@blofin/helper

A TypeScript utility library with modular architecture.

Features

• 📦 Modular Architecture: Organized by domain modules
• 🎯 Tree-shaking Support: Import only what you need
• 📚 TypeScript: Full type safety
• 🧪 Jest Testing: Comprehensive test coverage
• 📖 Storybook: Interactive documentation

Installation

pnpm add @blofin/helper
# or
npm install @blofin/helper
# or
yarn add @blofin/helper

Modules

calc

Calculation module using bignumber.js

import { add, subtract, multiply, divide, num } from '@blofin/helper/calc';

add(1, 2); // '3'
add(1, 2, 3, 4); // '10'
subtract(5, 3); // '2'
multiply(2, 3, 4); // '24'
divide(10, 2); // '5'
num('123.456'); // BigNumber instance

format

Formatting utilities

import { 
  formatNumber, 
  displayNumber, 
  useCurrency, 
  usePercent,
  compositeDisplayNumber,
  withCurrency,
  withThousand
} from '@blofin/helper/format';

// Core number formatting (returns number)
formatNumber(123.456, 2); // 123.46

// Display formatting (returns string)
displayNumber(1234.56, { currency: { symbol: '$' }, thousands: { enabled: true } }); 
// '$1,234.56'

// Quick entry functions
useCurrency(1234.56, '$'); // '$1,234.56'
usePercent(0.1234); // '12.34%'

// Composite display with function composition
compositeDisplayNumber(1123.133, useCurrency, withThousand()); 
// '$1,123.13'

storage

LocalStorage and SessionStorage utilities

import { 
  getLocalStorage, 
  setLocalStorage, 
  removeLocalStorage,
  getSessionStorage,
  setSessionStorage
} from '@blofin/helper/storage';

setLocalStorage('key', 'value');
const value = getLocalStorage('key'); // 'value'
removeLocalStorage('key');

setSessionStorage('sessionKey', 'sessionValue');
const sessionValue = getSessionStorage('sessionKey');

utils

General utility functions

import { isEmpty, deepClone } from '@blofin/helper/utils';

isEmpty(null); // true
isEmpty(''); // true
isEmpty([]); // true
isEmpty({}); // true
deepClone({ a: 1, b: { c: 2 } }); // { a: 1, b: { c: 2 } }

fp

Functional programming utilities

import { compose, pipe, curry, memoize, awaitEither } from '@blofin/helper/fp';

// Compose functions (right to left)
const add = (x: number) => x + 1;
const multiply = (x: number) => x * 2;
const composed = compose(multiply, add);
composed(5); // 12 (5+1 then *2)

// Pipe functions (left to right)
const piped = pipe(add, multiply);
piped(5); // 12 (5+1 then *2)

// Curry
const addCurried = curry((a: number, b: number) => a + b);
addCurried(1)(2); // 3

// Memoize
const expensiveFn = memoize((n: number) => n * n);
expensiveFn(5); // 25 (computed)
expensiveFn(5); // 25 (cached)

ui

UI components (React)

import { Countdown } from '@blofin/helper/ui';

<Countdown target={Date.now() + 60000} />

Usage

Full Import

import * as helper from '@blofin/helper';

helper.calc.add(1, 2); // '3'
helper.format.displayNumber(1234.56, { currency: { symbol: '$' } }); // '$1,234.56'
helper.utils.isEmpty(null); // true
helper.storage.setLocalStorage('key', 'value');

Module Import (Recommended)

import { add, multiply } from '@blofin/helper/calc';
import { displayNumber, useCurrency } from '@blofin/helper/format';
import { isEmpty, deepClone } from '@blofin/helper/utils';
import { compose, pipe } from '@blofin/helper/fp';

This approach enables tree-shaking, so only the imported modules will be bundled.

Development

Setup

pnpm install

Build

pnpm run build

Test

pnpm test
pnpm run test:watch
pnpm run test:coverage

Storybook

pnpm run storybook

Visit http://localhost:6006 to view the documentation.

Build Storybook

pnpm run build-storybook

Project Structure

blofin-helper/
├── src/
│   ├── calc/          # Calculation module
│   ├── format/      # Formatting module
│   ├── storage/       # Storage module
│   ├── utils/         # Utility functions
│   ├── fp/            # Functional programming
│   ├── ui/            # UI components
│   └── index.ts       # Main entry point
├── tests/             # Test files
├── stories/           # Storybook stories
├── dist/              # Build output
└── .storybook/        # Storybook configuration

License

MIT