/**
 * Dynamically import an optional dependency, converting a missing package into
 * an actionable error.
 *
 * NeuroLink declares 42 `optionalDependencies`, and each loader had grown its
 * own copy of the same try/catch: check `err.code`, substring-match the package
 * name, rethrow a friendlier Error. The copies had drifted — some said
 * `pnpm add`, one said `npm install`, and the phrasing varied per call site.
 *
 * Only missing-module failures are intercepted. A package that is installed but
 * throws while evaluating (syntax error, ESM/CJS interop, a broken transitive
 * dep) rethrows unchanged — turning those into "please install X" would send
 * the caller after a package they already have. The same applies to specifiers
 * that are not installable packages at all (relative paths, file/data URLs):
 * they rethrow untouched rather than producing an unrunnable install command.
 *
 * @param pkg - Module specifier. The install hint is only produced for bare
 *   package names; anything else rethrows the loader's own error.
 * @param feature - Human-readable capability name, used to open the message.
 * @returns The imported module namespace, typed as `T` (`unknown` if the
 *   caller does not supply a type argument, since the shape cannot be known
 *   for a dynamic specifier).
 * @throws The loader's original error, or an `Error` naming the package and
 *   the `pnpm add` command when a bare package is genuinely absent. The
 *   original failure is always preserved on `cause`.
 *
 * @example
 * ```ts
 * const ExcelJS = await tryImport<typeof import("exceljs")>(
 *   "exceljs",
 *   "Excel file processing",
 * );
 * ```
 */
export declare function tryImport<T = unknown>(pkg: string, feature: string): Promise<T>;