/**
 * export/protobuf.ts — a minimal, dependency-free protobuf (proto3) wire writer.
 *
 * Just enough of the encoding to emit an ONNX `ModelProto` (see {@link ./onnx}):
 * varint, fixed32 (for float tensors), and length-delimited (string / bytes /
 * nested message) fields. Keeping it tiny and self-contained preserves the
 * engine's zero-runtime-dependency guarantee — no `protobufjs`, no `onnx` proto.
 *
 * Only non-negative integers are emitted (all ONNX ids here are ≥ 0), so the
 * varint path uses plain division and stays correct up to 2^53.
 */
/** Accumulates protobuf-encoded bytes for one message. */
export declare class ProtoWriter {
    private readonly parts;
    private byte;
    private rawVarint;
    private tag;
    private rawBytes;
    /** A varint field (int32 / int64 / bool / enum). */
    varint(field: number, value: number): void;
    /** A 32-bit IEEE-754 float field (wire type fixed32, little-endian). */
    float(field: number, value: number): void;
    /** A length-delimited raw-bytes field. */
    bytes(field: number, data: Uint8Array): void;
    /** A length-delimited UTF-8 string field. */
    string(field: number, value: string): void;
    /** A nested-message field (the sub-message encoded as length-delimited bytes). */
    message(field: number, sub: ProtoWriter): void;
    /** The encoded bytes of this message. */
    finish(): Uint8Array;
}
/** Pack a Float32Array into little-endian raw bytes (for TensorProto.raw_data). */
export declare function float32ToBytes(data: Float32Array): Uint8Array;
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