chore: import upstream snapshot with attribution

tests/fixtures/sample_map_dispatch.ts

@@ -0,0 +1,55 @@
+// Fixture for testing REFERENCES edge extraction in map dispatch patterns.
+
+function handleCreate(data: any): void {
+    console.log("create", data);
+}
+
+function handleUpdate(data: any): void {
+    console.log("update", data);
+}
+
+function handleDelete(data: any): void {
+    console.log("delete", data);
+}
+
+function validateInput(data: any): boolean {
+    return data != null;
+}
+
+function processData(data: any): any {
+    return data;
+}
+
+function formatOutput(data: any): string {
+    return JSON.stringify(data);
+}
+
+// Pattern 1: Object literal with function values (Record<string, Handler>)
+const handlers: Record<string, (data: any) => void> = {
+    create: handleCreate,
+    update: handleUpdate,
+    delete: handleDelete,
+};
+
+// Pattern 2: Shorthand property references
+const shorthandMap = { validateInput, processData };
+
+// Pattern 3: Property assignment to map
+const dynamicHandlers: Record<string, Function> = {};
+dynamicHandlers['format'] = formatOutput;
+
+// Pattern 4: Array of function references (pipeline)
+const pipeline = [validateInput, processData, formatOutput];
+
+// Pattern 5: Function passed as callback argument
+function register(fn: Function): void {
+    // registration logic
+}
+
+function dispatch(action: string): void {
+    const handler = handlers[action];
+    if (handler) {
+        register(handleCreate);
+        handler({});
+    }
+}