/**
 * Closed mime allowlist for v0.1.x media uploads. Adapter authors
 * cannot extend this without a grammar-revise round.
 *
 * SVG is intentionally absent from the always-on set — object stores
 * don't sanitize and a passthrough SVG can carry inline scripts. SVG
 * uploads are only accepted when the adapter wires the use case with
 * `allowSvg: true`, typically from a `MEDIA_ALLOW_SVG=1` env opt-in.
 */
export declare const MEDIA_MIME_ALLOWLIST: readonly ["image/png", "image/jpeg", "image/webp", "image/avif", "image/gif"];
export declare const MEDIA_SVG_MIME: "image/svg+xml";
export type MediaMimeType = (typeof MEDIA_MIME_ALLOWLIST)[number] | typeof MEDIA_SVG_MIME;
export declare function isAllowedMime(mime: string, allowSvg: boolean): boolean;
/** Upload-capability TTL: 15 minutes. Bearer URL is short-lived. */
export declare const UPLOAD_URL_TTL_SECONDS: number;
/** Map a mime type to a conventional file extension for object key
 *  construction. Extension is purely cosmetic in R2 — server-side
 *  serving never infers content-type from the key. */
export declare function extensionForMime(mime: string): string;
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