/**
 * @octomil/browser — Browser runtime resolver
 *
 * Connects the planner-driven attempt runner to the actual in-browser
 * inference infrastructure (ONNX Runtime Web / Transformers.js).
 *
 * Implements RuntimeChecker and ArtifactChecker for the attempt runner,
 * probing WebGPU/WASM availability and model cache state.
 */
import type { ModelCache } from "../cache.js";
import type { RuntimeChecker, ArtifactChecker, ArtifactCacheStatus, CandidatePlan } from "./attempt-runner.js";
/**
 * Probes the current browser environment for WebGPU and WASM support.
 * Results are cached after first probe since capabilities don't change
 * within a page session.
 */
export declare class BrowserRuntimeChecker implements RuntimeChecker {
    private webgpuResult;
    private wasmResult;
    private engineAvailable;
    checkProvider(provider: "webgpu" | "wasm"): Promise<{
        available: boolean;
        reasonCode?: string;
    }>;
    checkEngineAvailable(engine?: string): Promise<{
        available: boolean;
        reasonCode?: string;
    }>;
    private probeWebGPU;
    private probeWasm;
    private checkWasmSimd;
    private probeEngine;
}
/**
 * Checks model artifact availability using the browser's model cache
 * (Cache API or IndexedDB). Does NOT trigger downloads — only reports
 * current cache state.
 *
 * Downloads are handled separately by the execution layer after routing
 * selects a candidate.
 */
export declare class BrowserArtifactChecker implements ArtifactChecker {
    private static readonly BROWSER_SAFE_FORMATS;
    private readonly cache;
    private readonly serverUrl;
    /** Maximum artifact size to consider downloadable in-browser (default 2GB) */
    private readonly maxSizeBytes;
    constructor(opts: {
        cache: ModelCache;
        serverUrl?: string;
        maxSizeBytes?: number;
    });
    check(artifact: CandidatePlan["artifact"]): Promise<{
        available: boolean;
        cacheStatus: ArtifactCacheStatus;
        reasonCode?: string;
    }>;
    private resolveArtifactFormat;
}
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