lodash.isfunction

This package does exactly one thing: checks if a value is a function. In production, you'll quickly discover it hasn't been updated since 2018 and uses outdated detection logic that struggles with async functions, generators, and proxies. The implementation predates modern JavaScript standards and can produce false negatives with cross-realm functions (iframes, multiple execution contexts).

From an operations perspective, this is dead weight. It adds a dependency with no observability hooks, no configuration options, and no error handling beyond basic type checking. The runtime performance is fine for the trivial task it performs, but native `typeof value === 'function'` is both faster and sufficient for 95% of use cases. Memory footprint is negligible, but so is the value proposition.

The real issue is maintenance risk. Pulling in an unmaintained package for a single trivial check creates supply chain exposure with zero upside. You're better off writing a two-line utility function tailored to your needs or using a maintained alternative. There's no retry logic, timeout configuration, or resource management because there's nothing to manage—it's just a stale type check.

This package exports only the `_.isFunction` method from Lodash, which checks if a value is a function. While it works as advertised, it's essentially frozen in time - last updated in 2018 with version 3.0.9, while Lodash itself is on version 4+. This creates version mismatches if you're using other Lodash packages.

The actual implementation is trivial enough that you're better off using native JavaScript (`typeof value === 'function'`) or importing from the full Lodash package. The package has virtually no documentation beyond a brief README linking to Lodash docs, which makes onboarding feel unnecessarily indirect. Error messages are basic JavaScript runtime errors with no helpful context.

The main issue is that this micro-package approach adds dependency bloat for something JavaScript handles natively. Debugging is straightforward since there's barely any code, but you're more likely debugging why you have version conflicts with other Lodash modules. The learning curve is non-existent, but that's because there's nothing to learn - it's literally one function call.

This package exports a single Lodash method for checking if a value is a function. In practice, it's a 6KB dependency that solves a problem JavaScript's native `typeof` handles in 99% of cases. The package hasn't been updated since 2018 and uses CommonJS-only exports, making it awkward in modern ES module environments.

The API itself is straightforward - just `isFunction(value)` - but it lacks TypeScript type definitions in the package itself (you need @types/lodash separately). The function handles edge cases like generators and async functions, but modern `typeof value === 'function'` works identically for standard use cases. There's minimal documentation beyond JSDoc comments, and no examples of when you'd actually need this over native checks.

The real issue is maintenance: this predates modern JavaScript features and cross-realm concerns it tries to solve are rarely encountered. You're adding a dependency that needs security scanning and version management for functionality that's essentially built into the language.