config-manager.js
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config-manager.js
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	const dotProp = require("dot-prop");
	const merge = require("merge");

	module.exports = class ConfigManager {
	constructor() {
	this.DEFAULT_CONFIG = {};
	this.CUSTOM_CONFIG = {};
	this.isLocked = false;
	}
	setDefault(key, value) {
	this._setGivenConfig(this.DEFAULT_CONFIG, key, value);
	}
	getDefaultConfig(key) {
	return dotProp.get(this.DEFAULT_CONFIG, key);
	}
	set(key, value) {
	this._setGivenConfig(this.CUSTOM_CONFIG, key, value);
	}
	_setGivenConfig(config, key, value) {
	this._warnIfLocked();
	dotProp.set(config, key, value);
	}
	_warnIfLocked() {
	if (this.isLocked) {
	console.warn(
	"Warning: " +
	"you shouldn't change config after ConfigManager was locked"
	);
	}
	}
	setRoot(params) {
	this._warnIfLocked();
	merge.recursive(this.CUSTOM_CONFIG, params);
	}
	get(key) {
	return dotProp.get(
	merge.recursive(true, this.DEFAULT_CONFIG, this.CUSTOM_CONFIG),
	key
	);
	}
	lock() {
	this.isLocked = true;
	}
	};