Is

What it is

A utility for type checking values in JavaScript and TypeScript. It simplifies the process of verifying types, making it easier to write robust code that handles different data types gracefully.

Provides a lightweight and reliable way to check types in JavaScript and TypeScript, making it easier for developers to write robust code without the overhead of more complex solutions.

When it fits — and when it doesn’t

Known weaknesses

Each one links to the public issue, changelog or docs page it came from, where we have one.

1. 01

   Limited support for complex type checking

   @sindresorhus/is primarily supports basic types and does not handle more complex type structures or custom objects well.

2. 02

   No built-in error handling

   The tool returns boolean values for type checks without providing context on why a check failed, which can complicate debugging.

3. 03

   Does not support all JavaScript/TypeScript types out of the box

   @sindresorhus/is lacks native support for newer or less common types like symbols and maps without additional configuration.

What it does well

• Simplified type checking for various data types.

• Extensive test coverage to ensure reliability.

• Lightweight and easy to integrate into projects.

Pricing

Free tier

YesOpen source — free to use

Paid from

$0

Model

Flat rate

Enterprise plan

No

Pricing not independently confirmed — check the vendor’s page.