/**
 * Browser bundler implementation using esbuild-wasm.
 *
 * This module handles WASM initialization and provides a bundler that
 * works entirely in the browser.
 */
import type { IBundler, BundleOptions, BundleResult } from "../types";
export interface EsbuildWasmBundlerOptions {
    /**
     * URL to the esbuild WASM file.
     * @default "https://unpkg.com/esbuild-wasm@{version}/esbuild.wasm"
     */
    wasmUrl?: string;
    /**
     * URL to load esbuild-wasm module from.
     * @default "https://esm.sh/esbuild-wasm@{version}"
     */
    esbuildUrl?: string;
    /**
     * Base URL for CDN imports.
     * npm imports like "lodash" are rewritten to "{cdnBaseUrl}/lodash@{version}".
     * @default "https://esm.sh"
     */
    cdnBaseUrl?: string;
    /**
     * ECMAScript target for esm.sh CDN imports.
     *
     * This sets the `?target=` query parameter on esm.sh URLs to ensure
     * consistent output. Without this, esm.sh uses User-Agent detection
     * which can vary between environments.
     *
     * @example "es2020"
     * @example "es2022"
     * @default "es2020"
     */
    esmTarget?: string;
    /**
     * Whether to initialize immediately on construction.
     * If false, initialization happens lazily on first bundle() call.
     * @default false
     */
    eagerInit?: boolean;
}
/**
 * Browser bundler implementation using esbuild-wasm.
 *
 * Handles WASM initialization internally. The first bundle() call
 * will wait for initialization if not already complete.
 *
 * @example
 * ```ts
 * const bundler = new EsbuildWasmBundler();
 * await bundler.initialize();
 *
 * const result = await bundler.bundle({
 *   fs: myFilesystem,
 *   entryPoint: "/src/index.ts",
 * });
 * ```
 */
export declare class EsbuildWasmBundler implements IBundler {
    private options;
    constructor(options?: EsbuildWasmBundlerOptions);
    /**
     * Initialize the esbuild WASM module.
     * Called automatically on first bundle() if not already initialized.
     *
     * Uses a global singleton pattern since esbuild-wasm can only be
     * initialized once per page.
     */
    initialize(): Promise<void>;
    private doInitialize;
    /**
     * Get the initialized esbuild instance.
     */
    private getEsbuild;
    /**
     * Dispose of the esbuild WASM service.
     * This stops the esbuild service and allows the process to exit.
     *
     * Note: Since esbuild-wasm uses a global singleton, this affects all
     * instances. After dispose(), you'll need to create a new bundler.
     */
    dispose(): Promise<void>;
    private checkCrossOriginIsolation;
    bundle(options: BundleOptions): Promise<BundleResult>;
}
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