import type { Linter } from 'eslint';
export * from './types';
/**
 * Rename rule keys by a prefix map (longest-prefix-first).
 *
 * Backward compatible: pass a `prefix` string (with optional `from`, default
 * `@typescript-eslint`) to rename a single prefix; or pass a full map.
 */
export declare function renameRules(rules: Record<string, Linter.RuleEntry>, mapOrPrefix: Record<string, string> | string, from?: string): Record<string, Linter.RuleEntry>;
/**
 * Check if a value is a plain object
 */
export declare function isObject(value: unknown): value is Record<string, unknown>;
/**
 * Merge two objects deeply
 */
export declare function deepMerge<T extends Record<string, unknown>>(target: T, source: Partial<T>): T;
/**
 * Ensure a value is an array
 */
export declare function ensureArray<T>(value: T | T[]): T[];
/**
 * Filter out undefined values from an array
 */
export declare function filterNil<T>(array: (T | undefined | null)[]): T[];
/**
 * Check if currently running inside a git hook or lint-staged context.
 * In these contexts we want strict rules (not the editor-downgraded ones).
 */
export declare function isInGitHooksOrLintStaged(): boolean;
/**
 * Check if currently running in an editor environment.
 *
 * Returns `false` in CI and git-hook / lint-staged contexts so that rules
 * downgraded for editors (e.g. `prefer-const`) stay strict where it matters.
 */
export declare function isInEditorEnv(): boolean;
/**
 * Interop default export
 */
export declare function interopDefault<T>(promise: Promise<T>): Promise<T extends {
    default: infer D;
} ? D : T>;
/**
 * Resolve sub-options from parent options
 */
export declare function resolveSubOptions<K extends string>(options: Record<string, unknown>, key: K): Record<string, unknown>;
/**
 * Get overrides from options
 */
export declare function getOverrides(options: Record<string, unknown>, key: string): Linter.RulesRecord;
/**
 * Process ignores option
 */
export declare function processIgnores(userIgnores: string[] | ((defaults: string[]) => string[]) | undefined): string[];
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