fix emoji detection issue

[01110111-wave]

Description

fix #108

Type of change

• Bug fix (non-breaking change which fixes an issue)

Screenshot

Checklist:

• I have run pnpm format and my code don't have any linting issues
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation

[dtinth]

thanks, this pr becomes much easier to review now.

• please update the isOnlyEmoji.spec.ts to remove the .todo so that tests are run

• please test with this emoji to make sure that your new implementation still matches this: 1️⃣ (see: https://stackoverflow.com/questions/64389323/why-do-unicode-emoji-property-escapes-match-numbers)

[dtinth]

thank you! all tests are passing now.

although there are rooms for improvement, every reviewed issue is contained within one file, which makes them easy to improve.

gonna merge this in for now and make it better later.