/**
 * Object that can be compared for equality.
 */
export interface Equatable {
    /**
     * Compares this object to another for equality.
     */
    equals(other: this): boolean;
}
/**
 * Compares two nullable objects for equality.
 */
export declare function isEqual<T extends Equatable>(a: T | null | undefined, b: T | null | undefined): boolean;
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