import { InjectionToken, ValueProvider } from '@angular/core';
export declare type StringifyTransformer<T = unknown> = (value: T) => string;
export declare const defaultStringifyTransformer: StringifyTransformer<unknown>;
export declare const DEFAULT_STRINGIFY_TRANSFORMER: InjectionToken<StringifyTransformer<unknown>>;
export declare function provideDefaultStringifyTransformer<T = unknown>(transformer: StringifyTransformer<T>): ValueProvider;
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