feat(isEmoji): checks if string contains an emoji

[jmechn]

Had a look at the other isEmoji functions. One of my initial solutions I found was to use \p{Emoji}, however, it also accepts numbers and other symbols. There were other ones such as \p{Extended_Pictographic} but it didn't seem to work. I found that \p{Emoji_Presentation } worked but some emojis would not return true as they were considered symbols rather than an emoji, for example: ☂, ❤ , ©️, etc. Unfortunately the emoji unicode system is all over the place so I haven't been able to simplify the Regex to only accept the symbols that Emoji_Presentation cannot. Currently, the regex accepts emojis and emojis that are both symbols and emojis.

Checklist

• PR contains only changes related; no stray files, etc.
• README updated (where applicable)
• Tests written (where applicable)

[codecov]

Codecov Report

Merging #2015 (c5584a4) into master (1bb14e8) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master     #2015   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          104       105    +1     
  Lines         2203      2210    +7     
  Branches       477       478    +1     
=========================================
+ Hits          2203      2210    +7     

Impacted Files	Coverage Δ
src/index.js	100.00% <100.00%> (ø)
src/lib/isEmoji.js	100.00% <100.00%> (ø)

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[WikiRik]

This is an improvement to #1968 right?

[jmechn]

This is an improvement to #1968 right?

Yes, rather than listing all the possible emojis, the regex takes ranges of emojis. However, the regex definitely can be improved further.

[ParthJadhav]

LGTM... Regex could be simplified. But it works great !

[pano9000]

one question that comes to my mind here:
What is the purpose for this validator?
Does it make sense to check if a string contains an emoji somewhere, or should it rather check, if the supplied string is one (or even several?) emoji characters?

I can see the latter being useful, but I can't really see any practical application for the former.