/**
 * A utility function for conditionally joining css class names together.
 * @example cssClasses('spfx-app-dev', 'theme'); // => 'spfx-app-dev theme'
 * @example cssClasses('spfx-app-dev', { theme: false });  // => 'spfx-app-dev'
 * @example cssClasses({ 'spfx-app-dev': true });  // => 'spfx-app-dev'
 * @example cssClasses({ 'spfx-app-dev': false });  // => ''
 * @example cssClasses({ spfx-app-dev: true }, { theme: true }); // => 'spfx-app-dev theme'
 * @example cssClasses({ spfx-app-dev: true, theme: true });  // => 'spfx-app-dev theme'
 * @example cssClasses('spfx-app-dev', { theme: true, active: false }, 'item');  // => 'spfx-app-dev theme item'
 * @example cssClasses(null, false, 'spfx-app-dev', undefined, 0, 1, { theme: null }, '');  // => 'spfx-app-dev'
 * @example const arr = ['theme', { active: true, item: false }]; cssClasses('spfx-app-dev', arr);  // => 'spfx-app-dev theme active'
 * @since 1.0.0
 */
export default function cssClasses(...args: any[]): string;
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