Fastify/5/Make Reply Trailer Async

1.0.0Last update Sep 17, 2024

This codemod updates the reply.trailer method to use an async function for handling trailers, aligning with Fastify v5's support for asynchronous operations in trailers.

Before

fastify.get('/route', (req, reply) => {
  reply.trailer('ETag', function(reply, payload) {
    return 'custom-etag';
  });
  reply.send('');
});

After

fastify.get('/route', (req, reply) => {
  reply.trailer('ETag', async function(reply, payload) {
    return 'custom-etag';
  });
  reply.send('');
});

This codemod updates the reply.trailer method to use an async function for handling trailers, aligning with Fastify v5's support for asynchronous operations in trailers.

Before

fastify.get('/route', (req, reply) => {
  reply.trailer('ETag', function(reply, payload) {
    return 'custom-etag';
  });
  reply.send('');
});

After

fastify.get('/route', (req, reply) => {
  reply.trailer('ETag', async function(reply, payload) {
    return 'custom-etag';
  });
  reply.send('');
});

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