export type AttributeValue = {
    S: string;
} | {
    N: string;
} | {
    B: string;
} | {
    SS: string[];
} | {
    NS: string[];
} | {
    BS: string[];
} | {
    M: Record<string, AttributeValue>;
} | {
    L: AttributeValue[];
} | {
    NULL: true;
} | {
    BOOL: boolean;
};
export type MarshalledOutput = Record<string, AttributeValue>;
export declare function marshall(value: unknown): MarshalledOutput;
export declare function toAttributeValue(value: unknown): AttributeValue;
export declare function unmarshall(value: MarshalledOutput): Record<string, unknown>;
export declare function fromAttributeValue(value: AttributeValue): unknown;
export declare function isAttributeValueRecord(value: unknown): value is Record<string, AttributeValue>;
export declare function isAttributeValue(value: unknown): value is AttributeValue;
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