/** Canonical mesh binary wire facts shared by build-time and runtime owners. */
export declare const MESH_BIN_VERSION: 5;
export declare const MESH_BIN_PROJECTION_VERSION: 1;
export declare const MESH_BIN_HEADER_BYTES = 80;
export declare const MESH_BIN_DIGEST_BYTES = 32;
export interface MeshBinHeader {
    readonly version: 4 | 5;
    readonly projectionVersion: 1;
    readonly mask: number;
    readonly digest: string;
    readonly stride: number;
    readonly vertexCount: number;
    readonly vertexBytes: number;
    readonly indexCount: number;
    readonly indexWidth: 0 | 2 | 4;
    readonly indexBytes: number;
    readonly jsonBytes: number;
    readonly morphBytes: number;
}
export interface MeshBinContractError {
    readonly code: 'mesh-bin-header-truncated' | 'mesh-bin-version-unsupported' | 'mesh-bin-header-invalid';
    readonly subject: 'mesh-bin';
    readonly sourceKey: string;
    readonly expected: string;
    readonly actual: string;
    readonly recovery: string;
}
export type MeshBinHeaderResult = {
    readonly ok: true;
    readonly value: MeshBinHeader;
} | {
    readonly ok: false;
    readonly error: MeshBinContractError;
};
export declare function writeMeshBinHeader(header: MeshBinHeader, out: Uint8Array): void;
export declare function decodeMeshBinHeader(bytes: Uint8Array, sourceKey?: string): MeshBinHeaderResult;
/** Low bits declare channels; corresponding bits shifted by three elide all-positive-zero lanes. */
export declare const MESH_BIN_MORPH_CHANNELS: readonly [{
    readonly key: "position";
    readonly mask: 1;
    readonly components: 3;
}, {
    readonly key: "normal";
    readonly mask: 2;
    readonly components: 3;
}, {
    readonly key: "tangent";
    readonly mask: 4;
    readonly components: 4;
}];
/** Decode v5 morph lanes into private arrays; both mesh readers use this wire contract. */
export declare function decodeMeshBinMorphs(bytes: Uint8Array, vertexCount: number, masks: unknown): ReadonlyArray<Record<string, Float32Array>> | undefined;
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