async _readFile(filename) {
		let content = null;

		try {
			if (this.storage) {
				content = await this.storage.readFile(filename);
			}
		} catch (ex) {
			this.emit('debug', `Error reading file ${filename}: ${ex.message}`);
		}

		return content;
	}
@param {string} filename
@returns {Promise<Buffer|null>}
@protected