/**
 * A minimal protobuf wire-format codec, just enough for Depot's build-step RPCs.
 *
 * Why this exists: Depot's Connect JSON binding of `depot.build.v1.BuildService/GetBuildSteps`
 * is broken server-side (observed 2026-09-06: the server fails to encode its own response,
 * "cannot encode field ... has_logs to JSON: expected boolean, got 0"), while the same RPC over
 * the binary protobuf encoding works. The messages involved are tiny (strings, int32, bool, an
 * enum, and google.protobuf.Timestamp), so a dependency-free codec is smaller and safer than
 * pulling in a protobuf runtime plus generated code.
 *
 * Only the wire types that appear in those messages are supported: varint (0), 64-bit (1),
 * length-delimited (2) and 32-bit (5). Groups (3, 4) are rejected.
 */
export interface VarintField {
    readonly wire: 0;
    readonly value: bigint;
}
export interface BytesField {
    readonly wire: 1 | 2 | 5;
    readonly value: Uint8Array;
}
export type WireField = VarintField | BytesField;
/** A decoded message: field number -> every occurrence, in wire order. */
export type DecodedMessage = ReadonlyMap<number, readonly WireField[]>;
export declare class ProtobufDecodeError extends Error {
    constructor(message: string);
}
export declare function decodeMessage(bytes: Uint8Array): DecodedMessage;
/** proto3 "last one wins" for scalars. */
export declare function fieldString(message: DecodedMessage, field: number): string | undefined;
export declare function fieldBool(message: DecodedMessage, field: number): boolean | undefined;
/** Varint read as a signed 64-bit integer, then narrowed to a JS number. */
export declare function fieldInt(message: DecodedMessage, field: number): number | undefined;
export declare function fieldMessages(message: DecodedMessage, field: number): DecodedMessage[];
export declare function fieldMessage(message: DecodedMessage, field: number): DecodedMessage | undefined;
/** google.protobuf.Timestamp { int64 seconds = 1; int32 nanos = 2; } as an RFC 3339 string. */
export declare function fieldTimestamp(message: DecodedMessage, field: number): string | undefined;
/** Builds a message from scalar fields and nested messages; unset (undefined) values are omitted. */
export declare class ProtobufWriter {
    private readonly parts;
    private varint;
    private tag;
    private lengthDelimited;
    string(field: number, value: string | undefined): this;
    int32(field: number, value: number | undefined): this;
    bool(field: number, value: boolean | undefined): this;
    message(field: number, value: ProtobufWriter | undefined): this;
    finish(): Uint8Array;
}
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