SnowLuma/.pnpm-store/v11/files/46/ebf4321871570823a79529ce5b5eb9a79c83b2ab966e999b605d4b67cbae7257893f9b04a5e3614e42de9f074a0439dee6d311c2da6974879b3006c8816eb8

//#region src/compose.ts
/**
* Compose middleware functions into a single function based on `koa-compose` package.
*
* @template E - The environment type.
*
* @param {[[Function, unknown], unknown][] | [[Function]][]} middleware - An array of middleware functions and their corresponding parameters.
* @param {ErrorHandler<E>} [onError] - An optional error handler function.
* @param {NotFoundHandler<E>} [onNotFound] - An optional not-found handler function.
*
* @returns {(context: Context, next?: Next) => Promise<Context>} - A composed middleware function.
*/
const compose = (middleware, onError, onNotFound) => {
	return (context, next) => {
		let index = -1;
		return dispatch(0);
		/**
		* Dispatch the middleware functions.
		*
		* @param {number} i - The current index in the middleware array.
		*
		* @returns {Promise<Context>} - A promise that resolves to the context.
		*/
		async function dispatch(i) {
			if (i <= index) throw new Error("next() called multiple times");
			index = i;
			let res;
			let isError = false;
			let handler;
			if (middleware[i]) {
				handler = middleware[i][0][0];
				context.req.routeIndex = i;
			} else handler = i === middleware.length && next || void 0;
			if (handler) try {
				res = await handler(context, () => dispatch(i + 1));
			} catch (err) {
				if (err instanceof Error && onError) {
					context.error = err;
					res = await onError(err, context);
					isError = true;
				} else throw err;
			}
			else if (context.finalized === false && onNotFound) res = await onNotFound(context);
			if (res && (context.finalized === false || isError)) context.res = res;
			return context;
		}
	};
};
//#endregion
export { compose };