➖ Remove the need for external safe compare

[amorriscode]

Description

Fixes #2

The safe-compare was an unneeded external dependency. This PR removes it and adds a file to do it without new deps.

To test locally I built a new Shopify App and started a local dev server. I was able to install the app on my test store.

Type of change

• Patch: Bug/ Documentation fix (non-breaking change which fixes an issue or adds documentation)
• Minor: New feature (non-breaking change which adds functionality)
• Major: Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

• I have added a changelog entry, prefixed by the type of change noted above

[amorriscode]

Thanks for catching my goofs @mkevinosullivan! 🙏

[mkevinosullivan]

👋 Hi Anthony, I was just about to merge in the changes and create a release until I noticed there are no unit tests for the safe-compare.ts file.

When you get a chance, can you create src/auth/test/safe-compare.test.ts and add a few unit tests please?

[amorriscode]

@mkevinosullivan I added a test but had a question. Although TypeScript is being used, safeCompare doesn't have protection again non-string input during runtime. I didn't see any guards in the code against things like that so just thought I'd ask if you want that handled?

[mkevinosullivan]

@mkevinosullivan I added a test but had a question. Although TypeScript is being used, safeCompare doesn't have protection again non-string input during runtime. I didn't see any guards in the code against things like that so just thought I'd ask if you want that handled?

It's generally a good idea, but I think it's OK given the limited usage here.

Thank you for the contribution!