Overview

A lightweight, production-ready, dependency-free TypeScript utility library designed for modern JavaScript and TypeScript environments.

Welcome to sc-fns

sc-fns is a high-performance, zero-dependency utility toolkit written from the ground up in strict TypeScript. It delivers over 60+ battle-tested utility functions organized across 11 clean module namespaces.

bash
pnpm add sc-fns

Why sc-fns?

Modern JavaScript runtimes (Node.js 18+, Bun, Deno, and modern evergreen browsers) now provide native web standards like crypto.randomUUID, Intl, URL, and structuredClone. However, day-to-day application development still requires clean, predictable helper functions for string sanitization, array manipulation, date calculations, object transformations, and input validation.

Most existing utility libraries either:

Carry heavy legacy compatibility shims and complex internal dependency chains.
Force you to pull in hundreds of transitive dependencies.
Lack first-class TypeScript types or proper modern ESM exports.

sc-fns solves this with a zero-dependency, tree-shakeable, and TypeScript-first design.

Core Pillars

🚀 Zero Runtime Dependencies: Zero external dependencies. No supply chain vulnerabilities or unexpected bloat.
💎 100% TypeScript Strict: Written in strict TypeScript with comprehensive generics and inline JSDoc comments.
📦 Dual ESM & CommonJS: Full hybrid bundle support for both modern import and legacy Node require().
🌲 Subpath Tree-Shaking: Import only what you need from specific subpaths (e.g. sc-fns/string, sc-fns/array) to keep bundles minimal.
🛡️ Non-Mutating & Pure: Functions never mutate your input arrays or objects in place.
🌐 Modern Web Standards: Native web standard APIs used wherever available with cross-platform fallbacks.

Available Modules

Module	Subpath Import	Description
String	`sc-fns/string`	Slugify, word casing, whitespace normalization, masking, and truncation
ID & Random	`sc-fns/id`	RFC 4122 v4 UUID, short IDs, numeric OTP, and random number generators
Array	`sc-fns/array`	Chunking, deduplication, Fisher-Yates shuffling, grouping, and flattening
Number	`sc-fns/number`	Clamping, Intl number formatting, rounding to precision, percentages
Object	`sc-fns/object`	`pick`, `omit`, `deepClone`, `deepMerge`, and clean undefined/null values
Date	`sc-fns/date`	Custom date formatting, relative time calculation, calendar helpers
Validation	`sc-fns/validation`	Fast validators for email, URL, UUID, JSON, and runtime type guards
URL	`sc-fns/url`	URL builders, query param serializers, domain, and path extractors
Common & Async	`sc-fns/common`	`debounce`, `throttle`, `retry`, `sleep`, `timeout`, and `once`
File	`sc-fns/file`	File size formatting (KB/MB/GB), extension extractors, and MIME checks
Browser	`sc-fns/browser`	Clipboard copy, cookie management, and client-side helpers

Next Steps

Check out the Installation Guide to install sc-fns in your project.
Read Import Styles & Tree-Shaking to learn how to optimize bundle size.
Explore the Module API Reference for detailed function signatures and examples.

How is this guide?

Last updated on October 25, 2026

Community & Support