Consider adding fail-fast ERROR nodes to better guide Tree-sitter error recovery

[novusnota]

See: tree-sitter-grammars/tree-sitter-readline@e436eae#diff-919ac210accac9ecc55a76d10a7590e3d85ca3f0e165b52d30f08faee486d0cb

The code at the link above adds the following node alias:

const ERROR_ALIAS = ($) =>
  alias(token(prec(-1, ANYTHING_STARTING_NON_WHITESPACE)), $.ERROR);

And then it's used in appropriate choice() rules (aka | in EBNF notation) to fail fast and introduce error nodes earlier, thus improving the resulting CST. That said, this approach doesn't (yet) create actual ERROR nodes that Tree-sitter produces on errors, but merely aliases the nodes to $.ERROR. In practice, that's close enough.

P.S.:

// Some other useful regexes
const WHITE_SPACE = /[ \t\f\v]/;
const ANYTHING = /[^\r\n]+/;
const ANYTHING_STARTING_NON_WHITESPACE = /\S[^\r\n]*/;