/**
 * HTTP method utilities shared across the ev runtime.
 */
/** Supported HTTP methods for route handlers. */
export declare const HTTP_METHODS: readonly ["GET", "POST", "PUT", "PATCH", "DELETE", "HEAD", "OPTIONS"];
export declare const HTTP_METHOD_LIST_DESCRIPTION: string;
export declare const APPLICATION_JSON_CONTENT_TYPE = "application/json";
export declare const TEXT_HTML_CONTENT_TYPE = "text/html";
export declare const TEXT_PLAIN_CONTENT_TYPE = "text/plain";
export declare const RSC_FLIGHT_CONTENT_TYPE = "text/x-component";
export declare const TEXT_HTML_UTF8_CONTENT_TYPE = "text/html; charset=utf-8";
export declare const TEXT_PLAIN_UTF8_CONTENT_TYPE = "text/plain; charset=utf-8";
/** Union type of supported HTTP methods. */
export type HttpMethod = (typeof HTTP_METHODS)[number];
/** Type guard: returns true if value is an integer HTTP error status. */
export declare function isHttpErrorStatus(value: unknown): value is number;
/** Type guard: returns true if value is an HTTP status that can include a body. */
export declare function isHttpBodyStatus(value: unknown): value is number;
/** Type guard: returns true if value can be passed to the Headers constructor. */
export declare function isHeadersInit(value: unknown): boolean;
/** Type guard: returns true if value is the application/json media type. */
export declare function isApplicationJsonContentType(value: unknown): value is string;
/** Format a Content-Type header value for diagnostics. */
export declare function formatContentTypeHeaderValue(value: string | null): string;
/** Type guard: returns true if value is the text/html media type. */
export declare function isTextHtmlContentType(value: unknown): value is string;
/** Type guard: returns true if value is the React Flight media type. */
export declare function isRscFlightContentType(value: unknown): value is string;
/** Type guard: returns true if value is a valid uppercase HTTP method. */
export declare function isHttpMethod(value: string): value is HttpMethod;
/**
 * Normalize a string to a valid HttpMethod.
 * Returns undefined if the value is not a recognized HTTP method.
 */
export declare function toHttpMethod(value: string): HttpMethod | undefined;
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