import type { FlagView } from '@struktoai/mirage-core/commands/spec/index';
import type { ByteSource } from '@struktoai/mirage-core/io/types';
import type { FetchedMessage } from '../../../../core/email/client.ts';
type SourceMode = 'reply' | 'forward';
export type PostingStyle = 'top' | 'bottom';
/** One file attached to an outgoing message. */
export interface Attachment {
    filename: string;
    contentType: string;
    data: Uint8Array;
}
export interface Compose {
    sender: string;
    to: readonly string[];
    cc: readonly string[];
    bcc: readonly string[];
    subject: string | null;
    body: string;
    signature: string | null;
    attachments?: readonly Attachment[];
}
/**
 * A deterministic multipart boundary for the message's content.
 *
 * A random boundary would break byte-for-byte parity with the python
 * builder and make the no-send stdout non-reproducible. Hashing the
 * content gives a boundary that cannot occur inside it (the content
 * would have to contain its own hash) while staying stable across runs
 * and languages.
 */
export declare function mixedBoundary(body: string, attachments: readonly Attachment[]): string;
export interface Source {
    message: FetchedMessage;
    mode: SourceMode;
    postingStyle: PostingStyle;
    quoteHeadline: string;
}
/** Flattens repeated address flags, splitting comma-separated lists. */
export declare function splitAddresses(values: readonly string[]): string[];
/**
 * Whether a subject already carries a Re:/Fwd: prefix. The colon is part
 * of the comparison: matching on the letters alone would read "Ready to
 * ship" as already prefixed with "Re:".
 */
export declare function hasPrefix(subject: string, prefix: string): boolean;
/** Quotes a source body, one leading '>' per line. */
export declare function quoteText(sourceText: string, headline: string): string;
/** Lays out the user's body, the quoted source and the signature. */
export declare function composeBody(userBody: string, quote: string, signature: string, style: PostingStyle): string;
/**
 * Assembles an RFC 5322 message from flags and an optional source.
 *
 * Hand-built rather than routed through nodemailer's composer: the raw
 * bytes are the command's output when --send is absent, so they must
 * exist before any transport does. Every header and the body ride the
 * mime module's ports of python's serializers, so the output stays
 * byte-identical to EmailMessage.as_bytes(policy=SMTP) - header order,
 * encoded words, folding, transfer encoding and all (pinned in
 * integ/fixtures/himalaya/mime_parity.json).
 */
export declare function build(compose: Compose, source?: Source | null): Uint8Array;
/** Resolves the body from --body, falling back to piped stdin. */
export declare function readBody(fl: FlagView, stdin: ByteSource | null): Promise<string>;
export {};
//# sourceMappingURL=builder.d.ts.map