Lodash Internal baseIndexOf Function (Legacy)

Common errors

• TypeError: baseIndexOf is not a function

  cause Attempting to use `baseIndexOf` after an incorrect or failed import, or if the module itself wasn't resolved correctly.
  fix Verify the `require('lodash._baseindexof')` statement is correct and that the package is installed. Ensure you're in a CommonJS environment or that your bundler correctly handles CJS imports for this legacy package.

• Error: Cannot find module 'lodash._baseindexof'

  cause The package is not installed, or your environment is trying to resolve it as an ESM module without CJS fallback.
  fix Run `npm install lodash._baseindexof` or ensure your bundler (like Webpack) is configured with aliases or fallbacks if you're trying to use a different Lodash import path. Consider migrating to modern Lodash imports.

Warnings

• deprecated This package (`lodash._baseindexof` v3.1.0) is a legacy internal module from Lodash v3.x and is no longer actively maintained. Using it in modern applications is discouraged.
  Fix: Migrate to using named imports from the main `lodash` package (e.g., `import { indexOf } from 'lodash';`) or `lodash-es` for tree-shakeable builds.
• breaking Lodash v4 introduced significant breaking changes compared to v3, including changes in modularization strategy. This package is not compatible with the standard Lodash v4 modular imports.
  Fix: Refactor code to use modern Lodash v4+ import patterns, such as `import { indexOf } from 'lodash';` or `import indexOf from 'lodash/indexOf';` for equivalent functionality.
• gotcha This package is a CommonJS module (`require`). Direct `import` statements (ESM) will not work without proper bundler configuration for CJS interoperability.
  Fix: Ensure your build system (e.g., Webpack, Rollup) is configured to handle CommonJS modules if you must use this legacy package. Otherwise, migrate to an ESM-compatible Lodash import.

Install

• npm install lodash._baseindexof npm
• yarn add lodash._baseindexof yarn
• pnpm add lodash._baseindexof pnpm

Imports

• baseIndexOf

  const baseIndexOf = require('lodash._baseindexof');

  This package is a CommonJS module from the Lodash v3 era. For modern Lodash (v4+), prefer named imports from 'lodash' or 'lodash-es' for functions like 'indexOf'.
• indexOf
  wrong:

  import baseIndexOf from 'lodash._baseindexof';

  correct:

  import { indexOf } from 'lodash';

  The modern, tree-shakeable way to get equivalent functionality in Lodash v4+. The function name is typically `indexOf`, not `baseIndexOf` for public API.
• indexOf
  wrong:

  require('lodash/indexOf')

  correct:

  import indexOf from 'lodash/indexOf';

  A common way to import individual functions from Lodash v4+ in Node.js environments that support ESM syntax or with bundlers. This pattern is not applicable to `lodash._baseindexof`.

Quickstart

Demonstrates how to import and use the `baseIndexOf` function from this legacy CommonJS module, highlighting its strict equality comparison.

const baseIndexOf = require('lodash._baseindexof');

// Example usage of baseIndexOf, which is similar to Array.prototype.indexOf
const numbers = [10, 20, 30, 40, 20];

console.log('Finding 30:', baseIndexOf(numbers, 30, 0)); // Expected: 2
console.log('Finding 20 from index 2:', baseIndexOf(numbers, 20, 2)); // Expected: 4
console.log('Finding 50 (not found):', baseIndexOf(numbers, 50, 0)); // Expected: -1

const objects = [{ id: 1 }, { id: 2 }, { id: 1 }];
// Note: baseIndexOf performs strict equality (===), so it won't work for objects directly.
console.log('Finding {id:1} (object equality):', baseIndexOf(objects, { id: 1 }, 0)); // Expected: -1

console.log('This module is part of Lodash v3 and uses CommonJS `require`.');
console.log('For modern applications, consider `import { indexOf } from "lodash"` or `lodash-es`.');