import type { CompiledFunctions, Dictionary, EntityData, EntityDictionary, EntityKey, EntityMetadata, EntityName, EntityProperty, Primary } from '../typings.js';
import type { Platform } from '../platforms/Platform.js';
import { ScalarReference } from '../entity/Reference.js';
import { Collection } from '../entity/Collection.js';
import { type RawQueryFragmentSymbol } from './RawQueryFragment.js';
/** Deeply compares two objects for equality, handling dates, regexes, and raw fragments. */
export declare function compareObjects(a: any, b: any): boolean;
/** Compares two arrays element-by-element for deep equality. */
export declare function compareArrays(a: any[] | string, b: any[] | string): boolean;
/** Compares two boolean values, treating numeric 0/1 as false/true. */
export declare function compareBooleans(a: unknown, b: unknown): boolean;
/** Compares two byte arrays element-by-element. */
export declare function compareBuffers(a: Uint8Array, b: Uint8Array): boolean;
/**
 * Checks if arguments are deeply (but not strictly) equal.
 */
export declare function equals(a: any, b: any): boolean;
/** Parses a JSON string safely, returning the original value if parsing fails. */
export declare function parseJsonSafe<T = unknown>(value: unknown): T;
/** Collection of general-purpose utility methods used throughout the ORM. */
export declare class Utils {
    #private;
    static readonly PK_SEPARATOR = "~~~";
    /**
     * Checks if the argument is instance of `Object`. Returns false for arrays.
     */
    static isObject<T = Dictionary>(o: any): o is T;
    /**
     * Removes `undefined` properties (recursively) so they are not saved as nulls
     */
    static dropUndefinedProperties(o: any, value?: null, visited?: Set<unknown>): void;
    /**
     * Returns the number of properties on `obj`. This is 20x faster than Object.keys(obj).length.
     * @see https://github.com/deepkit/deepkit-framework/blob/master/packages/core/src/core.ts
     */
    static getObjectKeysSize(object: Dictionary): number;
    /**
     * Returns true if `obj` has at least one property. This is 20x faster than Object.keys(obj).length.
     * @see https://github.com/deepkit/deepkit-framework/blob/master/packages/core/src/core.ts
     */
    static hasObjectKeys(object: Dictionary): boolean;
    /**
     * Checks if arguments are deeply (but not strictly) equal.
     */
    static equals(a: any, b: any): boolean;
    /**
     * Gets array without duplicates.
     */
    static unique<T = string>(items: T[]): T[];
    /**
     * Merges all sources into the target recursively.
     */
    static merge(target: any, ...sources: any[]): any;
    /**
     * Merges all sources into the target recursively. Ignores `undefined` values.
     */
    static mergeConfig<T>(target: T, ...sources: Dictionary[]): T;
    /**
     * Merges all sources into the target recursively.
     */
    private static _merge;
    /**
     * Creates deep copy of given object.
     */
    static copy<T>(entity: T, respectCustomCloneMethod?: boolean): T;
    /**
     * Normalize the argument to always be an array.
     */
    static asArray<T>(data?: T | readonly T[] | Iterable<T>, strict?: boolean): T[];
    /**
     * Checks if the value is iterable, but considers strings and buffers as not iterable.
     */
    static isIterable<T>(value: unknown): value is Iterable<T>;
    /**
     * Renames object key, keeps order of properties.
     */
    static renameKey<T>(payload: T, from: string | keyof T, to: string): void;
    /**
     * Returns array of functions argument names. Uses basic regex for source code analysis, might not work with advanced syntax.
     */
    static getConstructorParams(func: {
        toString(): string;
    }): string[] | undefined;
    /**
     * Checks whether the argument looks like primary key (string, number or ObjectId).
     */
    static isPrimaryKey<T>(key: any, allowComposite?: boolean): key is Primary<T>;
    /**
     * Extracts primary key from `data`. Accepts objects or primary keys directly.
     */
    static extractPK<T extends object>(data: any, meta?: EntityMetadata<T>, strict?: boolean): Primary<T> | string | null;
    static getCompositeKeyValue<T>(data: EntityData<T>, meta: EntityMetadata<T>, convertCustomTypes?: boolean | 'convertToDatabaseValue' | 'convertToJSValue', platform?: Platform): Primary<T>;
    static getCompositeKeyHash<T>(data: EntityData<T>, meta: EntityMetadata<T>, convertCustomTypes?: boolean, platform?: Platform, flat?: boolean): string;
    static getPrimaryKeyHash(pks: (string | Buffer | Date)[]): string;
    static splitPrimaryKeys<T extends object>(key: string): EntityKey<T>[];
    static getPrimaryKeyValues<T>(entity: T, meta: EntityMetadata<T>, allowScalar?: boolean, convertCustomTypes?: boolean): any;
    static getPrimaryKeyCond<T>(entity: T, primaryKeys: EntityKey<T>[]): Record<string, Primary<T>> | null;
    /**
     * Maps nested FKs from `[1, 2, 3]` to `[1, [2, 3]]`.
     */
    static mapFlatCompositePrimaryKey(fk: Primary<any>[], prop: EntityProperty, fieldNames?: string[], idx?: number): Primary<any> | Primary<any>[];
    static getPrimaryKeyCondFromArray<T extends object>(pks: Primary<T>[], meta: EntityMetadata<T>): Record<string, Primary<T>>;
    static getOrderedPrimaryKeys<T>(id: Primary<T> | Record<string, Primary<T>>, meta: EntityMetadata<T>, platform?: Platform, convertCustomTypes?: boolean, allowScalar?: boolean): Primary<T>[];
    /**
     * Checks whether given object is an entity instance.
     */
    static isEntity<T = unknown>(data: any, allowReference?: boolean): data is T & {};
    /**
     * Checks whether given object is a scalar reference.
     */
    static isScalarReference<T = unknown>(data: any): data is ScalarReference<any> & {};
    /**
     * Checks whether the argument is empty (array without items, object without keys or falsy value).
     */
    static isEmpty(data: any): boolean;
    /**
     * Gets string name of given class.
     */
    static className<T>(classOrName: string | EntityName<T>): string;
    static extractChildElements(items: string[], prefix: string, allSymbol?: string): string[];
    /**
     * Tries to detect TypeScript support.
     */
    static detectTypeScriptSupport(): boolean;
    /**
     * Gets the type of the argument.
     */
    static getObjectType(value: any): string;
    /**
     * Checks whether the value is POJO (e.g. `{ foo: 'bar' }`, and not instance of `Foo`)
     */
    static isPlainObject<T extends Dictionary>(value: any): value is T;
    /**
     * Executes the `cb` promise serially on every element of the `items` array and returns array of resolved values.
     */
    static runSerial<T = any, U = any>(items: Iterable<U>, cb: (item: U) => Promise<T>): Promise<T[]>;
    static isCollection<T extends object, O extends object = object>(item: any): item is Collection<T, O>;
    static hash(data: string, length?: number): string;
    static runIfNotEmpty(clause: () => any, data: any): void;
    static defaultValue<T extends Dictionary>(prop: T, option: keyof T, defaultValue: any): void;
    static findDuplicates<T>(items: T[]): T[];
    static removeDuplicates<T>(items: T[]): T[];
    static randomInt(min: number, max: number): number;
    /**
     * Extracts all possible values of a TS enum. Works with both string and numeric enums.
     */
    static extractEnumValues(target: Dictionary): (string | number)[];
    static flatten<T>(arrays: T[][], deep?: boolean): T[];
    static isOperator(key: PropertyKey, includeGroupOperators?: boolean): boolean;
    static hasNestedKey(object: unknown, key: string): boolean;
    static getORMVersion(): string;
    static createFunction(context: Map<string, any>, code: string, compiledFunctions?: CompiledFunctions, key?: string): any;
    static callCompiledFunction<T extends unknown[], R>(fn: (...args: T) => R, ...args: T): R;
    static unwrapProperty<T>(entity: T, meta: EntityMetadata<T>, prop: EntityProperty<T>, payload?: boolean): [unknown, number[]][];
    static setPayloadProperty<T>(entity: EntityDictionary<T>, meta: EntityMetadata<T>, prop: EntityProperty<T>, value: unknown, idx: number[]): void;
    static tryImport<T extends Dictionary = any>({ module, warning, }: {
        module: string;
        warning?: string;
    }): Promise<T | undefined>;
    static xor(a: boolean, b: boolean): boolean;
    static keys<T extends object>(obj: T): (keyof T)[];
    static values<T extends object>(obj: T): T[keyof T][];
    static entries<T extends object>(obj: T): [keyof T, T[keyof T]][];
    static primaryKeyToObject<T>(meta: EntityMetadata<T>, primaryKey: Primary<T> | T, visible?: (keyof T)[]): T;
    static getObjectQueryKeys<T extends Dictionary, K extends string = Extract<keyof T, string>>(obj: T): (K | RawQueryFragmentSymbol)[];
}