Test if an object has a specified property.

Test if a value is a string.

Command-line interface.

Standard library error code database.

Read the entire contents of a file.

Invert an object, such that keys become values and values become keys.

Insert supplied variable values into a format string.

Format an error message for production.

Check if the runtime is a web browser.

Boolean indicating if the current process is running on Windows.

Return an error message corresponding to a provided two-character error identifier.

Absolute pathname of the executable which started the current Node.js process.

tap-producing test harness for node and browsers

Yet another JS code coverage tool that computes statement, line, function and branch coverage with module loader hooks to transparently add coverage when running tests. Supports all JS coverage use ca

Minimal TAP output formatter.

Benchmark harness.