
   path.endsWith(".json") && (kind === "json" || kind === "package-json");
 
+/** Native-addon dispatch likewise needs the exact `.node` loader suffix. */
+export const isNativeAddonModuleTarget = (
+  path: string,
+  kind: JavaScriptArtifactFileKind | undefined,
+): boolean => path.endsWith(".node") && kind === "native-addon";
+
 /** Loader evidence retained for a source-level module reference. */
 export type JavaScriptModuleResolutionMode =
   | "import"

tests/boundary/filesystem/javascriptRequireLiteralPaths.test.ts

@@ -27,6 +27,32 @@ const analyze = async (root: string) => {
   };
 };
 
+const analyzeLoaderSuffixCase = async () => {
+  const root = await createTestTempDirectory("rea-require-suffix-case-");
+  const javascript = 'module.exports = { loadedBy: "javascript" };';
+  // Case-insensitive hosts cannot hold both spellings in one directory.
+  await mkdir(join(root, "lower"));
+  await Promise.all([
+    writeFile(
+      join(root, "main.cjs"),
+      ["./data.JSON", "./addon.NODE", "./lower/data.json", "./lower/addon.node"]
+        .map((specifier) => `require(${JSON.stringify(specifier)});`)
+        .join("\n"),
+    ),
+    writeFile(join(root, "data.JSON"), javascript),
+    writeFile(join(root, "addon.NODE"), javascript),
+    writeFile(join(root, "lower", "data.json"), '{"loadedBy":"json"}'),
+    writeFile(join(root, "lower", "addon.node"), Buffer.from([0, 1, 2, 3])),
+  ]);
+  // Node matches registered loader extensions case-sensitively.
+  const nodeRequire = createRequire(join(root, "main.cjs"));
+  expect(nodeRequire("./data.JSON")).toEqual({ loadedBy: "javascript" });
+  expect(nodeRequire("./addon.NODE")).toEqual({ loadedBy: "javascript" });
+  const { graph } = await analyze(root);
+  return (specifier: string) =>
+    graph.edges.filter((edge) => edge.properties.specifier === specifier);
+};
+
 describe("literal CommonJS paths in application graphs", () => {
   it("agrees with Node for both require projections while preserving ESM suffixes", async () => {
     const root = await createTestTempDirectory("rea-literal-require-");
@@ -77,6 +103,34 @@ describe("literal CommonJS paths in application graphs", () => {
     expect(graph.coverage.status).toBe("complete");
   });
 
+  it("attaches JSON loader status only to Node's exact .json suffix", async () => {
+    const edges = await analyzeLoaderSuffixCase();
+    const relationship = (specifier: string) =>
+      edges(specifier).find(
+        (edge) => edge.properties.module_link_kind === "require",
+      )?.properties;
+    expect(relationship("./data.JSON")).toMatchObject({
+      resolved_path: "data.JSON",
+      target_file_kind: "json",
+      target_json_status: null,
+    });
+    expect(relationship("./lower/data.json")).toMatchObject({
+      resolved_path: "lower/data.json",
+      target_file_kind: "json",
+      target_json_status: "included",
+    });
+  });
+
+  it("emits a native loads edge only for Node's exact .node suffix", async () => {
+    const edges = await analyzeLoaderSuffixCase();
+    const relations = (specifier: string) =>
+      edges(specifier)
+        .filter((edge) => edge.properties.kind === "require")
+        .map((edge) => edge.relation);
+    expect(relations("./addon.NODE")).toEqual(["imports"]);
+    expect(relations("./lower/addon.node")).toEqual(["loads"]);
+  });
+
   it.each(["literal", "stripped", "both"] as const)(
     "keeps native graph/count projections aligned with %s files",
     async (layout) => {