Custom middleware (insertAfter 'shape')

Add a header after the response is shaped:

import { insertAfter } from '@karmaniverous/smoz';

const addHeader = {
  after: (req: unknown) => {
    const r = req as { response?: { headers?: Record<string, string> } };
    if (!r.response) return;
    r.response.headers = {
      ...(r.response.headers ?? {}),
      'X-Transform': 'yes',
    };
  },
};

export const fn = app.defineFunction({
  eventType: 'rest',
  method: 'get',
  basePath: 'hello',
  httpContexts: ['public'],
  http: {
    transform: ({ before, after, onError }) => ({
      before,
      after: insertAfter(after, 'shape', addHeader as never),
      onError,
    }),
  },
  // ...
});
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See the Middleware page for invariants and other transform helpers.