text-is-upper-case/dist.es2015/index.js

Returns `true` if text is upper case only.

/**
 * Returns a boolean indicating whether text is upper case.
 */
export function isUpperCase(input) {
    // Handle null/undefined inputs gracefully
    if (!input)
        return false;
    return input.toUpperCase() === input && input.toLowerCase() !== input;
}