function isTypeScriptComponent(string_) {
  const regex = createTagRegex('script', 'gi');
// bad: use only first match
/*
  const match = regex.exec(string_);
console.log("match", match)
  const { lang } = parseAttributes((match?.length && match[1]) || '');
  return lang === 'ts';
*/
// good: use all matches
// https://stackoverflow.com/a/6323598/10440128
var isTypeScript = false;
string_.replace(regex, (...match) => {
//console.log("match:\n", match)
  const { lang } = parseAttributes((match?.length && match[1]) || '');
  if (lang === 'ts') isTypeScript = true;
});
return isTypeScript;
}

/** Create a tag matching regexp. */
function createTagRegex(tagName, flags) {
  console.log(`/<!--[^]*?-->|<${tagName}(\\s[^]*?)?(?:>([^]*?)<\\/${tagName}>|\\/>)`);
  return new RegExp(`/<!--[^]*?-->|<${tagName}(\\s[^]*?)?(?:>([^]*?)<\\/${tagName}>|\\/>)`, flags);
}

/** Transform an attribute string into a key-value object */
function parseAttributes(attributesString) {
  return attributesString
    .split(/\s+/)
    .filter(Boolean)
    .reduce((accumulator, attribute) => {
      const [name, value] = attribute.split('=');

      // istanbul ignore next
      accumulator[name] = value ? value.replace(/["']/g, '') : true;

      return accumulator;
    }, {});
}

var c = `
<script>
  console.log("hello from javascript")
</script>

<script lang="ts">
  console.log("hello from typescript")
  export let name: string | null;
</script>
`

console.log(
isTypeScriptComponent(c)
)

import sveltePreprocess from 'svelte-preprocess';

export default {
  preprocess: sveltePreprocess(),
};