/**
 * @since 1.0.0
 */
import * as equivalence from "@effect/data/Equivalence";
/**
 * Tests if a value is a `symbol`.
 *
 * @param input - The value to test.
 *
 * @example
 * import { isSymbol } from "@effect/data/Predicate"
 *
 * assert.deepStrictEqual(isSymbol(Symbol.for("a")), true)
 * assert.deepStrictEqual(isSymbol("a"), false)
 *
 * @category guards
 * @since 1.0.0
 */
export declare const isSymbol: (u: unknown) => u is symbol;
/**
 * @category instances
 * @since 1.0.0
 */
export declare const Equivalence: equivalence.Equivalence<symbol>;
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