import { EastFunction, Variable } from './functions';
export declare function maxDepth(...depths: number[]): number;
/** Return the maximum depth of the AST. */
/** @internal */
export declare function astDepth(f: EastFunction): number;
/** @internal */
export declare function replaceVariables<T extends EastFunction>(func: T, replacements: Record<string, Variable>): T;
/** @internal */
export declare function replaceVariable<T extends EastFunction>(func: T, old_name: string, new_var: Variable): T;