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fix(js): quote property name as es5 compatible #5157

merged 1 commit into from Sep 28, 2018


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koba04 commented Sep 28, 2018

Currently, Prettier quotes property names if the name isn't es6 compatible.
It means that Prettier might strip the quote for a property name that is es6 compatible but is not es5 compatible.
So this might break scripts on ES5 environments.

For example, the following example doesn't work on some ES5 environments.
You can try the script on Node v0.12.

Prettier 1.14.3
Playground link

--parser babylon


var obj = {
 "饜姧": 'ok'



var obj = {
  饜姧: "ok"


This PR is to fix this.

  • I鈥檝e added tests to confirm my change works.
  • (If changing the API or CLI) I鈥檝e documented the changes I鈥檝e made (in the docs/ directory)
  • I鈥檝e read the contributing guidelines.

@j-f1 j-f1 requested a review from duailibe Sep 28, 2018


lydell approved these changes Sep 28, 2018

I think this makes sense. Haven't we said before that by default we don't want to turn es5 into es6 鈥 that's the reason we won't default trailing-comma to "all"?

I think using this kind of identifiers is not very common, so it should be a non-controversial change.

So 馃憤 from me.

@duailibe duailibe merged commit 3e05f21 into prettier:master Sep 28, 2018

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koba04 commented Sep 29, 2018

Thank you!

@koba04 koba04 deleted the koba04:es5-compatible-property-name branch Sep 29, 2018

@ikatyang ikatyang added this to the 1.15 milestone Oct 25, 2018

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