Bug Report

Current Behavior
Looking at the documentation for type there is a tsUnknownType, but calling the function gives a TypeError: t.tsUnknownType is not a function

Input Code

const generate = require("@babel/generator").default;
const t = require("@babel/types");

const ast = t.tsUnknownType([t.tsAnyKeyword()]);

const { code } = generate(ast);
console.log(code);

Expected behavior/code
I believe the output should be unknown.

Babel Configuration (.babelrc, package.json, cli command)
N/A, this is more a tooling bug than babel behavior bug

Environment

• Babel version(s): 7.5.5
• Node/npm version: Node v10.12.0 / yarn 1.17.3
• OS: Ubuntu 18.04
• How you are using Babel: api

Possible Solution
Searching through this repo yields nothing, it might not exist (yet)?