/**
 * The body one inbound message flattens into.
 *
 * The text is written in Feishu's own vocabulary: a mention stands as the
 * placeholder the message's `mentions` records name, an image or file stands
 * as its resource key. The channel layer substitutes both when it renders, so
 * nothing here knows how a mention or an attachment is finally written.
 */
export type InboundResourceType = 'file' | 'image';
export interface InboundResource {
    type: InboundResourceType;
    /** Feishu message resource key (`file_key` / `image_key`). */
    key: string;
    /** Original user-facing filename. Treat as display text, never a path. */
    name?: string;
}
export interface ParsedInbound {
    /** The message as text; placeholders and resource keys stand where they were. */
    text: string;
    /** Every resource the text refers to, once each, in first-occurrence order. */
    resources: InboundResource[];
    /** True when the body omits visible content it could not read. */
    incomplete?: boolean;
}
export interface BodyBuilder {
    /** Add one line; an empty string adds nothing. */
    line(text: string): void;
    /** Register a resource once and return the key that stands for it. */
    attach(type: InboundResourceType, key: string, name?: string): string;
    build(incomplete?: boolean): ParsedInbound;
}
export declare function createBody(): BodyBuilder;
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