export declarations may only appear at top level of a module

I’m facing an issue that seems very similar to #328 however it is occurring at runtime. I’m trying to add Routify to an existing application and getting the following error:

Firefox

Uncaught SyntaxError: export declarations may only appear at top level of a module

Brave

Uncaught SyntaxError: Unexpected token 'export'

I’ve gone through the documentation and changed my rollup.config.js output.format to esm as well as using output.dir instead of output.file.

I also found this similar issue in Sapper repo but it was closed without any comment/resolution.

---

app.ts

import App from './App.svelte';

const app = new App({
  target: document.body
});

export default app;

---

App.svelte

<script>
  import { Router } from '@roxy/routify';
  import { routes } from '../.routify/routes';
</script>

<Router {routes} />

---

rollup.config.js

import svelte from 'rollup-plugin-svelte';
import sveltePreprocess from 'svelte-preprocess';
import css from 'rollup-plugin-css-only';
import typescript from '@rollup/plugin-typescript';
import commonjs from '@rollup/plugin-commonjs';
import resolve from '@rollup/plugin-node-resolve';
import livereload from 'rollup-plugin-livereload';

const production = !process.env.ROLLUP_WATCH;

var serve = function() {
  let server;

  var toExit = function() {
    if (server) {
      server.kill(0);
    }
  }

  return {
    writeBundle() {
      if (server) {
        return;
      }

      server = require('child_process').spawn('npm', ['run', 'start', '--', '--dev'], {
        stdio: ['ignore', 'inherit', 'inherit'],
        shell: true
      });

      process.on('SIGTERM', toExit);
      process.on('exit', toExit);
    }
  }
}

export default {
  input: 'src/app.ts',
  output: {
    name: 'app',
    sourcemap: true,
    format: 'esm',
    dir: 'public/build'
  },
  plugins: [
    svelte({
      preprocess: sveltePreprocess({
        sourceMap: !production
      }),
      compilerOptions: {
        dev: !production
      }
    }),

    css({
      output: 'app.css'
    }),

    resolve({
      browser: true,
      dedupe: ['svelte']
    }),

    commonjs(),

    typescript({
      sourceMap: !production,
      inlineSources: !production
    }),

    !production && serve(),

    !production && livereload('public')
  ]
}

[rpf3]

I’ve discovered the issue is related to how the script is being loaded and I’ve opened the following PR on the docs to hopefully help anyone else in the future.

https://github.com/roxiness/routify.dev/pull/224

[jakobrosenberg]

https://jestjs.io/docs/ecmascript-modules