import * as Schema from 'effect/Schema';
declare const ForeignKey_: Schema.Struct<{
    /**
     * Name of the foreign database/system.
     * E.g., `github.com`.
     */
    source: typeof Schema.String;
    /**
     * Id within the foreign database.
     */
    id: Schema.SchemaClass<string, string, never>;
}>;
export type ForeignKey = Schema.Schema.Type<typeof ForeignKey_>;
/**
 * Reference to an object in a foreign database.
 */
export declare const ForeignKey: Schema.Schema<ForeignKey>;
export {};
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