import { ReferenceType } from "../../types";
/**
 * Determines the equality of 2 reference type values.
 * @param x one value.
 * @param y the other value.
 * @returns
 * `true` if one of the following conditions is satisfied
 * * `Object.is(x, y)` is `true` (this also implies `x === y`).
 * * Both `x` and `y` has implemented {@link Equatable} interface, and `x[EqualsSymbol](y)` returns `true`.
 *     * If `y[EqualsSymbol](x)` returns `false` in the meantime, the behavior is undefined.
 */
export declare function referenceTypeEquals(x: ReferenceType | null | undefined, y: ReferenceType | null | undefined): boolean;
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