/**
 * Calls toString() twice, in case value is an object, where user provides a toString() method.
 * The first call to toString() returns back something other than a string (eg a number to render)
 * @internal AG_GRID_INTERNAL - Not for public use. Can change / be removed at any time.
 */
export declare function _toString(toEscape?: string | null): string | null;
/** @internal AG_GRID_INTERNAL - Not for public use. Can change / be removed at any time. */
export declare function _escapeString(toEscape?: string | null): string | null;
/** @internal AG_GRID_INTERNAL - Not for public use. Can change / be removed at any time. */
export declare function _isExpressionString(value: unknown): value is `=${string}`;
/**
 * Converts a camelCase string into startCase
 * @param {string} camelCase
 * @returns {string}
 * @internal AG_GRID_INTERNAL - Not for public use. Can change / be removed at any time.
 */
export declare function _camelCaseToHumanText(camelCase: string | undefined): string | null;