test: fix tests

[SamVerschueren]

I'm still trying to figure out why on earth the compilation suddenly started failing. The reason for it is just ridiculous.

I found out that every module we load in languages.ts and which we call with an object, cannot use the shorthand return syntax.

wrong

import('@codemirror/lang-javascript').then((module) => module.javascript({ typescript: true }));

correct

import('@codemirror/lang-javascript').then((module) => {
  return module.javascript({ typescript: true });
});

I'll buy anyone a drink that can explain me why on earth the compiler failed on that syntax.

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[SamVerschueren]

It was a bug in Vite and was fixed here vitejs/vite#17479.