import { type FirstLetterLowercase, type FirstLetterUppercase, type PartialWithUndefined } from '@augment-vir/core';
/**
 * The different string cases.
 *
 * @category String
 * @category Package : @augment-vir/common
 * @package [`@augment-vir/common`](https://www.npmjs.com/package/@augment-vir/common)
 */
export declare enum StringCase {
    Upper = "upper",
    Lower = "lower"
}
/**
 * Options for casing functions in `@augment-vir/common`.
 *
 * @category String
 * @category Package : @augment-vir/common
 * @package [`@augment-vir/common`](https://www.npmjs.com/package/@augment-vir/common)
 */
export type CasingOptions = {
    /**
     * Capitalize the first letter of the string.
     *
     * @default StringCase.Lower
     */
    firstLetterCase: StringCase;
};
/**
 * Default options for {@link CasingOptions}.
 *
 * @category String
 * @category Package : @augment-vir/common
 * @package [`@augment-vir/common`](https://www.npmjs.com/package/@augment-vir/common)
 */
export declare const defaultCasingOptions: Required<CasingOptions>;
/**
 * Convert the first letter of a string to either lower or uppercase.
 *
 * @category String
 * @category Package : @augment-vir/common
 * @package [`@augment-vir/common`](https://www.npmjs.com/package/@augment-vir/common)
 */
export type FirstLetterCase<SpecificCase extends StringCase, Value extends string> = SpecificCase extends StringCase.Lower ? FirstLetterLowercase<Value> : FirstLetterUppercase<Value>;
/**
 * Set the first letter of the input to uppercase or lowercase.
 *
 * @category String
 * @category Package : @augment-vir/common
 * @package [`@augment-vir/common`](https://www.npmjs.com/package/@augment-vir/common)
 */
export declare function setFirstLetterCasing<const SpecificCase extends StringCase, const Value extends string>(input: Value, stringCase: SpecificCase): FirstLetterCase<SpecificCase, Value>;
/**
 * Indicates whether the given string has different lower and upper case variants. (Some strings
 * don't, such as all numbers or `'√'`.)
 *
 * @category String
 * @category Package : @augment-vir/common
 * @package [`@augment-vir/common`](https://www.npmjs.com/package/@augment-vir/common)
 */
export declare function hasCase(input: string): boolean;
/**
 * Options for {@link isCase}.
 *
 * @category String
 * @category Package : @augment-vir/common
 * @package [`@augment-vir/common`](https://www.npmjs.com/package/@augment-vir/common)
 */
export type IsCaseOptions = {
    /**
     * Set to `true` to fail on characters that don't have different upper and lower case versions
     * (such as punctuation, like `'.'` or symbols, like `'√'`).
     *
     * @default false
     */
    rejectNoCaseCharacters: boolean;
};
/**
 * Checks if the given string is exclusively of the specific case.
 *
 * Note that some characters have no casing, such as punctuation (they have no difference between
 * upper and lower casings). By default, those letters always return `true` for this function,
 * regardless of which `caseType` is provided. To instead return `false` for any such characters,
 * pass in an options object and set `rejectNoCaseCharacters` to true.
 *
 * @category String
 * @category Package : @augment-vir/common
 * @package [`@augment-vir/common`](https://www.npmjs.com/package/@augment-vir/common)
 */
export declare function isCase(input: string, caseType: StringCase, options?: PartialWithUndefined<IsCaseOptions>): boolean;