/**
 * Represents a correlation identifier used to track operations across call boundaries.
 */
export declare class CorrelationId {
    readonly value: string;
    /**
     * A well-known {@link CorrelationId} representing an unset/empty value.
     */
    static readonly notSet: CorrelationId;
    /**
     * Creates a new unique {@link CorrelationId}.
     * @returns A new {@link CorrelationId} backed by a freshly generated GUID.
     */
    static create(): CorrelationId;
    /**
     * Initializes a new instance of the {@link CorrelationId} class.
     * @param value - The string value of the correlation identifier.
     */
    constructor(value: string);
    /** @inheritdoc */
    toString(): string;
}
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