73 lines
2.1 KiB
JavaScript
73 lines
2.1 KiB
JavaScript
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/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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Author Tobias Koppers @sokra
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*/
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"use strict";
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const Watchpack = require("watchpack");
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class NodeWatchFileSystem {
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constructor(inputFileSystem) {
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this.inputFileSystem = inputFileSystem;
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this.watcherOptions = {
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aggregateTimeout: 0
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};
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this.watcher = new Watchpack(this.watcherOptions);
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}
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watch(files, dirs, missing, startTime, options, callback, callbackUndelayed) {
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if(!Array.isArray(files))
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throw new Error("Invalid arguments: 'files'");
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if(!Array.isArray(dirs))
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throw new Error("Invalid arguments: 'dirs'");
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if(!Array.isArray(missing))
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throw new Error("Invalid arguments: 'missing'");
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if(typeof callback !== "function")
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throw new Error("Invalid arguments: 'callback'");
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if(typeof startTime !== "number" && startTime)
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throw new Error("Invalid arguments: 'startTime'");
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if(typeof options !== "object")
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throw new Error("Invalid arguments: 'options'");
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if(typeof callbackUndelayed !== "function" && callbackUndelayed)
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throw new Error("Invalid arguments: 'callbackUndelayed'");
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const oldWatcher = this.watcher;
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this.watcher = new Watchpack(options);
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if(callbackUndelayed)
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this.watcher.once("change", callbackUndelayed);
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this.watcher.once("aggregated", (changes, removals) => {
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changes = changes.concat(removals);
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if(this.inputFileSystem && this.inputFileSystem.purge) {
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this.inputFileSystem.purge(changes);
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}
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const times = this.watcher.getTimes();
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callback(null,
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changes.filter(file => files.indexOf(file) >= 0).sort(),
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changes.filter(file => dirs.indexOf(file) >= 0).sort(),
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changes.filter(file => missing.indexOf(file) >= 0).sort(), times, times);
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});
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this.watcher.watch(files.concat(missing), dirs, startTime);
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if(oldWatcher) {
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oldWatcher.close();
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}
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return {
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close: () => {
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if(this.watcher) {
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this.watcher.close();
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this.watcher = null;
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}
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},
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pause: () => {
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if(this.watcher) {
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this.watcher.pause();
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}
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}
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};
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}
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}
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module.exports = NodeWatchFileSystem;
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