* Add tsconfig.json for common
* Prefer `const` over `let` over `var`
* Kill dead code
* Fix some trivial Typescript issues
* Turn on Typescript linting in common except for no-explicit-any
* Correctly specify tsconfig dir name in functions eslintrc
* Set common package.json sideEffects: false
* Configure SWC to modularize lodash imports
* Import specific lodash functions instead of _
* Add an eslint rule to avoid full lodash import