export declare function expectString(value: unknown, fieldName: string, messageType: string): string;
export declare function expectCurrentEmotion(value: unknown, fieldName: string, messageType: string): string;
export declare function optionalString(value: unknown): string | undefined;
export declare function optionalContentString(value: unknown): string | undefined;
export declare function optionalNumber(value: unknown): number | undefined;
export declare function expectLocalAgentRef(value: unknown, fieldName: string, messageType: string): string;
export declare function expectLocalAgentIdentity(localAgentRefValue: unknown, ownerUserIdValue: unknown, realmAgentIdValue: unknown, messageType: string): {
    localAgentRef: string;
    ownerUserId: string;
    realmAgentId: string;
};
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