# Formats Exposed

To develop, start a static file server in `public/`. There is no build step.

To deploy, copy the files from `public/` to a static file host.

To run tests, run `deno test`.

To format code, run `deno fmt`.

To lint, run `deno lint`.

To run type checks, run `deno task typecheck`.

To run all checks (tests, linting, code formatting, and type checks), run
`deno task check-all`.

## Code style

- Make sure all checks pass with `deno task check-all`.
- Prefer arrow functions.
- `throw` should be used when the developer makes a mistake, not for "expected"
  errors. For example, if someone uploads a bogus file, that shouldn't throw an
  error.
- Bad news first:
  - If a function returns `null` if an error case, define the type
    `null | Result`, not `Result | type`.
  - Test error cases first.