JavaScript: handle spread syntax

[masatake]

Related to #3435.

---

JavaScript: handle spread syntax

With this change, the parser skip "..." and the subsequent expression.

ref. https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Spread_syntax

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (d5aa12d) 85.02% compared to head (014fbcd) 85.02%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3846   +/-   ##
=======================================
  Coverage   85.02%   85.02%           
=======================================
  Files         228      228           
  Lines       53897    53900    +3     
=======================================
+ Hits        45828    45831    +3     
  Misses       8069     8069           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[masatake]

I must add a reference to a page describing the spread operator.

[leleliu008]

@masatake our GitHub Actions BSD workflows alwasy fail these days. I have no idea how to fix it. The only way is waiting GitHub Actions Team's fix. Reference: actions/runner-images#8730

[masatake]

@leleliu008 Thank you. Could you make a "temporarily disabling" pull request and merge it?

[leleliu008]

@leleliu008 Thank you. Could you make a "temporarily disabling" pull request and merge it?

Done via #3848

[masatake]

It seems that "spread operator" is a term in TypeScript.
After reading https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Spread_syntax, "spread syntax" is the term I should use here.