/** Package-private primitives for validating mapped rows before any write lock. */
export declare function isNonEmptyString(value: unknown): value is string;
export declare function isOptionalString(value: unknown): value is string | undefined;
export declare function isOptionalNonEmptyString(value: unknown): value is string | undefined;
export declare function isFiniteNonNegativeNumber(value: unknown): value is number;
export declare function isNonNegativeInteger(value: unknown): value is number;
export declare function isJsonSerializable(value: unknown): boolean;
export declare function isPlainJsonRecord(value: unknown): value is Record<string, unknown>;
export declare function isStringRecord(value: unknown): value is Readonly<Record<string, string>>;
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