watch package.json for managed directories

lib/FileSystemInfo.js

@@ -1993,6 +1993,7 @@ class FileSystemInfo {
 					if (managedItem) {
 						managedItems.add(managedItem);
 						managedSet.add(path);
+						managedFiles.add(join(this.fs, managedItem, "package.json"));
 						return true;
 					}
 				}
@@ -2003,6 +2004,7 @@ class FileSystemInfo {
 					if (managedItem) {
 						managedItems.add(managedItem);
 						managedSet.add(path);
+						managedFiles.add(join(this.fs, managedItem, "package.json"));
 						return true;
 					}
 				}

test/configCases/cache-dependencies/managed-items/webpack.config.js

@@ -23,8 +23,5 @@ module.exports = {
 				expect(fileDeps).toContain(path.resolve(__dirname, "index.js"));
 			});
 		}
-	],
-	module: {
-		unsafeCache: false
-	}
+	]
 };

test/watchCases/cache/unsafe-cache-managed-paths/0/index.js

@@ -0,0 +1,5 @@
+import value from "package";
+
+it("should detect updates of managed paths when version changes", () => {
+	expect(value).toBe(WATCH_STEP);
+});

test/watchCases/cache/unsafe-cache-managed-paths/0/node_modules/package/index.js

@@ -0,0 +1 @@
+export default "0";

test/watchCases/cache/unsafe-cache-managed-paths/0/node_modules/package/package.json

@@ -0,0 +1,4 @@
+{
+  "name": "package",
+  "version": "0.0.0"
+}

test/watchCases/cache/unsafe-cache-managed-paths/1/node_modules/package/index.js

@@ -0,0 +1 @@
+export default "1";

test/watchCases/cache/unsafe-cache-managed-paths/1/node_modules/package/package.json

@@ -0,0 +1,4 @@
+{
+  "name": "package",
+  "version": "0.0.1"
+}

test/watchCases/cache/unsafe-cache-managed-paths/2/node_modules/package/index.js

@@ -0,0 +1 @@
+export default "2";

test/watchCases/cache/unsafe-cache-managed-paths/2/node_modules/package/package.json

@@ -0,0 +1,4 @@
+{
+  "name": "package",
+  "version": "0.0.2"
+}

test/watchCases/cache/unsafe-cache-managed-paths/webpack.config.js

@@ -0,0 +1,10 @@
+/** @type {function(): import("../../../../").Configuration} */
+module.exports = (env, { srcPath }) => ({
+	mode: "development",
+	cache: {
+		type: "memory"
+	},
+	snapshot: {
+		managedPaths: [/^(.+?[\\/]node_modules[\\/])/]
+	}
+});