TODO

Add root rule
Add support for imports (e.g. define a "iso8601" reference, and then use it in a "date" field in another rule)
Add cardinality support (oneOrMore, zeroOrMore, optional)
Add sugar:
- list allows "listItem, listItem, listItem" or "- listItem\n- listItem\n- listItem", etc. unrolls to "- " listItem ('\n- ' listItem)*
- premades for things like digit, letter, whitespace, etc.
- allow ranges to be numeric, e.g. "a"{2,5} desugars to "a" "a" ("a" ("a" ("a")?)?)?
Add composability types:
- grammar.root(r=>r.oneOf('a', 'b')) finalizes the grammar
- grammar.extend(otherGrammar) merges two grammars, as long as otherGrammar doesn't have a root, and there are no rule conflicts (in which case, throw). Make sure that when extending, the references of otherGrammar become available for use in the new grammar.
Add JSDoc explanations for each rule and method
Ensure coverage is up to snuff
Add husky to lint and prettify on commit
Add CI
Package and publish on npm
Add more examples

Research

Check if we can have a grammar.test(someString) method that returns a boolean if the string matches the grammar