jiangphcn opened a new pull request #2345: port to spidermonkey 60
URL: https://github.com/apache/couchdb/pull/2345
 
 
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   ## Overview
   
   <!-- Please give a short brief for the pull request,
        what problem it solves or how it makes things better. -->
   
   Port SpiderMonkey from `1.8.5` to `6.0`, i.e `mozjs-60.1.1pre3` from 
https://ftp.mozilla.org/pub/spidermonkey/prereleases/60/pre3/ aligning with the 
version used in planned CouchDB 4.0. This allows CouchDB 3.0 to address 
existing issues in legacy spidermonkey version and use new features provided in 
new version of spidermonkey.
   
   One outstanding topic is about CouchDB-style function declaration. 
   `"map": "function(doc) {emit(doc._id, doc._id);}"`
   
   By means of the original transpile idea from the couch-chakra PoC from 
@dmunch, currently both traditional CouchDB-style function declaration and  
modern function declaration like below are supported in CouchDB 3.0 if 
spidermonkey 6.0 is selected.
   
   `"map": "(function (doc) {emit(doc._id, doc._id);});"`
   
   In order to provide enough flexibility, one switch is introduced when 
running `configure`. Currently, the supported value is `1.8.5` and `60`. (the 
default value is 1.8.5 and will be changed to 60 later)
   ```
   ./configure  --spidermonkey-version=60 (non-windows version)
   powershell -ExecutionPolicy Bypass .\configure.ps1 -WithCurl 
-SpiderMonkeyVersion=60 (windows version)
   ```
   ## Testing recommendations
   
   <!-- Describe how we can test your changes.
        Does it provides any behaviour that the end users
        could notice? -->
   All test below are involved and run successfully again.
   ```
    - Make test-cluster-with-quorum
    - Make test-cluster-without-quorum
    - Make eunit
    - Make javascript
    - Make mango-test
    - Make elixir
   ```
   
   ## Related Issues or Pull Requests
   
   <!-- If your changes affects multiple components in different
        repositories please put links to those issues or pull requests here.  
-->
   https://github.com/apache/couchdb/pull/2170 is PR when starting to work on 
this task.
   https://github.com/apache/couchdb-glazier/pull/11
   
   ## Checklist
   
   - [X] Code is written and works correctly
   - [X] Changes are covered by tests
   - [ ] Any new configurable parameters are documented in 
`rel/overlay/etc/default.ini`
   - [ ] A PR for documentation changes has been made in 
https://github.com/apache/couchdb-documentation
   

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