case-text-utils/src/toSnake.js

A tiny, dependency-free utility to convert string cases like camelCase, snake_case, kebab-case, PascalCase, Title Case, UPPER_CASE, and more.

export function toSnake(str = '') {
    return str
        .replace(/([a-z])([A-Z])/g, '$1_$2')
        .replace(/[-\s]/g, '_')
        .toLowerCase();
}