/**
 * Parses a widget boolean attribute, treating only the literal string `'true'`
 * as true. An absent or blank value yields the provided default.
 * @param {string | null | undefined} value - The raw attribute value.
 * @param {boolean} defaultValue - The value to use when absent or blank.
 * @returns {boolean} The parsed boolean.
 */
export declare const parseBooleanAttribute: (value: string | null | undefined, defaultValue: boolean) => boolean;
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