komoji/esm/index.js

the tiny case transformer — effortlessly transform strings between naming conventions

export function toPascalCase(str) {
    return str
        .replace(/(^|_|\s|-)(\w)/g, (_, __, letter) => letter.toUpperCase())
        .replace(/[_\s-]/g, '');
}
export function toCamelCase(key, stripLeadingNonAlphabetChars = false) {
    if (stripLeadingNonAlphabetChars) {
        // First, remove all leading non-alphanumeric characters (preserves numbers)
        key = key.replace(/^[^a-zA-Z0-9]+/, '');
    }
    return key
        // Convert what follows a separator into upper case
        .replace(/[-_\s]+(.)?/g, (_, c) => c ? c.toUpperCase() : '')
        // Ensure the first character of the result is always lowercase
        .replace(/^./, (c) => c.toLowerCase());
}
// // Determine if the key is a valid JavaScript identifier
export function isValidIdentifier(key) {
    return /^[$A-Z_][0-9A-Z_$]*$/i.test(key) && !/^[0-9]+$/.test(key);
}
// Determine if the key is a valid JavaScript-like identifier, allowing internal hyphens
export function isValidIdentifierCamelized(key) {
    return (/^[$A-Z_][0-9A-Z_$-]*$/i.test(key) &&
        !/^[0-9]+$/.test(key) &&
        !/^-/.test(key));
}
export function toSnakeCase(str) {
    return str
        // Insert an underscore before the last capital in a sequence of capitals followed by a lowercase letter
        .replace(/([A-Z]+)([A-Z][a-z])/g, '$1_$2')
        // Insert an underscore between lower and upper case letters
        .replace(/([a-z])([A-Z])/g, '$1_$2')
        // Insert an underscore between letters and numbers
        .replace(/([a-zA-Z])(\d)/g, '$1_$2')
        .replace(/(\d)([a-zA-Z])/g, '$1_$2')
        // Replace spaces, hyphens, and existing underscores with single underscore
        .replace(/[\s-]+/g, '_')
        // Remove multiple consecutive underscores
        .replace(/_+/g, '_')
        // Remove leading/trailing underscores and convert to lowercase
        .replace(/^_+|_+$/g, '')
        .toLowerCase();
}
export function toKebabCase(str) {
    return str
        // Insert a hyphen before the last capital in a sequence of capitals followed by a lowercase letter
        .replace(/([A-Z]+)([A-Z][a-z])/g, '$1-$2')
        // Insert a hyphen between lower and upper case letters
        .replace(/([a-z])([A-Z])/g, '$1-$2')
        // Insert a hyphen between letters and numbers
        .replace(/([a-zA-Z])(\d)/g, '$1-$2')
        .replace(/(\d)([a-zA-Z])/g, '$1-$2')
        // Replace spaces, underscores, and existing hyphens with single hyphen
        .replace(/[\s_]+/g, '-')
        // Remove multiple consecutive hyphens
        .replace(/-+/g, '-')
        // Remove leading/trailing hyphens and convert to lowercase
        .replace(/^-+|-+$/g, '')
        .toLowerCase();
}
export function toConstantCase(str) {
    return str
        // Insert an underscore before the last capital in a sequence of capitals followed by a lowercase letter
        .replace(/([A-Z]+)([A-Z][a-z])/g, '$1_$2')
        // Insert an underscore between lower and upper case letters
        .replace(/([a-z])([A-Z])/g, '$1_$2')
        // Insert an underscore between letters and numbers
        .replace(/([a-zA-Z])(\d)/g, '$1_$2')
        .replace(/(\d)([a-zA-Z])/g, '$1_$2')
        // Replace spaces, hyphens, and existing underscores with single underscore
        .replace(/[\s-]+/g, '_')
        // Remove multiple consecutive underscores
        .replace(/_+/g, '_')
        // Remove leading/trailing underscores and convert to uppercase
        .replace(/^_+|_+$/g, '')
        .toUpperCase();
}