* lint: fix lint warning that is easy to fix

* lint: typesafe signature of seqOrText

* lint: typesafe createLanguage and language

* lint: typesafe seq

* lint: typesafe Parser.option

* fix: node can be string

* lint: typesafe alt

* fix: invalid url in link element will cause error

* chore: get rid of any

* fix: unnecessary import

* lint: kill any but still with loose type checking

* Revert "lint: kill any but still with loose type checking"

This reverts commit 8c7462f4a745800499a63ecf0632df3647b3e22c.

* lint: kill any again

* test: write type test

* ci: upgrade node version for lint