fix: fallback to transpiled code on Node.js version <8.6.0

[pieh]

As mentioned in #159 (comment), prompts crashes on Node versions between 8.0 and 8.6 because of usage of object spread operator (for example in

prompts/lib/index.js

Line 35 in 91be062

question[key] = typeof value === 'function' ? await value(answer, { ...answers }, question) : value;

)

This change will serve transpiled code on Node versions that don't support object spread operator

fixes #159

[lukeed]

Hey, thanks!

I know (almost) for a fact that @terkelg won't want to bring in a new library for this, especially one this big. 😬I was commenting on the issue but you were faster with the PR 😄

(I just released semiver because I often run into this same issue, and don't want to load all 62kB of semver)

The simplest fix would be to check for < 9 – the drawback is that everyone on Node 8.x still gets the Babel output, even if their version would be compatible.

I'd recommend we do something like this:

// Are we over v8.2.0?
function isOkay(tar) {
  tar = (Array.isArray(tar) ? tar : tar.split('.')).map(Number);
  let i=0, src=process.versions.node.split('.').map(Number);
  for (; i < tar.length; i++) {
    if (src[i] > tar[i]) return true;
    if (tar[i] > src[i]) return false;
  }
  return true;
}

module.exports = isOkay('8.2.0') ? require(...) : require(...);

Edit: First code snippet was wrong!

[pieh]

Thanks for quick review. Yeah, I'll make use of some helper to not pull entirity of semver

Will need to adjust your snippet as it required all major, minor and patch to be higher tho :P

[lukeed]

Yeah, I fixed it @pieh I messed up the first one. The above/current will work

[pieh]

Pushed changes, just inverted checks and added (hopefully) more descriptive name than isOkay

Once again, thanks!

[lukeed]

Looks good! 👍 Deferring to @terkelg for final verdict

[terkelg]

Thank you guys! Looks good – appreciate the help 💯