useddepends

Useddepends refers to the portion of a software project's declared dependencies that are actually used at runtime. It helps distinguish theoretical requirements from real-world usage, capturing which libraries, modules, or services are exercised when the program runs under typical workloads.

It is used to reduce dependency bloat, lower security risk, and simplify licensing and distribution. By identifying unused or redundant dependencies, teams can streamline builds, shrink installation footprints, and improve startup times. It also informs decisions about feature flags and packaging policies.

Measurement typically relies on runtime analysis: instrumented builds, dynamic tracing, and sampling of executed import, require, or load calls. Static analysis may supplement this by correlating code paths with feature flags. Results can be environment-specific and may require repeatable benchmarks to be meaningful.

Challenges include optional or conditional loading, plugins, dynamic code generation, and separate build versus runtime environments. Variability across platforms, languages, and user configurations can complicate conclusions. Additionally, configuring experiments to distinguish true usage from incidental imports requires careful design and representative workloads.

Related concepts include dead or unused dependencies, and dependency pruning in package managers and build systems. Useddepends data can guide packaging, licensing audits, and maintenance planning, especially for complex ecosystems such as web, mobile, and containerized applications.