core-util-is provides type checking functions, mirroring Node.js's internal util.is* methods but usable in browser environments. This package enables developers to reliably determine the type of JavaScript values – like arrays, dates, errors, and more – across different JavaScript runtimes, ensuring consistent behavior. It's a lightweight dependency focused exclusively on resolving type checking, improving code robustness where type verification is essential. Use it for code which runs both in Node.js and browsers for consistent type results.