Assert that a value is truthy

ESLint’s official `tap` formatter, unofficially published as a standalone module

Fast checking of top level dependencies based on version numbers

Extract the first JSON object or array from a string

Extends Chai with assertions for the Sinon.JS mocking framework.

Type definition package for textlint

Type safe error handling.

Check the engines and platform fields in package.json

Give a regex, get a robust predicate function that tests it against a string.

hint that that checks if HTML document only response headers are sent for other resources

A fetch with Response abilities.

TypeScript type-level CRON expression validator

A 373-byte Spec-Compliant Runtime-Only Implementation of the ECMAScript Try Operator Proposal Result class

Checks package.json main and bin paths

the lightest yet the fastest javascript testing library

Load node modules according to tsconfig paths, in run-time or via API.

code coverage command con coverify

Rust-like Option and Result for TypeScript with near-zero allocations for extreme performance

hint for media types (f.k.a. MIME types) related best practices

Implementation of newtypes in TypeScript