easy_validation-package

A simple validation package for TypeScript, providing various validation functions and error handling.

Installation

You can install easy_validation-package via npm:

npm install easy_validation-package

Usage

Importing

Import the validation functions and ValidationError class into your TypeScript file:

import { validateAndLog, isString, isNumber, ValidationError } from 'easy_validation-package';

Using Validation Functions

Example usage of validation functions:

try {
    validateAndLog('String', isString, 'Hello'); // Valid string
    validateAndLog('String', isString, 123);    // Throws ValidationError: Value must be a string

    validateAndLog('Number', isNumber, 456);    // Valid number
    validateAndLog('Number', isNumber, 'ABC');  // Throws ValidationError: Value must be a number
} catch (error) {
    if (error instanceof ValidationError) {
        console.error('Validation failed:', error.message);
    } else {
        console.error('Unexpected error occurred:', error);
    }
}

Customizing Validation

You can create your own validation functions and use them with validateAndLog:

function isEmail(value: any): boolean {
    const pattern = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
    if (typeof value !== 'string' || !pattern.test(value)) {
        throw new ValidationError('Invalid email format');
    }
    return true;
}

try {
    validateAndLog('Email', isEmail, '[email protected]');    // Valid email
    validateAndLog('Email', isEmail, 'invalid-email');      // Throws ValidationError: Invalid email format
} catch (error) {
    if (error instanceof ValidationError) {
        console.error('Validation failed:', error.message);
    } else {
        console.error('Unexpected error occurred:', error);
    }
}

Error Handling

Ensure to handle ValidationError specifically for validation errors:

try {
    // Validation code here
} catch (error) {
    if (error instanceof ValidationError) {
        console.error('Validation failed:', error.message);
        // Handle validation error appropriately
    } else {
        console.error('Unexpected error occurred:', error);
        // Handle unexpected errors
    }
}

Contributing

Contributions are welcome! Please fork the repository and submit a pull request.

License

This project is licensed under the MIT License - see the LICENSE file for details.