Flowtype class generic types are not stripped away

[bpatram]

Bug Report

Current Behavior
It seems using generics for classes does not correctly get striped away when compiled when using the flow preset.

Input Code

• https://github.com/bpatram/eslint-flow-generics/tree/babel-test

// @flow

class MyClass<T> {
  foo: T;

  constructor(foo: T) {
    this.foo = foo;
  }
}

export default new MyClass<string>('test');

gets output as

class MyClass {

  constructor(foo) {
    this.foo = foo;
  }
}

export default new MyClass() < string > 'test';

(note that <string> is not stripped away)

Expected behavior/code
I would expect < string > to not be included in the output.

Babel Configuration (.babelrc, package.json, cli command)

{
    "presets": [
        "flow"
    ]
}

Environment

• Babel version(s): v6.26.0
• Node/npm version: Node 8.11.0/npm 5.6.0
• OS: macOS 10.13
• How you are using Babel: cli

Additional context/Screenshots
Add any other context about the problem here. If applicable, add screenshots to help explain.

[babel-bot]

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so it's possible this won't be addressed swiftly.

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[loganfsmyth]

This syntax is relatively new in Flow and is only available in our 7.x-beta branch: #7934

[nicolo-ribaudo]

Closing since this is supported in Babel 7.