fix(build): switch to esbuild and tsc (#279)

* Initial attempt at switching to esbuild and tsc

* Remove ClientType value that's never used

* Update scripts/build.mjs

Co-authored-by: wolfy1339 <[email protected]>

* Update src/index.ts

Co-authored-by: wolfy1339 <[email protected]>

* Export type

* Add newline to build.mjs

* Add newline to tsconfig.json

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Co-authored-by: wolfy1339 <[email protected]>

Author: kfcampbell