/**
 * Parses a widget string attribute, returning the default (or undefined) when
 * the value is absent or blank.
 * @param {string | null | undefined} value - The raw attribute value.
 * @param {string} [defaultValue] - The value to use when absent or blank.
 * @returns {string | undefined} The string value, the default, or undefined.
 */
export declare const parseStringAttribute: (value: string | null | undefined, defaultValue?: string) => string | undefined;
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