import { Scalar } from 'yaml';
/**
 * `!function` A YAML representation of JavaScript functions
 *
 * Stringified as a block literal string, prefixed with the function name.
 *
 * When parsing, a no-op function with matching name and toString() is
 * returned. It is not possible to construct an actual JavaScript function by
 * evaluating YAML, and it is unsafe to attempt.
 */
export declare const functionTag: {
    identify: (value: unknown) => value is Function;
    tag: string;
    resolve(str: string): {
        (): void;
        toString(): string;
    };
    options: {
        defaultType: Scalar.Type;
    };
    stringify(i: Scalar<unknown>, ctx: import("yaml/util").StringifyContext, onComment: (() => void) | undefined, onChompKeep: (() => void) | undefined): string;
};