cascade.js

function createCascade() {
  const middleware = [];

  async function run(ctx, next = () => {}) {
    // Reverse list to .pop() instead of .shift() for performance
    const handlers = [...middleware, next].reverse();

    async function runNext() {
      if (handlers.length) {
        const handler = handlers.pop();

        await handler(ctx, runNext);
      }
    }

    await runNext();

    return ctx;
  }

  run.use = (handler) => {
    middleware.push(handler);

    return run;
  };

  return run;
}