What code were you trying to parse?

/** @type {Date} */ (expr)

What did you expect to happen?

There are cases when AST consumers need to know whether an expression had parens. Babel adds .extra.parenthesized: true to nodes. My proposal is to do the same thing. For example, this feature would be useful for Prettier to format Closure-style type casts properly.

What actually happened?

The parser ignores parens when building the AST.

Versions

not relevant