Line Breaks fix

[Filyus]

If you use \r\n instead of \n in main.js, then one extra \r appears in the generated code (before generateFile() call). The buggy code is somewhere else, but this fix is simple and works.

[Filyus]

An example of incorrectly incoming code that produces an error:

                                \r;                                                                                                                               const impørt_mêtä = { hot: __compatNollup__(module) };\n
\r\n
const app = new App({target: document.body});\r\n
\r\n
__e__('default', app);;\r\n
\r\n
// recreate the whole app if an HMR update touches this module\r\n
if (impørt_mêtä.hot) {\r\n
  impørt_mêtä.hot.dispose(() => {\r\n
    app.$destroy();\r\n
  })\r\n
  impørt_mêtä.hot.accept();\r\n
}\r\n

Source code (\r\n after every line):

import App from './App.svelte';

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

export default app;

// recreate the whole app if an HMR update touches this module
if (import.meta.hot) {
  import.meta.hot.dispose(() => {
    app.$destroy();
  })
  import.meta.hot.accept();
}

[Filyus]

I thought the reason was the rollup-plugin-hot code, but this function is not even called:

const splitFirstLine = code => {
  const eolIndex = code.indexOf('\n')
  if (eolIndex === -1) {
    return ['', '', code]
  }
  const firstLine = code.slice(0, eolIndex)
  if (/\bimport\.meta\b/.test(firstLine)) {
    return [firstLine, code.slice(eolIndex + 1), '']
  }
  return [firstLine, '', code.slice(eolIndex + 1)]
}

I tried to fix it with this code, but the problem is somewhere else:

const splitFirstLine = code => {
  const regex = /(.*?)\r?\n(.*)/s
  const matches = code.match(regex)
  if (matches) {
    const firstLine = matches[1]
    const restLines = matches[2]
    if (/\bimport\.meta\b/.test(firstLine)) {
      return [firstLine, restLines, '']
    }
    return [firstLine, '', restLines]
  }
  else {
    return ['', '', code]
  }
}

[Filyus]

The example code was taken from here:
https://github.com/rixo/svelte-template-hot

[PepsRyuu]

That's strange. I'm not sure what would cause there to be a stray \r. For the purpose of writing a regression test, would be important to figure out what's causing it.

[Filyus]

I was right that the error is in the splitFirstLine() function, but it is in a this file:
\node_modules\rollup-plugin-hot-nollup\compat-nollup.js
but not that:
\node_modules\rollup-plugin-hot\lib\compat-nollup.js

[Filyus]

I will talk about this issue with rixo.