/**
 * Helper to mock and restore Node `process.platform` during tests.
 *
 * Provides simple methods to set and reset the platform value for unit tests.
 */
declare class ProcessHelper {
    /** Cache of the original `process.platform` value. */
    cachedPlatform: string;
    /** Cache of the original `global.navigator` value. */
    cachedNavigator: any;
    /**
     * Create a new ProcessHelper and capture the current platform.
     *
     * @example
     * const p = new ProcessHelper();
     */
    constructor();
    /**
     * Reset `process.platform` to the originally cached value.
     *
     * @example
     * const p = new ProcessHelper();
     * p.setPlatform('win32');
     * p.resetPlatform(); // restores original platform
     */
    resetPlatform(): void;
    /**
     * Set `process.platform` to a provided value for the duration of a test.
     * Passing no argument will set the platform to `undefined`, allowing
     * tests to simulate a missing/unknown platform.
     *
     * @param {string | undefined} [platform] - The platform string to apply (e.g. 'win32') or `undefined`.
     *
     * @example
     * const p = new ProcessHelper();
     * p.setPlatform('darwin');
     * p.setPlatform(); // sets platform to undefined
     */
    setPlatform(platform?: string): void;
    /**
     * Set the global `navigator` object for the duration of a test.
     * Passing no argument sets `navigator` to `undefined`.
     *
     * @param {unknown} [obj] - The object to set as `global.navigator` or `undefined`.
     */
    setNavigator(obj?: unknown): void;
    /**
     * Restore the original `navigator` value cached at construction.
     */
    resetNavigator(): void;
}
export default ProcessHelper;