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Use of Symbol breaks IE and older browser support #254

onexdata opened this Issue Jul 13, 2018 · 2 comments


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onexdata commented Jul 13, 2018

I didn't see this issue in 4.1.1, but it looks like 4.2.0 uses Symbol, which is certainly not compatible with the older browsers listed on (Internet Explorer 5.5+, Firefox 1.5+, Chrome, Safari 3+, and Opera 11+)


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slevithan commented Jul 13, 2018 is currently out of date and only lists pre-v4 versions at This is on me to upgrade since the documentation is not currently open source. :'( I aim to fix this but am not able to provide a timeline at this time.

XRegExp moved to only support ES5+ browsers in v4.0.0.

Looks like use of Symbol.iterator in xregexp-all.js came from @josephfrazier's 8c02a0a and is indeed new in v4.2.0. This might have been unintentional. @josephfrazier, what do you think is the best path forward for this?


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josephfrazier commented Jul 15, 2018

Thanks for tracking down that commit, it looks like #238 also had changes which introduced Symbol to xregexp-all.js. See #255 for a potential fix.

GerHobbelt added a commit to GerHobbelt/xregexp that referenced this issue Sep 2, 2018

revert last few commits and merge after code inspection: we don't car…
…e about antique platforms where those polyfills are needed! This is the commits list that's being reverted here:

SHA-1: 7a16887

* Polyfill Symbol with @babel/plugin-transform-runtime

This should fix slevithan#254


SHA-1: e83ce58

* Merge remote-tracking branch 'remotes/slevithan-original/master'

# Conflicts:
#	.babelrc
#	package-lock.json
#	package.json

SHA-1: cce9e7c

* regenerate library files
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