/**
 * Inline file bytes reached a SQL write with no durable URL to stand in for
 * them. Raised only by the `reject` policy; a durable dispatch payload must
 * carry a reference the worker can re-read, never a placeholder.
 */
export declare class DurableAttachmentReferenceRequiredError extends Error {
    readonly code = "attachment_storage_required";
    constructor();
}
/**
 * `reject` throws when an attachment has bytes but no durable URL;
 * `placeholder` keeps a visible `{ type: "file", name, mediaType, omitted:
 * "inline-bytes" }` stub, for snapshots saved before the upload returned a URL.
 */
export type InlineBytesPolicy = "reject" | "placeholder";
/**
 * The one boundary every chat SQL write passes through (thread snapshots, run
 * events, durable dispatch payloads): inline image/file bytes become their
 * durable URL when the part carries one, and otherwise follow `policy`. Data
 * URLs embedded in any other string become a visible `[inline … omitted]`.
 */
export declare function stripInlineBytes<T>(value: T, policy: InlineBytesPolicy): T;
/** `stripInlineBytes` for serialized JSON; skips the parse when no body can be present. */
export declare function stripInlineBytesFromJson(json: string, policy: InlineBytesPolicy): string;
/**
 * Throws with the JSON path of the first inline file body in `value` (an
 * object, or a JSON string as read back from a SQL column).
 */
export declare function assertNoInlineImageBytes(value: unknown, label?: string): void;