Helpers Library

📚 Summary

@heliomarpm/helpers is a comprehensive collection of TypeScript utility functions for formatting, type checking, conversion, and general utilities. This library provides a set of helper functions to make common programming tasks easier and more maintainable.

Requirements

• Node.js v16+

🚀 Features

• Type checking utilities (is.ts)
• String and data formatting helpers (format.ts)
• Type conversion functions (to.ts)
• General utility functions (utils.ts)
• Fully typed with TypeScript
• Zero dependencies
• Tree-shakeable exports
• CommonJS and ES Module support

📦 Installation

You can install the library using npm or yarn:

npm i @heliomarpm/helpers
# or 
yarn add @heliomarpm/helpers

🔧 Basic Usage

To use the library in a TypeScript or modern JavaScript project, you can import it directly:

import { Is, To, Format, Utils } from '@heliomarpm/helpers';

// Type checking
Is.CPF('111.222.333-00'); // false
Is.CNPJ('11.222.333/0001-00'); // false

// Conversion
To.boolean('1'); // true
To.boolean('false'); // false
To.boolean('invalid'); // false

// Formatting
Format.date('2025-03-02', 'dddd, dd mmmm yyyy', 'en-US'); // "Sunday, 02 March 2025"
Format.ptBr.valorPorExtenso(100_000); // "cem mil"

// General utilities
Utils.getNestedValue({ user: { name: { first: 'John' } }}, "user.name.first"); // "John"

const target = {user: {name: {first: 'John',last: 'Doe'} } };

Utils.setNestedValue(target, "user.name.first", "Jane"); 
Utils.setNestedValue(target, 'user.name.first', 'Jane');
Utils.setNestedValue(target, 'children[0].name', 'John');
Utils.setNestedValue(target, 'animals[0]', 'dog');
Utils.setNestedValue(target, 'animals[1]', 'cat');

// output will be target:
{ 
  user: { name: { first: 'Jane', last: 'Doe' } }, 
  children: [{ name: 'John' }], 
  animals: ['dog', 'cat'] 
}

🚀 Main functionalities

Import utilities directly:

import { Format, Is, To, Utils } from '@heliomarpm/helpers';

📚 API Reference

Format Helpers

Brazilian Formats (ptBr)

Format.ptBr.cnpj('12345678901234'); // Formatar CNPJ '12.345.678/9012-34'
Format.ptBr.cnpj('1234567890123400', 'CNPJ não pode ser formatado'); // 'CNPJ não pode ser formatado'

Format.ptBr.cpf('12345678901'); // '123.456.789-01'
Format.ptBr.cpf('1234567890100', 'CPF não pode ser formatado'); // 'CPF não pode ser formatado'

Format.ptBr.cep('12345678'); // '12345-678'
Format.ptBr.cep('1234567800', 'CEP não pode ser formatado'); // 'CEP não pode ser formatado'

Format.ptBr.telefone('11999999999'); // '11 99999-9999'
Format.ptBr.telefone('1199999999900', 'Telefone não pode ser formatado'); // 'Telefone não pode ser formatado'
Format.ptBr.valorPorExtenso(1234); // 'mil duzentos e trinta e quatro'

Date Formatting

Format.date(new Date(), 'dd/mm/yyyy HH:MM:ss'); // '31/12/2023 23:59:59'
Format.date('2025-03-02', 'dddd, dd mmmm yyyy', 'en-US'); // "Sunday, 02

Supported formats are:

/**
 * @param {string} format - The desired format for the output string.
 * - 'a': 'am' or 'pm' in lowercase
 * - 'A': 'AM' or 'PM' in uppercase
 * - 'hh': two-digit hours in 12h format (01-12)
 * - 'h': hours in 12h format (1-12)
 * - 'HH': two-digit hours in 24h format (00-23)
 * - 'H': hours in 24h format (0-23)
 * - 'MM': two-digit minutes (00-59)
 * - 'ss': two-digit seconds (00-59)
 * - 'SSS': three-digit milliseconds (000-999)
 * - 'yyyy': four-digit year (2024)
 * - 'yy': two-digit year (24)
 * - 'mmmm': full month name (January, February, ...)
 * - 'mmm': full month name abbreviated month (Jan, Feb, ...)
 * - 'mm': two-digit month (01-12)
 * - 'dddd': full weekday name (Sun, Mon, ...)
 * - 'ddd': abbreviated weekday name (Sun, Mon, ...)
 * - 'dd': two-digit day (01-31)
 */

Number Formatting

// Format currency
Format.currency(1234.56, { locale: 'en', currency: 'USD' }); // '$1,234.56'

// Formating number (1.234,56)
Format.number(1234.56); // '1.234,56'

// Abreviate number (1.23K, 1.23M, etc.)
Format.abbreviateNumber(1234567); // '1.23M'

// Remove non-numeric characters from a string.
Format.onlyNumbers('abc123'); // '123'

// Pads a number with leading zeros to match the number of digits in a given maximum value
Format.padZerosByRef(5, 100); // '005'

String Formatting

// Capitalizes the first letter of a string
Format.titleCase('john doe'); // 'John Doe'
Format.titleCase('MARIA DA SILVA'); // 'Maria da Silva'

// Slugify a string
Format.slugify('Hello, World!'); // 'hello-world'

// Mask a part of a string with a single character
Format.maskIt('1234567890', 3, 6, '*'); // '123****890'
Format.maskItParts('Heliomar P. Marques', '*', 1); // 'H******* P. M******'

// Truncates a given text to a maximum length and appends an ellipsis
Format.truncate('Hello, world!', 9, 'ooo!'); // 'Helloooo!'
Format.truncate('Short text', 10, "..."); // 'Short text'

// Interpolates a string with values
Format.interpolate('Hello, {name}!', { name: 'John' }); // 'Hello, John!'
Format.interpolate('The division of {0} by {1} is {1}.', 4, 2); // 'The division of 4 by 2 is 2.'

Is Helpers (Type Checking)

Is.cpf('123.456.789-01'); // Validates CPF
Is.cnpj('12.345.678/9012-34'); // Validates CNPJ, can be in '12.345.678/9012-34' or '12345678901234'
Is.cnpj('12.ABC.345/01DE-35'); //after 2026, the CNPJ will transition to a new format with letters and numbers
Is.numeric('123'); // true
Is.equals(obj1, obj2); // Deep comparison
Is.date('2023-12-31'); // Validates date
Is.dateBetween(new Date('2022-01-15'), new Date('2022-01-01'), new Date('2022-01-31')); // Checks if a date is between min and max
Is.nullOrEmpty(value); // Checks for null/empty
Is.object({}); // Validates object type
Is.email('user@example.com'); // Validates email
Is.odd(123); // Checks if a number is odd
Is.even(123); // Checks if a number is even
Is.uuid('12345678-1234-1234-1234-123456789012'); // Validates UUID
Is.promise(new Promise(() => {})); // Checks if a value is a promise
Is.function(() => {}); // Checks if a value is a function
Is.url('https://example.com'); // Validates URL
Is.json('{"name": "John", "age": 30}'); // Validates JSON

// OS and Architecture checks
Is.plataform.windowsOS
Is.plataform.linuxOS
Is.plataform.macOS
Is.plataform.arch_x86
Is.plataform.arch_x64
Is.plataform.arch_Arm
Is.plataform.arch_Arm64

To Helpers (Conversion)

To.dictionary(jsonObject); // Converts to Record<string, T>
To.boolean('true'); // Converts to boolean
To.dateParts(new Date()); // Extracts date components
To.date(1793456000000); // Converts to Date
To.number('123'); // Converts to number

Utils Helpers

Utils.gerarCPF(); // Generates valid CPF
Utils.gerarCNPJ(); // Generates valid CNPJ
Utils.sortBy(['name', '-age']); // Sort function for arrays
Utils.orderBy(array, 'key', 'asc'); // Sort array by key
Utils.groupby([{ name: 'Alice', age: 30 }, { name: 'Bob', age: 25 }], (person) => person.age); // Group array by key (e.g. { 25: [{ name: 'Bob', age: 25 }], 30: [{ name: 'Alice', age: 30 }] }); 
Utils.chunk([1, 2, 3, 4, 5], 2); // Chunk array into smaller arrays (e.g. [[1, 2], [3, 4], [5]])
Utils.getNestedValue(obj, 'user.name'); // Get nested object value
Utils.setNestedValue(obj, 'user.name', value); // Set nested object value
Utils.ifNull(value, defaultValue); // Null coalescing
Utils.ifNullOrEmpty(value, value2, defaultValue); // Returns the first non-null, non-undefined, and non-empty value from the given arguments.
Utils.generateUUIDv4(); // Generates UUID v4 (e.g '9b1deb4d-3b7d-4bad-9bdd-2b0d7b3dcb6d')
Utils.months({locale: 'pt-BR', month: 'long'}); // Get month names array (e.g. ['Janeiro', 'Fevereiro', ...])
Utils.weekdays({locale: 'pt-BR', weekday: 'long'}); // Get weekday names array (e.g. ['Domingo', 'Segunda-feira', ...])
Utils.dayOfYear("2025-02-15") // Get day of year (e.g. 46) 
Utils.weekOfYear("2022-01-01") // Get week of year (e.g. 52)); 

Utils.sleep(1000); // Sleep for 1 second
Utils.retry(fn, {retries: 5, delay: 500, onRetry: (error, attempt) => console.log(`Attempt ${attempt} failed with error ${error.message}`)}); // Retry function
Utils.memoize(fn); // Memoize function
Utils.debounce(fn, 100); // Debounce function
Utils.throttle(fn, 100); // Throttle function
Utils.once(fn); // Once function
Utils.pipe(fn1, fn2, fn3); // Pipe function
Utils.compose(fn1, fn2, fn3); // Compose function
Utils.randomNum(1, 10); // Random number between 1 and 10
Utils.clamp(5, 1, 10); // Clamp number between 1 and 10 (e.g. 5)
Utils.omit({ id: 1, name: 'John', age: 30, email: 'dL5mW@example.com' }, ['name', 'age']); // Omit object properties (e.g. { id: 1, email: 'dL5mW@example.com' })
Utils.deepOmit({ id: 1, items: [{  name: 'item 1' }, {  name: 'item 2' }] }, ['items.0']);  // Deep omit object properties (e.g. { id: 1, items: [{  name: 'item 2' }] })
Utils.pick({ id: 1, name: 'John', age: 30, email: 'dL5mW@example.com' }, ['name', 'age']); // Pick object properties (e.g. { name: 'John', age: 30 })
Utils.deepPick({ id: 1, items: [{  name: 'item 1' }, {  name: 'item 2' }] }, ['items.0']);  // Deep pick object properties (e.g. { id: 1, items: [{  name: 'item 1' }] })

// Crypto utilities
Utils.crypto.generateKey(); // Generate encryption key
Utils.crypto.encrypt(text, key); // Encrypt text
Utils.crypto.decrypt(encryptedText, key); // Decrypt text

📦 Project Scripts

• npm run check — runs formatter, linter and import sorting to the requested files
• npm run format — run the formatter on a set of files
• npm run lint — run various checks on a set of files
• npm run test — run unit tests
• npm run test:c — run unit tests with coverage
• npm run docs:dev — run documentation locally
• npm run commit - run conventional commits check
• npm run release:test — dry run semantic release
• npm run build — build library

📦 Dependencies

✅ Zero runtime dependencies | Lightweight & secure
🔄 All devDependencies are pinned to latest stable versions

🤝 Contributing

We welcome contributions! Please read:

• Code of Conduct
• Contributing Guide

Thank you to everyone who has already contributed to the project!

Made with contrib.nn.

❤️ Support this project

If this project helped you in any way, there are several ways to contribute.
Help us maintain and improve this template:

⭐ Starring the repository
🐞 Reporting bugs
💡 Suggest features
🧾 Improving the documentation
📢 Share with others

💵 Supporting via GitHub Sponsors, Ko-fi, Paypal or Liberapay, you decide. 😉

📝 License

MIT © Heliomar P. Marques 🔝

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