[FIX] projectGraphBuilder: Add module cache invalidation

lib/graph/projectGraphBuilder.js

@@ -161,6 +161,24 @@ async function projectGraphBuilder(nodeProvider, workspace) {
 		const {nodes, parentProject} = queue.shift(); // Get and remove first entry from queue
 		const res = await Promise.all(nodes.map(async (node) => {
 			let ui5Module = moduleCollection[node.id];
+
+			if (ui5Module) {
+				log.silly(
+					`Re-visiting module ${node.id} as a dependency of ${parentProject.getName()}`);
+
+				const {project, extensions} = await ui5Module.getSpecifications();
+				if (!project && !extensions.length) {
+					// Invalidate cache if the cached module is visited through another parent project and did not
+					// resolve to anything useful (project or extension(s)) before.
+					// The module being visited now might be a different version where it contains UI5 Tooling
+					// configuration, or one of the parent projects could have defined a shim extension meanwhile
+					log.silly(
+						`Cached module ${node.id} did not resolve to any projects or extensions. ` +
+						`Recreating module as a dependency of ${parentProject.getName()}...`);
+					ui5Module = null;
+				}
+			}
+
 			if (!ui5Module) {
 				log.silly(`Visiting Module ${node.id} as a dependency of ${parentProject.getName()}`);
 				log.verbose(`Creating module ${node.id}...`);
@@ -174,8 +192,6 @@ async function projectGraphBuilder(nodeProvider, workspace) {
 					shimCollection
 				});
 			} else {
-				log.silly(
-					`Re-visiting module ${node.id} as a dependency of ${parentProject.getName()}`);
 				if (ui5Module.getPath() !== node.path) {
 					log.verbose(
 						`Warning - Dependency ${node.id} is available at multiple paths:` +

test/lib/graph/projectGraphBuilder.js

@@ -674,6 +674,62 @@ test("Dependencies defined through shim", async (t) => {
 	t.deepEqual(graph.getDependencies("project-3"), ["project-2"], "Shimmed dependency has been defined");
 });
 
+test("Define external dependency as shims in sub-module", async (t) => {
+	t.context.getRootNode.resolves(createNode({
+		id: "app",
+		version: "1.0.0",
+		path: "/app"
+	}));
+
+	t.context.getDependencies.onCall(0).resolves([
+		createNode({
+			id: "lib",
+			version: "1.0.0",
+			path: "/lib"
+		}),
+		{
+			id: "external-thirdparty",
+			version: "1.0.0",
+			path: "/app/node_modules/external-thirdparty"
+		},
+		createNode({
+			id: "external-thirdparty-shim",
+			configuration: {
+				kind: "extension",
+				type: "project-shim",
+				shims: {
+					configurations: {
+						"external-thirdparty": {
+							specVersion: "3.0",
+							type: "module",
+							metadata: {name: "external-thirdparty"},
+							resources: {
+								configuration: {
+									paths: {"/resources/": ""},
+								},
+							},
+						},
+					},
+				},
+			}
+		})
+	]);
+
+	t.context.getDependencies.onCall(1).resolves([
+		createNode({
+			id: "external-thirdparty",
+			version: "1.0.0",
+			path: "/app/node_modules/external-thirdparty",
+			optional: false
+		})
+	]);
+
+	const graph = await projectGraphBuilder(t.context.provider);
+
+	t.deepEqual(graph.getDependencies("app"), ["lib"], "'app' depends on 'lib'");
+	t.deepEqual(graph.getDependencies("lib"), ["external-thirdparty"], "'lib' depends on 'external-thirdparty'");
+});
+
 test("Extension in dependencies", async (t) => {
 	t.context.getRootNode.resolves(createNode({
 		id: "id1",