es-toolkit/dist/compat/_internal/isKey.js

A state-of-the-art, high-performance JavaScript utility library with a small bundle size and strong type annotations.

const require_isSymbol = require("../predicate/isSymbol.js");
//#region src/compat/_internal/isKey.ts
/**  Matches any deep property path. (e.g. `a.b[0].c`)*/
const regexIsDeepProp = /\.|\[(?:[^[\]]*|(["'])(?:(?!\1)[^\\]|\\.)*?\1)\]/;
/**  Matches any word character (alphanumeric & underscore).*/
const regexIsPlainProp = /^\w*$/;
/**
* Checks if `value` is a property name and not a property path. (It's ok that the `value` is not in the keys of the `object`)
* @param {unknown} value The value to check.
* @param {unknown} object The object to query.
* @returns {boolean} Returns `true` if `value` is a property name, else `false`.
*
* @example
* isKey('a', { a: 1 });
* // => true
*
* isKey('a.b', { a: { b: 2 } });
* // => false
*/
function isKey(value, object) {
	if (Array.isArray(value)) return false;
	if (typeof value === "number" || typeof value === "boolean" || value == null || require_isSymbol.isSymbol(value)) return true;
	return typeof value === "string" && (regexIsPlainProp.test(value) || !regexIsDeepProp.test(value)) || object != null && Object.hasOwn(object, value);
}
//#endregion
exports.isKey = isKey;