{"id":17027,"library":"lodash._objecttypes","title":"Lodash Internal Object Types","description":"This package, `lodash._objecttypes`, is an internal utility module extracted from Lo-Dash v2.4.1, released in December 2013. It provided the `objectTypes` variable, an internal structure used by Lo-Dash's core functions for type checking (e.g., `isObject`, `isPlainObject`). It was part of Lo-Dash's modularization strategy in its second major version, where internal components and methods were published as separate npm packages. However, this specific package is not intended for direct external consumption and its internal structure, existence, and API stability were never guaranteed. The main Lodash library has since evolved significantly, with the current stable version being 4.18.1 (as of April 2026), and its internal modularization and distribution methods (like `lodash-es` for ES modules) have changed considerably. This package is no longer maintained as a standalone entity and its functionality is integrated or superseded within modern Lodash versions. Its primary historical differentiator was serving as a foundational internal piece of the Lodash v2 type-checking mechanism.","status":"abandoned","version":"2.4.1","language":"javascript","source_language":"en","source_url":"https://github.com/lodash/lodash-cli","tags":["javascript"],"install":[{"cmd":"npm install lodash._objecttypes","lang":"bash","label":"npm"},{"cmd":"yarn add lodash._objecttypes","lang":"bash","label":"yarn"},{"cmd":"pnpm add lodash._objecttypes","lang":"bash","label":"pnpm"}],"dependencies":[],"imports":[{"note":"This package is CommonJS-only from Lodash v2.x. Attempting to use ES module `import` syntax will result in errors as it does not export a default or named exports in that format.","wrong":"import objectTypes from 'lodash._objecttypes';","symbol":"objectTypes","correct":"const objectTypes = require('lodash._objecttypes');"},{"note":"The `objectTypes` export is an object, not a function. Calling it as a function will result in a TypeError.","wrong":"const objectTypes = require('lodash._objecttypes')();","symbol":"objectTypes","correct":"const objectTypes = require('lodash._objecttypes');\n// Then use objectTypes for internal checks, e.g., objectTypes[typeof value]"},{"note":"This package exports internal details. For type checking, always use the robust, public API functions provided by the main `lodash` package, which are properly maintained and handle edge cases.","wrong":"const internalTypes = require('lodash._objecttypes');\nif (internalTypes[typeof myVar]) { /* ... */ }","symbol":"type checks","correct":"// Prefer using official Lodash methods like _.isObject, _.isString, etc., from the main 'lodash' package.\nconst _ = require('lodash');\n_.isObject({});"}],"quickstart":{"code":"const objectTypes = require('lodash._objecttypes');\n\n// In Lodash v2, 'objectTypes' was used internally for quick type checks.\n// It typically mapped JavaScript's `typeof` results to booleans.\n// For example, to check if a value was an 'object' or 'function'.\n\nconsole.log('--- lodash._objecttypes example ---');\nconsole.log('Object types map:', objectTypes);\n\n// Example of how it might have been used internally (simplified):\nfunction isObjectLike(value) {\n  return objectTypes[typeof value] === true;\n}\n\nconsole.log(`isObjectLike(null): ${isObjectLike(null)}`); // null is 'object' via typeof\nconsole.log(`isObjectLike({}): ${isObjectLike({})}`);\nconsole.log(`isObjectLike([]): ${isObjectLike([])}`);\nconsole.log(`isObjectLike(() => {}): ${isObjectLike(() => {})}`);\nconsole.log(`isObjectLike(123): ${isObjectLike(123)}`);\n\n// Note: For actual Lodash usage, always use the main 'lodash' package:\n// const _ = require('lodash');\n// console.log(`_.isObjectLike({}): ${_.isObjectLike({})}`);\n","lang":"javascript","description":"Demonstrates the CommonJS import and the structure of the `objectTypes` object, illustrating its internal purpose in Lodash v2."},"warnings":[{"fix":"Do not use internal Lodash packages. Rely solely on the public API of the main `lodash` package or its officially modularized versions (e.g., `lodash-es`).","message":"This package is an internal utility from Lodash v2.x (released 2013). Its structure, content, and very existence are not stable and are subject to change or removal without notice in any modern Lodash version (v3, v4, or later). Directly depending on it will almost certainly lead to breakage.","severity":"breaking","affected_versions":">=3.0.0"},{"fix":"Migrate any direct usage to public Lodash API methods. If you are examining Lodash internals, refer to the source code of the main `lodash` repository for the relevant version.","message":"The entire pattern of exposing granular internal Lodash components as separate npm packages (like `lodash._objecttypes`) has been deprecated. Modern Lodash (v4.x) integrates such utilities internally or provides ES module versions via `lodash-es` for tree-shaking.","severity":"deprecated","affected_versions":">=2.5.0"},{"fix":"Upgrade to the latest stable version of the main `lodash` package (currently 4.18.1 or higher) and leverage its public API. Do not use unmaintained internal modules.","message":"Lodash v2.4.1, which this package is tied to, is affected by numerous known security vulnerabilities (e.g., Prototype Pollution, Code Injection, Regular Expression Denial of Service) that have been patched in later versions of the main `lodash` library. Using any code derived from such an old version, even an internal utility, introduces significant security risks.","severity":"gotcha","affected_versions":"<4.18.1"},{"fix":"If you absolutely must inspect or use this internal module (which is strongly discouraged), use `const objectTypes = require('lodash._objecttypes');`.","message":"This package is strictly CommonJS (`require()`). It does not provide ES module exports (`import`). Attempting to `import` it will result in syntax errors or runtime issues in modern JavaScript environments unless transpiled.","severity":"gotcha","affected_versions":">=2.4.1"}],"env_vars":null,"last_verified":"2026-04-22T00:00:00.000Z","next_check":"2026-07-21T00:00:00.000Z","problems":[{"fix":"Use CommonJS `require` syntax: `const objectTypes = require('lodash._objecttypes');`","cause":"Attempting to use ES module `import objectTypes from 'lodash._objecttypes';` or `import { default as objectTypes } from 'lodash._objecttypes';` when the package is CommonJS and does not have a default export.","error":"TypeError: (0, _lodash_objecttypes.default) is not a function"},{"fix":"This package is abandoned and not part of modern Lodash. Do not use it. Instead, use the public API of the main `lodash` package (e.g., `_.isObjectLike`) or `lodash-es` if you need modular ES imports.","cause":"Trying to import this package in a modern Lodash setup, where it is no longer published or included, or if the package manager cannot resolve the ancient version.","error":"Error: Cannot find module 'lodash._objecttypes'"},{"fix":"Access properties of `objectTypes` directly, e.g., `objectTypes[typeof myVar]`. Do not call it as a function.","cause":"After `const objectTypes = require('lodash._objecttypes');`, attempting to call `objectTypes()` as a function. The `objectTypes` variable is an object, not a function.","error":"TypeError: require(...) is not a function"}],"ecosystem":"npm","meta_description":null}