svelte/register

Component.svelte

<script>
	let name = 'world';
</script>

<h1>Hello {name}!</h1>

dev.env

SECRET_A=XXX
SECRET_B=YYY

index.js

// require('svelte/register');
const fs = require('fs');
const svelteCompiler = require('svelte/compiler');

require.extensions['.svelte'] = function (module, filename) {
  const content = fs.readFileSync(filename, 'utf-8');
  const { js } = svelteCompiler.compile(content, {
    generate: 'ssr',
    format: 'cjs'
  });
  return module._compile(js.code, filename);
}

require.extensions['.env'] = function (module, filename) {
  const content = fs.readFileSync(filename, 'utf-8');
  const obj = {};
  content.split('\n').forEach((line) => {
    const [key, value] = line.split('=');
    obj[key] = value;
  });

  return module._compile(`module.exports = ${JSON.stringify(obj)};`, filename);
  // module.exports = { secret_a: 'xxx', secret_b = 'yyy' }
};

const envVariables = require('./dev.env');
console.log('envVariables', envVariables);


require.extensions['.svelte'] = function (module, filename) {
  const content = fs.readFileSync(filename, 'utf-8');
  const { js } = svelteCompiler.compile(content, {
    generate: 'ssr',
    format: 'cjs'
  });
  return module._compile(js.code, filename);
}