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lodash._createaggregator

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library3.0.0jsnpmunverified

This package, `lodash._createaggregator` v3.0.0, provides a modular build of Lodash's internal `createAggregator` function from the Lodash 3.x series. It is an internal utility primarily used by other Lodash functions to build collection methods like `groupBy` or `countBy`. The main Lodash library has since progressed to v4.x and beyond (currently v4.18.1 as of late 2024/early 2025). This specific package has not received any updates, bug fixes, performance improvements, or security patches since its original v3.0.0 release in 2015. It is exclusively designed for CommonJS environments. Due to its age and internal nature, it is not recommended for direct use in modern applications; developers should rely on the public API of the actively maintained `lodash` or `lodash-es` packages instead.

data
npm install lodash._createaggregator
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INSTALL
IMPORT
SIG · LODASH._CREATEAGGR
L
lodash._createaggregator
datajavascriptv3.0.0
Install
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Import
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Disk
—
Pass rate
0/ 6
Env Coverage0 / 6
glibc
18–22
musl
18–22
Install & Compatibility
Where this runs
tested against v? · npm install
Install × environment matrix
Each cell = how many times install + import succeeded across repeated harness runs. Partial = flaky.
glibc = Debian/Ubuntu slim · musl = Alpine Linux
musl
node 18–226 runs
build_error
glibc
node 18–226 runs
build_error
Code
Verified usage

Verified import paths — ran on the pinned version, not inferred.

createAggregator
✓ const createAggregator = require('lodash._createaggregator');
✗ import { createAggregator } from 'lodash._createaggregator';
This package is a CommonJS module from Lodash v3.0.0 and does not support ES module `import` syntax. Attempting to use `import` will result in runtime errors.
createAggregator (aliased)
✓ const buildAggregator = require('lodash._createaggregator');
The module exports a single function. Aliasing the `require` result is common for clarity, especially for internal utilities.
Type Definition (Incorrect)
✓ // No direct TypeScript type definitions are available or maintained for this old internal module. Consider using a custom type declaration if absolutely necessary.
✗ import type { CreateAggregator } from 'lodash._createaggregator';
This package lacks dedicated TypeScript definitions. Relying on `@types/lodash` might provide general Lodash types, but not for this specific internal utility. You may need to declare a custom module or use `@ts-ignore`.

Demonstrates how to use the internal `createAggregator` function to construct a simplified `groupBy` utility. This illustrates the factory pattern for collection aggregation, mirroring its purpose within the Lodash library's internal workings.

const createAggregator = require('lodash._createaggregator'); // Simulate the internal use of createAggregator to build a 'groupBy' like function. // createAggregator takes an 'init' function (for the initial result) and an 'accumulator' function. const myGroupBy = createAggregator( function() { return {}; }, // The 'init' function: provides the initial result object (e.g., empty object for groupBy). function(result, value, key) { // The 'accumulator' function: adds values to the result based on the key. if (!result[key]) { result[key] = []; } result[key].push(value); } // A 'reducer' function (for final processing) can also be passed as a third argument, but is optional for simple aggregation like groupBy. ); const data = [ { 'user': 'barney', 'age': 36, 'active': true }, { 'user': 'fred', 'age': 40, 'active': false }, { 'user': 'pebbles', 'age': 1, 'active': true }, { 'user': 'fred', 'age': 40, 'active': true } ]; console.log('Grouped by age:', myGroupBy(data, item => item.age)); /* Expected output: { '36': [ { user: 'barney', age: 36, active: true } ], '40': [ { user: 'fred', age: 40, active: false }, { user: 'fred', age: 40, active: true } ], '1': [ { user: 'pebbles', age: 1, active: true } ] } */ console.log('Grouped by active status:', myGroupBy(data, item => item.active)); /* Expected output: { 'true': [ { user: 'barney', age: 36, active: true }, { user: 'pebbles', age: 1, active: true }, { user: 'fred', age: 40, active: true } ], 'false': [ { user: 'fred', age: 40, active: false } ] } */
Debug
Known issues
breakingThis package is `lodash._createaggregator` v3.0.0, originating from the Lodash v3 series. The main Lodash library has advanced to v4.x (currently v4.18.x), which introduced significant breaking changes. Direct usage of this v3 internal utility may be incompatible or behave unexpectedly when combined with modern Lodash versions or other contemporary JavaScript codebases.
fix
Avoid direct usage of this internal module. Instead, use the public API of the main `lodash` or `lodash-es` package (e.g., `_.groupBy`, `_.countBy`).
affects: >=3.0.0
deprecatedThis is an internal Lodash utility (indicated by the `_` prefix in its name) and is not intended for public consumption. It is not actively maintained as a standalone package and has not received updates since its v3.0.0 release in 2015. Relying on internal modules can lead to unexpected behavior and instability.
fix
Always prefer stable, public APIs provided by the main `lodash` package. If you need aggregation functionality, use `_.groupBy`, `_.countBy`, `_.reduce`, etc.
affects: >=3.0.0
breakingThis package is strictly a CommonJS module. It does not provide ES module exports. Attempting to use `import` statements will result in runtime errors in environments that do not automatically transpile CommonJS modules for ESM consumption.
fix
Use CommonJS `require()` syntax: `const createAggregator = require('lodash._createaggregator');`
affects: >=3.0.0
gotchaThis package likely contains unpatched security vulnerabilities. The main Lodash library has received numerous security fixes (e.g., prototype pollution fixes in v4.18.0, GHSA-f23m-r3pf-42rh) since this package's last update in 2015. Using an outdated, unmaintained internal module can expose your application to known exploits.
fix
Do not use this package. Upgrade to the latest stable version of the main `lodash` or `lodash-es` package and use its public API.
affects: >=3.0.0
gotchaTypeScript definitions are not available or maintained for this specific internal module. While `@types/lodash` provides types for the public API, you will likely encounter type errors or need to declare custom modules if you attempt to use this package in a TypeScript project.
fix
Avoid using this internal module. If forced to use it, provide a custom `declare module 'lodash._createaggregator';` or use `@ts-ignore` with extreme caution.
affects: >=3.0.0
Errors
Common errors & fixes
TypeError: createAggregator is not a function
Attempting to import `createAggregator` using ES module `import` syntax, but the package is a CommonJS module and does not expose named exports in that manner.
fix
Change your import statement to `const createAggregator = require('lodash._createaggregator');`
ERR_UNKNOWN_MODULE_FORMAT or Module not found: Error: Can't resolve 'lodash._createaggregator'
Using a modern bundler or Node.js environment configured strictly for ES modules without proper CommonJS interoperability, or the package is simply not found in the `node_modules`.
fix
Ensure your build tools (Webpack, Rollup, Vite) are configured to handle CommonJS modules. In Node.js ESM projects, if you must use it, consider dynamic `import('lodash._createaggregator')` (though `require` is generally preferred for such old CJS packages).
TypeError: Cannot read properties of undefined (reading 'x') or similar runtime errors in aggregation logic
The internal data structures, assumptions, or helper functions `createAggregator` relies on may have changed significantly in newer Lodash versions or other parts of your codebase, causing unexpected interactions or null/undefined access. This is common when mixing old internal modules with modern code.
fix
This is a strong indicator that this internal, outdated module is incompatible with your current environment. Cease using `lodash._createaggregator` and rewrite your logic using public Lodash APIs (e.g., `_.groupBy`, `_.reduce`) from a modern `lodash` package.
Upgrade
Version history
3.0.0latest on npm
Audit
Dependencies

No dependency data recorded yet.

Agent activity
2 hits · last 30 days
node
2
Resources
githubhttps://github.com/lodash/lodash ↗
packagehttps://www.npmjs.com/package/lodash._createaggregator ↗
homepagehttps://lodash.com/ ↗
lodash._createaggregator — npm install lodash._createaggregator · libregistry