Test All Versions

The `test-all-versions` package is a Node.js CLI tool designed to run a project's test suite against all published versions of one or more specified npm dependencies. It helps ensure backward compatibility of libraries by automating the arduous process of testing across a matrix of dependency versions. Currently stable at version 6.2.0, the tool is primarily configured via a `.tav.yml` file, allowing for advanced scenarios such as testing against specific Node.js version ranges, handling peer dependencies, running multiple test commands, defining `preinstall`/`pretest`/`posttest` hooks, and configuring environment variable matrices for comprehensive testing. Its release cadence appears active, indicated by its 6.x version, though a specific schedule isn't published. It differentiates itself from general CI/CD solutions by specifically targeting and simplifying dependency version compatibility testing, making it an invaluable tool for library maintainers.