prelude.ls is a functionally oriented utility library. It is powerful and flexible. Almost all of its functions are curried. It is written in, and is the recommended base library for, LiveScript.

Returns true if an object was created by the `Object` constructor, or Object.create(null).

Error constructor for test and validation frameworks that implements standardized AssertionError specification.

Returns true if a value is a plain object, array or function.

ES2015-compliant shim for Object.is - differentiates between -0 and +0

Check if the process is running inside a container (Docker/Podman)

Check whether a given string matches the `PotentialCustomElementName` production as defined in the HTML Standard.

Public logs API for OpenTelemetry

Cooperative scheduler for the browser environment.

The Babel Traverse module maintains the overall tree state, and is responsible for replacing, removing, and adding nodes

Reliably determines if the code is running in Node.js

Write files in an atomic fashion w/configurable ownership

Detect if the current environment is a CI server

Returns true if a value has the characteristics of a valid JavaScript accessor descriptor.

Check if something is a generator function

fs read and write streams based on minipass

Returns true if a value has the characteristics of a valid JavaScript data descriptor.

Determine if an object is a Buffer

Node is running but you don't know why? why-is-node-running is here to help you.

fs read and write streams based on minipass