jldec/demo-fastify-esm

demo-fastify-esm

Minimal fastify server to demonstrate async module loading using dynamic import.

The shortscale module was originally published using CommonJS for v1. Since v2, the module is available only as an ESM module. This means that it can no longer be loaded using Node.js require().

The server.js code below loads both CJS and the ESM versions. Aliases for each are declared in package.json.

// minimal fastify server based on:
// https://www.fastify.io/docs/latest/Getting-Started/#your-first-server

const fastify = require('fastify')({ logger: true });

fastify.register(async (fastify) => {
  let shortscale_v1 = require('shortscale-v1');
  let shortscale_v4 = (await import('shortscale-v4')).default;

  // e.g. http://localhost:3000/shortscale-v1?n=47
  fastify.get('/shortscale-v1', function (req, res) {
    let num = Number(req.query.n);
    let str = '' + shortscale_v1(num);
    res.send({num, str});
  });

  // e.g. http://localhost:3000/shortscale-v4?n=47
  fastify.get('/shortscale-v4', function (req, res) {
    let num = Number(req.query.n);
    let str = '' + shortscale_v4(num);
    res.send({num, str});
  });
});

// Run the server!
fastify.listen(3000, function (err, address) {
  if (err) {
    fastify.log.error(err);
    process.exit(1);
  }
  fastify.log.info(`server listening on ${address}`);
});