/**
 * Defensive line-by-line parser for `docker buildx build --progress=rawjson` stdout.
 *
 * Line contract: the caller is responsible for buffering subprocess stdout
 * chunks into newline-delimited lines. This function consumes exactly one
 * complete line per call and never returns partial parses.
 *
 * `RawjsonEnvelope` is a TS-typed structural shape, NOT a Zod schema.
 * Buildx is the upstream producer and ships new fields between minor
 * versions; a `.strict()` schema would reject valid output the moment
 * a buildx upgrade lands. The external-API exemption from typescript-
 * standards Pitfall 3 applies. Unknown keys are preserved on the
 * `extra` record so downstream consumers and diagnostics can still see
 * what was sent.
 *
 * Returns `null` only when the line is not parseable as JSON, or is a
 * JSON value other than a non-array object (e.g. a top-level string,
 * number, or array — none of which are valid rawjson envelopes).
 */
export interface RawjsonVertex {
    readonly digest?: string;
    readonly name?: string;
    readonly started?: string;
    readonly completed?: string;
    readonly cached?: boolean;
    readonly error?: string;
    readonly inputs?: readonly string[];
}
export interface RawjsonStatus {
    readonly id?: string;
    readonly vertex?: string;
    readonly name?: string;
    readonly current?: number;
    readonly total?: number;
    readonly started?: string;
    readonly completed?: string;
}
export interface RawjsonLog {
    readonly vertex?: string;
    readonly stream?: number;
    readonly data?: string;
    readonly timestamp?: string;
}
export interface RawjsonWarning {
    readonly vertex?: string;
    readonly level?: string;
    readonly short?: string;
}
export interface RawjsonEnvelope {
    readonly vertexes?: readonly RawjsonVertex[];
    readonly statuses?: readonly RawjsonStatus[];
    readonly logs?: readonly RawjsonLog[];
    readonly warnings?: readonly RawjsonWarning[];
    readonly extra: Readonly<Record<string, unknown>>;
}
export declare function parseRawjsonLine(line: string): RawjsonEnvelope | null;