import { InjectionToken, ValueProvider } from '@angular/core';
export declare type IdentityMatcher<T = unknown> = (a: T, b: T) => boolean;
export declare const defaultIdentityMatcher: IdentityMatcher<unknown>;
export declare const DEFAULT_IDENTITY_MATCHER: InjectionToken<IdentityMatcher<unknown>>;
export declare function provideDefaultIdentityMatcher<T = unknown>(matcher: IdentityMatcher<T>): ValueProvider;
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