/**
 * Determines if provided string value is blank (whitespace, empty, `undefined`, `null`)
 *
 * @param value - value to be evaluated
 * @returns `true` if blank; otherwise `false`
 *
 * @category Utilities
 */
export declare function isBlank(value: string | undefined | null): boolean;
/**
 * Determines if provided string value is not blank (not whitespace, empty, `undefined`, `null`)
 *
 * @param value - value to be evaluated
 * @returns `true` if not blank; otherwise `false`
 *
 * @category Utilities
 */
export declare function isNonBlank(value: string | undefined | null): boolean;
/**
 * Returns the provided value with the first character capitalized and remaining characters untouched
 *
 * @param value - string value to capitalize
 * @returns the provided value with the first letter capitalized
 *
 * @category Utilities
 */
export declare function upperFirst(value: string): string;
/**
 * Returns the provided value with the first character un-capitalized and remaining characters untouched
 *
 * @param value - string value to un-capitalize
 * @returns the provided value with the first letter un-capitalized
 *
 * @category Utilities
 */
export declare function lowerFirst(value: string): string;
/**
 * Determines if the provided value is "empty"
 *
 * @remarks
 * Both `null` and `undefined` are considered "empty". Arrays and `string`s are empty if their `length`
 * property is 0. FHIR data models (data types or resources) have the `isEmpty()` method to determine
 * if they are empty. While rarely used in this library, `Map` and `Set` objects are empty is their
 * `size` property is 0. Object types are empty if `Object.keys(value).length === 0`. Other types such as
 * `number`, `boolean`, `BigInt`, etc. are never considered "empty" and will always return `false`.
 *
 * @param value - value to be evaluated
 * @returns `true` if `value` is empty, otherwise `false`
 *
 * @category Utilities
 */
export declare function isEmpty(value: unknown): boolean;
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