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Viewing / Editing File: Task.js

let chokidar = require('chokidar');
let File = require('../File');
let FileCollection = require('../FileCollection');
let NOOP = () => {};

/**
 * @template {object} TData
 */
class Task {
    /**
     * Create a new task instance.
     *
     * @param {TData} data
     */
    constructor(data) {
        /** @type {TData} */
        this.data = data;

/** @type {File[]} */
        this.assets = [];

/** @type {FileCollection} */
        this.files = new FileCollection();

this.isBeingWatched = false;
    }

/**
     * Watch all relevant files for changes.
     *
     * @param {boolean} usePolling
     */
    watch(usePolling = false) {
        if (this.isBeingWatched) return;

let files = this.files.get();
        let watcher = chokidar
            .watch(files, { usePolling, persistent: true })
            .on('change', this.onChange.bind(this));

// Workaround for issue with atomic writes.
        // See https://github.com/paulmillr/chokidar/issues/591
        if (!usePolling) {
            watcher.on('raw', event => {
                if (event === 'rename') {
                    watcher.unwatch(files);
                    watcher.add(files);
                }
            });
        }

this.isBeingWatched = true;
    }

/**
     */
    run() {
        throw new Error('Task.run is an abstract method. Please override it.');
    }

/**
     *
     * @param {string} filepath
     */
    onChange(filepath) {
        throw new Error('Task.onChange is an abstract method. Please override it.');
    }
}

module.exports = Task;

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