export type UnaryFunction<RETURN = any, VALUE = any> = (arg: VALUE) => RETURN;
/**
 * Validates a promise and rejects if the predicate returns a false value.
 * @param pred Function to validate the promise with
 */
export declare function safePromise<R>(pred: UnaryFunction<boolean, R>): (arg: R) => Promise<R>;
export declare function safePromise<R>(pred: UnaryFunction<boolean, R>, arg: R): Promise<R>;
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