/**
 * Decorates a class to denote that it resembles a service that cannot be instantiated, rather it expects
 * to be mocked by another compatible type. If there was any @ServiceRef of this type and there was no compatible
 * type is mocking it, an exception will be thrown when your code tries to get a service ref of that type.
 * It's typical purpose lies in developing a Circuit library that intended to be published as a separate package.
 * A good example is when a Circuit in a circuit library needs some configuration that must be set through client code.
 * In this case @ServiceContract() means that, this is not a real implemented service, rather the client code must provide
 * its implementation through mocking to enable the full Circuit functionality.
 */
export declare function ServiceContract(): any;
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