import { BaseModelLoader, THREE, type ModelLoadContext, type ModelLoadFromBufferContext } from "@x-viewer/core";
export declare const DEFAULT_OCCT_IMPORT_SCRIPT_URL = "https://cdn.jsdelivr.net/npm/occt-import-js@0.0.23/dist/occt-import-js.js";
/** Folder containing `occt-import-js.wasm` (same layout as npm `dist/`). */
export declare const DEFAULT_OCCT_WASM_BASE_URL = "https://cdn.jsdelivr.net/npm/occt-import-js@0.0.23/dist/";
type OcctExchangeImportParams = {
    linearUnit?: "millimeter" | "centimeter" | "meter" | "inch" | "foot";
    linearDeflectionType?: "bounding_box_ratio" | "absolute_value";
    linearDeflection?: number;
    angularDeflection?: number;
};
/**
 * occt-import-js defaults `linearUnit` to millimeter; x-viewer uses meters for scene and measurements.
 * Applies to STEP and IGES readers. BREP ignores `linearUnit` on vertex positions; see `BREP_TO_METERS_SCALE` below.
 */
export declare const DEFAULT_STEP_IMPORT_PARAMS: OcctExchangeImportParams;
export interface StepModelLoaderOptions {
    /** Full URL to `occt-import-js.js`. Default: {@link DEFAULT_OCCT_IMPORT_SCRIPT_URL}. */
    scriptUrl?: string;
    /** Folder URL for wasm (trailing `/` optional). Default: {@link DEFAULT_OCCT_WASM_BASE_URL}. */
    wasmBaseUrl?: string;
}
/**
 * Loads STEP (`.step` / `.stp`), IGES (`.iges` / `.igs`), and BREP (`.brep` / `.rle`) via occt-import-js.
 * BREP geometry is scaled from assumed millimeters to meters so it matches STEP/IGES with `linearUnit: "meter"`.
 */
export declare class StepModelLoader extends BaseModelLoader {
    readonly id = "loader.plugin.step";
    readonly priority = 10;
    readonly formats: readonly ["step", "stp", "iges", "igs", "brep", "rle"];
    private readonly scriptUrl;
    private readonly wasmBaseUrl;
    private readonly importParams;
    constructor(options?: StepModelLoaderOptions);
    load(ctx: ModelLoadContext): Promise<THREE.Object3D>;
    loadFromBuffer(ctx: ModelLoadFromBufferContext): Promise<THREE.Object3D>;
    private parseOcctToResult;
    private reportProgress;
}
export {};