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MIT License http://www.opensource.org/licenses/mit-license.php

Author Tobias Koppers @sokra

"use strict";

const Watchpack = require("watchpack");

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);

this.watcher.once("aggregated", (changes, removals) => {

changes = changes.concat(removals);

if(this.inputFileSystem && this.inputFileSystem.purge) {

this.inputFileSystem.purge(changes);

}

const times = this.watcher.getTimes();

callback(null,

changes.filter(file => files.indexOf(file) >= 0).sort(),

changes.filter(file => dirs.indexOf(file) >= 0).sort(),

changes.filter(file => missing.indexOf(file) >= 0).sort(), times, times);

});

this.watcher.watch(files.concat(missing), dirs.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();

}

};

}

module.exports = NodeWatchFileSystem;

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