/**
 * A wrapper error type that represents a non-standard error thrown from a
 * response, such as a symbol or plain object. Read the `cause` property to
 * determine the source of the error.
 */
export declare class UnconventionalError extends Error {
    /** Determine if an error is an `UnconventionalError` instance */
    static is(error: unknown): error is UnconventionalError;
    constructor(errorType: unknown);
}
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