perf: correctly split timestamp by file/dependency and only call getT…

…imeInfoEntries once

lib/node/NodeWatchFileSystem.js

@@ -68,6 +68,8 @@ class NodeWatchFileSystem {
 		if (callbackUndelayed) {
 			this.watcher.once("change", callbackUndelayed);
 		}
+
+		let fileMap, directoryMap;
 		this.watcher.once("aggregated", (changes, removals) => {
 			if (this.inputFileSystem && this.inputFileSystem.purge) {
 				const fs = this.inputFileSystem;
@@ -78,8 +80,10 @@ class NodeWatchFileSystem {
 					fs.purge(item);
 				}
 			}
-			const times = this.watcher.getTimeInfoEntries();
-			callback(null, times, times, changes, removals);
+			fileMap = new Map();
+			directoryMap = new Map();
+			this.watcher.getTimeInfoEntries(fileMap, directoryMap);
+			callback(null, fileMap, directoryMap, changes, removals);
 		});
 
 		this.watcher.watch({ files, directories, missing, startTime });
@@ -120,18 +124,18 @@ class NodeWatchFileSystem {
 				return items;
 			},
 			getFileTimeInfoEntries: () => {
+				if (fileMap) return fileMap;
 				if (this.watcher) {
 					return this.watcher.getTimeInfoEntries();
-				} else {
-					return new Map();
 				}
+				return new Map();
 			},
 			getContextTimeInfoEntries: () => {
+				if (directoryMap) return directoryMap;
 				if (this.watcher) {
 					return this.watcher.getTimeInfoEntries();
-				} else {
-					return new Map();
 				}
+				return new Map();
 			}
 		};
 	}