dist/node/helpers/link.js
function byLink(obj, link, opt_params) {
	const p = opt_params || {};

	const linkList = (0, _types.isString)(link) ? (0, _gcc.any)(link).split('.') : [].concat(link),
	      length = linkList.length,
	      last = length - 1;

	let pre, preKey;

	for (let i = -1; ++i < length;) {
		const el = linkList[i];

		if (obj == null) {
			if (p.test) {
				return false;
			}

			if (p.error) {
				throw new ReferenceError(`${el} is not defined!`);
			}

			if (p.delete) {
				return {
					notFound: true,
					result: false,
					key: undefined,
					value: undefined
				};
			}

			return undefined;
		}

		const isTest = i === last && p.test;

		if (isTest) {
			pre = obj;
			preKey = el;
		}

		const objIsMap = (0, _types.isMap)(obj),
		      objIsSet = (0, _types.isSet)(obj);

		const isAMap = objIsMap || (0, _types.isWeakMap)(obj),
		      isASet = objIsSet || (0, _types.isWeakSet)(obj);

		// Set or delete
		if (!isTest && i === last && (p.delete || 'value' in p)) {
			const cache = {
				key: isASet ? null : el,
				result: isAMap || isASet ? obj.has(el) : el in obj,
				value: isAMap ? obj.get(el) : isASet ? el : obj[el]
			};

			if ('value' in p) {
				cache.newValue = p.value;
			}

			if (p.delete) {
				if (cache.result) {
					if (isAMap || isASet) {
						obj.delete(el);
						cache.result = !obj.has(el);
					} else {
						if ((0, _types.isLikeArray)(obj) && !isNaN(Number(el))) {
							if ((0, _types.isArray)(obj)) {
								obj.splice(el, 1);
							} else {
								splice.call(obj, el, 1);
							}
						} else {
							delete obj[el];
						}

						cache.result = el in obj === false || obj[el] !== cache.value;
					}
				}
			} else {
				if (isAMap) {
					if (obj.get(el) !== p.value) {
						obj.set(el, p.value);
						cache.result = obj.get(el) === p.value;
					} else {
						cache.result = false;
					}
				} else if (isASet) {
					const has = obj.has(el);

					cache.result = false;
					cache.value = has ? el : undefined;

					if (!obj.has(p.value)) {
						if (has) {
							obj.delete(el);
						}

						obj.add(p.value);
						cache.result = obj.has(p.value);
					}
				} else {
					if ((0, _types.isLikeArray)(obj) && !isNaN(Number(cache.key))) {
						cache.key = Number(cache.key);
					} else {
						cache.key = String(cache.key);
					}

					if (obj[el] !== p.value) {
						obj[el] = p.value;
						cache.result = obj[el] === p.value;
					} else {
						cache.result = false;
					}
				}
			}

			return cache;
		}

		if (isAMap) {
			obj = obj.get(el);
		} else if (isASet) {
			if (obj.has(el)) {
				obj = el;
			} else {
				obj = undefined;
			}
		} else {
			if (p.create && obj[el] === undefined) {
				obj[el] = {};
			}

			obj = obj[el];
		}
	}

	if (p.test) {
		if ((0, _types.isMap)(pre) || (0, _types.isWeakMap)(pre) || (0, _types.isSet)(pre) || (0, _types.isWeakSet)(pre)) {
			return pre.has(preKey);
		}

		return preKey in pre;
	}

	return obj;
}
function byLink(obj, link, opt_params) {
	const p = opt_params || {};

	const linkList = (0, _types.isString)(link) ? (0, _gcc.any)(link).split('.') : [].concat(link),
	      length = linkList.length,
	      last = length - 1;

	let pre, preKey;

	for (let i = -1; ++i < length;) {
		const el = linkList[i];

		if (obj == null) {
			if (p.test) {
				return false;
			}

			if (p.error) {
				throw new ReferenceError(`${el} is not defined!`);
			}

			if (p.delete) {
				return {
					notFound: true,
					result: false,
					key: undefined,
					value: undefined
				};
			}

			return undefined;
		}

		const isTest = i === last && p.test;

		if (isTest) {
			pre = obj;
			preKey = el;
		}

		const objIsMap = (0, _types.isMap)(obj),
		      objIsSet = (0, _types.isSet)(obj);

		const isAMap = objIsMap || (0, _types.isWeakMap)(obj),
		      isASet = objIsSet || (0, _types.isWeakSet)(obj);

		// Set or delete
		if (!isTest && i === last && (p.delete || 'value' in p)) {
			const cache = {
				key: isASet ? null : el,
				result: isAMap || isASet ? obj.has(el) : el in obj,
				value: isAMap ? obj.get(el) : isASet ? el : obj[el]
			};

			if ('value' in p) {
				cache.newValue = p.value;
			}

			if (p.delete) {
				if (cache.result) {
					if (isAMap || isASet) {
						obj.delete(el);
						cache.result = !obj.has(el);
					} else {
						if ((0, _types.isLikeArray)(obj) && !isNaN(Number(el))) {
							if ((0, _types.isArray)(obj)) {
								obj.splice(el, 1);
							} else {
								splice.call(obj, el, 1);
							}
						} else {
							delete obj[el];
						}

						cache.result = el in obj === false || obj[el] !== cache.value;
					}
				}
			} else {
				if (isAMap) {
					if (obj.get(el) !== p.value) {
						obj.set(el, p.value);
						cache.result = obj.get(el) === p.value;
					} else {
						cache.result = false;
					}
				} else if (isASet) {
					const has = obj.has(el);

					cache.result = false;
					cache.value = has ? el : undefined;

					if (!obj.has(p.value)) {
						if (has) {
							obj.delete(el);
						}

						obj.add(p.value);
						cache.result = obj.has(p.value);
					}
				} else {
					if ((0, _types.isLikeArray)(obj) && !isNaN(Number(cache.key))) {
						cache.key = Number(cache.key);
					} else {
						cache.key = String(cache.key);
					}

					if (obj[el] !== p.value) {
						obj[el] = p.value;
						cache.result = obj[el] === p.value;
					} else {
						cache.result = false;
					}
				}
			}

			return cache;
		}

		if (isAMap) {
			obj = obj.get(el);
		} else if (isASet) {
			if (obj.has(el)) {
				obj = el;
			} else {
				obj = undefined;
			}
		} else {
			if (p.create && obj[el] === undefined) {
				obj[el] = {};
			}

			obj = obj[el];
		}
	}

	if (p.test) {
		if ((0, _types.isMap)(pre) || (0, _types.isWeakMap)(pre) || (0, _types.isSet)(pre) || (0, _types.isWeakSet)(pre)) {
			return pre.has(preKey);
		}

		return preKey in pre;
	}

	return obj;
}
Sets a value to an object property by a link or returns/deletes the property.
At changing or deleting the property returns an object:

{
result: boolean,
key,
value
}

@param {?} obj
@param {$$CollectionLink} link - source link:
STRING-LINK:
a.foo.bar ~ obj['foo']['bar']

ARRAY-LINK:
[{}, 1, null] ~ obj[{}][1][null]

@param {$$Collection_byLink=} [opt_params] - additional parameters:

[value] - value to set
[delete = delete] - if true, then the property will be deleted
[create = false] - if true, then the property will be created if it's not defined
[test = false] - if is true, then will be returned false if the property is not defined

@return {({result: boolean, key, value, notFound: (boolean|undefined)}|?)}