import type { FormattedPrimitiveTypeCreator } from '../types.js';
/**
 * Checks whether a string is a valid itemprop property name.
 *
 * @see https://html.spec.whatwg.org/multipage/microdata.html#defined-property-name
 *
 * > The rules above disallow U+003A COLON characters (:) in non-URL values
 * > because otherwise they could not be distinguished from URLs.
 * > Values with U+002E FULL STOP characters (.) are reserved for future extensions.
 * > ASCII whitespace are disallowed because otherwise the values would be parsed as multiple tokens.
 *
 */
export declare const isItempropName: FormattedPrimitiveTypeCreator;