import { type HeaderValue } from './header-value.ts';
/**
 * The value of an `If-Range` HTTP header.
 *
 * The `If-Range` header can contain either an entity tag (ETag) or an HTTP date.
 *
 * [MDN `If-Range` Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/If-Range)
 *
 * [HTTP/1.1 Specification](https://datatracker.ietf.org/doc/html/rfc7233#section-3.2)
 */
export declare class IfRange implements HeaderValue {
    value: string;
    constructor(init?: string | Date);
    /**
     * Checks if the `If-Range` condition is satisfied for the current resource state.
     *
     * This method always returns `true` if the `If-Range` header is not present,
     * meaning the range request should proceed unconditionally.
     *
     * The `If-Range` header can contain either:
     * - An HTTP date (RFC 7231 IMF-fixdate format)
     * - An entity tag (ETag)
     *
     * When comparing ETags, only strong entity tags are matched as per RFC 7233.
     * Weak entity tags (prefixed with `W/`) are never considered a match.
     *
     * @param resource The current resource state to compare against
     * @param resource.etag The resource's ETag value
     * @param resource.lastModified The resource's last modified timestamp
     * @returns `true` if the condition is satisfied, `false` otherwise
     *
     * @example
     * ```ts
     * let ifRange = new IfRange('Wed, 21 Oct 2015 07:28:00 GMT')
     * ifRange.matches({ lastModified: 1445412480000 }) // true if dates match
     * ifRange.matches({ lastModified: new Date('2015-10-21T07:28:00Z') }) // true
     *
     * let ifRange2 = new IfRange('"abc123"')
     * ifRange2.matches({ etag: '"abc123"' }) // true
     * ifRange2.matches({ etag: 'W/"abc123"' }) // false (weak ETag)
     * ```
     */
    matches(resource: {
        etag?: string | null;
        lastModified?: number | Date | null;
    }): boolean;
    /**
     * Returns the string representation of the header value.
     *
     * @returns The header value as a string
     */
    toString(): string;
    /**
     * Parse an If-Range header value.
     *
     * @param value The header value (string, Date, or null)
     * @returns An IfRange instance (empty if null)
     */
    static from(value: string | Date | null): IfRange;
}
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