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NodeWatchFileSystem.js
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Mon, Feb 10, 19:30

NodeWatchFileSystem.js
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const Watchpack = require("watchpack");
/** @typedef {import("../../declarations/WebpackOptions").WatchOptions} WatchOptions */
/** @typedef {import("../FileSystemInfo").FileSystemInfoEntry} FileSystemInfoEntry */
/** @typedef {import("../util/fs").WatchFileSystem} WatchFileSystem */
/** @typedef {import("../util/fs").WatchMethod} WatchMethod */
/** @typedef {import("../util/fs").Watcher} Watcher */
class NodeWatchFileSystem {
constructor(inputFileSystem) {
this.inputFileSystem = inputFileSystem;
this.watcherOptions = {
aggregateTimeout: 0
};
this.watcher = new Watchpack(this.watcherOptions);
}
/**
* @param {Iterable<string>} files watched files
* @param {Iterable<string>} directories watched directories
* @param {Iterable<string>} missing watched exitance entries
* @param {number} startTime timestamp of start time
* @param {WatchOptions} options options object
* @param {function(Error=, Map<string, FileSystemInfoEntry>, Map<string, FileSystemInfoEntry>, Set<string>, Set<string>): void} callback aggregated callback
* @param {function(string, number): void} callbackUndelayed callback when the first change was detected
* @returns {Watcher} a watcher
*/
watch(
files,
directories,
missing,
startTime,
options,
callback,
callbackUndelayed
) {
if (!files || typeof files[Symbol.iterator] !== "function") {
throw new Error("Invalid arguments: 'files'");
}
if (!directories || typeof directories[Symbol.iterator] !== "function") {
throw new Error("Invalid arguments: 'directories'");
}
if (!missing || typeof missing[Symbol.iterator] !== "function") {
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);
}
this.watcher.once("aggregated", (changes, removals) => {
if (this.inputFileSystem && this.inputFileSystem.purge) {
for (const item of changes) {
this.inputFileSystem.purge(item);
}
for (const item of removals) {
this.inputFileSystem.purge(item);
}
}
const times = this.watcher.getTimeInfoEntries();
callback(null, times, times, changes, removals);
});
this.watcher.watch({ files, directories, missing, startTime });
if (oldWatcher) {
oldWatcher.close();
}
return {
close: () => {
if (this.watcher) {
this.watcher.close();
this.watcher = null;
}
},
pause: () => {
if (this.watcher) {
this.watcher.pause();
}
},
getFileTimeInfoEntries: () => {
if (this.watcher) {
return this.watcher.getTimeInfoEntries();
} else {
return new Map();
}
},
getContextTimeInfoEntries: () => {
if (this.watcher) {
return this.watcher.getTimeInfoEntries();
} else {
return new Map();
}
}
};
}
}
module.exports = NodeWatchFileSystem;

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