add ** to jsffi (#16141)

* fix rope index

* add testcase

* fix ropes format

* add `**` to jsffi

* add testcase

* changelog

Co-authored-by: Andreas Rumpf <rumpf_a@web.de>
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flywind 2020-11-27 03:30:19 +08:00 • committed by GitHub
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@ -47,6 +47,7 @@
- `repr` now doesn't insert trailing newline; previous behavior was very inconsistent,
see #16034. Use `-d:nimLegacyReprWithNewline` for previous behavior.
- Added `**` to jsffi.
- `writeStackTrace` is available in JS backend now.
## Language changes