{"library":"is","type":"library","category":null,"description":"The `is` library is a lightweight, comprehensive JavaScript utility designed for type and value testing. It provides a rich API to determine the type or specific characteristics of a variable, offering functions like `is.string()`, `is.array()`, `is.empty()`, `is.equal()`, and many more for common JavaScript types and states. Currently stable at version 3.3.2, the package maintains a steady but not rapid release cadence, primarily focusing on bug fixes and dependency updates. Its key differentiator is the extensive, declarative API that simplifies complex type checks, often replacing verbose `typeof` or `instanceof` chains, making code more readable and robust. It's widely used in both Node.js and browser environments for input validation, conditional logic, and defensive programming.","language":"javascript","status":"maintenance","version":"3.3.2","tags":["javascript","util","type","test"],"last_verified":"Wed May 27","install":[{"cmd":"npm install is","imports":["import is from 'is';","import is from 'is';\nis.string('hello');","import is from 'is';\nif (is.defined(myVar)) { /* ... */ }"]},{"cmd":"yarn add is","imports":[]},{"cmd":"pnpm add is","imports":[]}],"homepage":null,"github":"https://github.com/enricomarino/is","docs":null,"changelog":null,"pypi":null,"npm":"https://www.npmjs.com/package/is","openapi_spec":null,"status_page":null,"smithery":null,"compatibility":{"summary":{"python_range":"18–22","success_rate":0,"avg_install_s":null,"avg_import_s":null,"wheel_type":null},"url":"https://checklist.day/v1/registry/is/compatibility"}}