/**
 * Determines if a value is null or undefined.
 *
 * @template T
 *
 * @param {T | null | undefined} value The value to check.
 * @return {value is T} Whether value is not null or undefined.
 */
export function isValueDefined<T>(value: T | null | undefined): value is T;
/**
 * Determines if a value is empty, null, or undefined.
 *
 * @template T
 *
 * @param {T | "" | null | undefined} value The value to check.
 * @return {value is T} Whether value is empty.
 */
export function isValueEmpty<T>(value: "" | T | null | undefined): value is T;
/**
 * Get the first defined/non-null value from an array.
 *
 * @template T
 *
 * @param {Array<T | null | undefined>} values        Values to derive from.
 * @param {T}                           fallbackValue Fallback value if there are no defined values.
 * @return {T} A defined value or the fallback value.
 */
export function getDefinedValue<T>(values: (T | null | undefined)[] | undefined, fallbackValue: T): T;
/**
 * Checks to see if a value is a numeric value (`number` or `string`).
 *
 * Intentionally ignores whether the thousands delimiters are only
 * in the thousands marks.
 *
 * @param {any}    value
 * @param {string} [locale]
 * @return {boolean} Whether value is numeric.
 */
export function isValueNumeric(value: any, locale?: string | undefined): boolean;
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