/**
 * Parses a widget attribute constrained to a known set of values. Trims the
 * input and returns the default when it is blank or not one of `validValues`.
 * @template T The string-literal union of accepted values.
 * @param {string | null | undefined} value - The raw attribute value.
 * @param {readonly T[]} validValues - The accepted values.
 * @param {T} defaultValue - The value to use when invalid or blank.
 * @returns {T} The validated value.
 */
export declare const parseEnumAttribute: <T extends string>(value: string | null | undefined, validValues: readonly T[], defaultValue: T) => T;
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