backports

The backports package provides implementations of functions and function arguments that were introduced in newer versions of base R, allowing package developers to use modern R features while maintaining compatibility with older R installations. When a package imports backports, R automatically uses the native version if available or falls back to the backported implementation for older R versions.

This package is particularly valuable for maintaining backward compatibility without writing conditional code or sacrificing access to useful new functions. It includes backports for dozens of base R functions introduced from version 3.2.0 through 4.3.0, such as dir.exists(), startsWith(), isFALSE(), and deparse1(). Package developers can import all backports or selectively import only the specific functions they need, making it easy to support users running older R versions without duplicating implementation code.