/**
 * An error that occurred during the execution of an app capability.
 */
export declare class ExecutionError extends Error {
    readonly cause: unknown;
    constructor(cause: unknown);
}
/** Explicitly permit another workflow or step attempt. */
export declare class RetryableError extends Error {
    readonly retryAfterMs: number | undefined;
    constructor(message: string, options?: {
        retryAfterMs?: number;
    });
}
/** Skip remaining workflow or step attempts. */
export declare class FatalError extends Error {
    constructor(message: string);
}
/** Tell the platform that an external service asked the sync to slow down. */
export declare class RateLimitError extends ExecutionError {
    readonly retryAfter: number | undefined;
    constructor(options?: {
        retryAfter?: number;
    });
}
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