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1 files changed, 109 insertions, 0 deletions

diff --git a/node_modules/webpack/lib/node/NodeWatchFileSystem.js b/node_modules/webpack/lib/node/NodeWatchFileSystem.js
new file mode 100644
index 00000000..235e0f06
--- /dev/null
+++ b/node_modules/webpack/lib/node/NodeWatchFileSystem.js
@@ -0,0 +1,109 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+"use strict";
+
+const Watchpack = require("watchpack");
+const objectToMap = require("../util/objectToMap");
+
+class NodeWatchFileSystem {
+	constructor(inputFileSystem) {
+		this.inputFileSystem = inputFileSystem;
+		this.watcherOptions = {
+			aggregateTimeout: 0
+		};
+		this.watcher = new Watchpack(this.watcherOptions);
+	}
+
+	watch(files, dirs, missing, startTime, options, callback, callbackUndelayed) {
+		if (!Array.isArray(files)) {
+			throw new Error("Invalid arguments: 'files'");
+		}
+		if (!Array.isArray(dirs)) {
+			throw new Error("Invalid arguments: 'dirs'");
+		}
+		if (!Array.isArray(missing)) {
+			throw new Error("Invalid arguments: 'missing'");
+		}
+		if (typeof callback !== "function") {
+			throw new Error("Invalid arguments: 'callback'");
+		}
+		if (typeof startTime !== "number" && startTime) {
+			throw new Error("Invalid arguments: 'startTime'");
+		}
+		if (typeof options !== "object") {
+			throw new Error("Invalid arguments: 'options'");
+		}
+		if (typeof callbackUndelayed !== "function" && callbackUndelayed) {
+			throw new Error("Invalid arguments: 'callbackUndelayed'");
+		}
+		const oldWatcher = this.watcher;
+		this.watcher = new Watchpack(options);
+
+		if (callbackUndelayed) {
+			this.watcher.once("change", callbackUndelayed);
+		}
+		const cachedFiles = files;
+		const cachedDirs = dirs;
+		this.watcher.once("aggregated", (changes, removals) => {
+			changes = changes.concat(removals);
+			if (this.inputFileSystem && this.inputFileSystem.purge) {
+				this.inputFileSystem.purge(changes);
+			}
+			const times = objectToMap(this.watcher.getTimes());
+			files = new Set(files);
+			dirs = new Set(dirs);
+			missing = new Set(missing);
+			removals = new Set(removals.filter(file => files.has(file)));
+			callback(
+				null,
+				changes.filter(file => files.has(file)).sort(),
+				changes.filter(file => dirs.has(file)).sort(),
+				changes.filter(file => missing.has(file)).sort(),
+				times,
+				times,
+				removals
+			);
+		});
+
+		this.watcher.watch(
+			cachedFiles.concat(missing),
+			cachedDirs.concat(missing),
+			startTime
+		);
+
+		if (oldWatcher) {
+			oldWatcher.close();
+		}
+		return {
+			close: () => {
+				if (this.watcher) {
+					this.watcher.close();
+					this.watcher = null;
+				}
+			},
+			pause: () => {
+				if (this.watcher) {
+					this.watcher.pause();
+				}
+			},
+			getFileTimestamps: () => {
+				if (this.watcher) {
+					return objectToMap(this.watcher.getTimes());
+				} else {
+					return new Map();
+				}
+			},
+			getContextTimestamps: () => {
+				if (this.watcher) {
+					return objectToMap(this.watcher.getTimes());
+				} else {
+					return new Map();
+				}
+			}
+		};
+	}
+}
+
+module.exports = NodeWatchFileSystem;