arr-union

Combines a list of arrays, returning a single array with unique values, using strict equality for comparisons.

append-transform

Install a transform to `require.extensions` that always runs last, even if additional extensions are added later.

mergician

Uniquely flexible and light-weight utility for cloning and deep (recursive) merging of JavaScript objects. Supports descriptor values, accessor functions, and custom prototypes. Provides advanced options for customizing the clone/merge process.