[SBA-02] update typescript and add typecheck script

[jamaljsr]

Summary

This is another preparatory PR in the Session-based Auth saga, which updates typescript to use the latest version.

I've also added an explicit yarn typecheck command to ensure the TS code is valid via the CLI.

Technical Notes

In order to include the unit tests in the type checking, but exclude it from the build output, I needed to introduce an additional tsconfig file. This is used only for type checking and it includes *.test.ts files and the test dir. The default tsconfig.json file is used for the webpack build and this excludes the tests.

Steps to Test

1. Update dependencies with yarn install
2. Check the types with yarn typecheck

Related Issues & Pull Requests

• Session-Based Authentication & Passkeys #128

Depends on:

• [SBA-01] chore: normalize indentation to 2 spaces #130

[jbrill]

Just one nit -- otherwise approved

[jamaljsr]

@jbrill Thanks for reviewing. I've made the change requested.

[jbrill]

tACK LGTM 👍

yarn run v1.22.22
(node:43418) [DEP0169] DeprecationWarning: `url.parse()` behavior is not standardized and prone to errors that have security implications. Use the WHATWG URL API instead. CVEs are not issued for `url.parse()` vulnerabilities.
(Use `node --trace-deprecation ...` to show where the warning was created)
$ tsc --noEmit --project tsconfig.typecheck.json
✨  Done in 1.05s