import type { ModuleFormat } from 'rollup';
export interface GetBundledFileExtensionOptions {
    format: ModuleFormat;
    /**
     * @defaultValue 'commonjs'
     */
    packageType?: 'module' | 'commonjs' | undefined;
}
export type JsExtensionStubs = 'js' | 'cjs' | 'mjs' | `${string}.js`;
export type JsExtensions = `.${JsExtensionStubs}`;
/**
 * Default rollup behavior.
 *
 */
export declare const getBundledFileExtension: (options: GetBundledFileExtensionOptions) => JsExtensions;
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