/** To avoid using lodash in the library, these are simplified versions of a few of lodash's utils. */
/**
 * Breaks a string like 'The_thing91 isBLACK83andWhite a BLACK' to words and composes it as either camelCase ('theThing91391IsBlackAndWhiteABlack') or CamelCase 'TheThing91391IsBlackAndWhiteABlack'.
 * @internal
 * @export
 * @param {string} phrase The phrase to convert to camel case.
 * @param {boolean} upperFirst (Optional) `true` to convert the first letter to uppercase (creating CamelCase); otherwise `false` (creating camelCase). Default is `false`.
 * @returns The camel case representation of the phrase
 */
export declare function camelCase(phrase: string, upperFirst?: boolean): string;