[Bug]: Wrong prototype for functions using function.sent

[dead-claudia]

💻

• Would you like to work on a fix?

How are you using Babel?

Programmatic API (babel.transform, babel.parse)

Input code

REPL: https://babeljs.io/repl#?browsers=defaults%2C%20not%20ie%2011%2C%20not%20ie_mob%2011&build=&builtIns=false&corejs=3.21&spec=false&loose=false&code_lz=GYVwdgxgLglg9mABAKigUwM5QBQEpEDeAUIogJ4xoA2AJoqJLAgHQZphQDcRAvkelmYAHAE5wo4skLTNgcOIgC8iAIxEAbgEMRiAObsliATlxEYwRNgCE-sLPn5ipKAAsxAd0Rg0ngKIixEWwAIgADW3s4UK9xejhwGmDTHiA&debug=false&forceAllTransforms=false&modules=false&shippedProposals=false&circleciRepo=&evaluate=true&fileSize=false&timeTravel=false&sourceType=module&lineWrap=true&presets=&prettier=false&targets=&version=7.21.3&externalPlugins=%40babel%2Fplugin-proposal-function-sent%407.18.6&assumptions=%7B%7D

function *test() {
  yield function.sent;
}
test.prototype.foo = 1
var gen = test()
if (!gen.foo) {
  throw new Error("`gen.foo` not found")
}

Configuration file name

No response

Configuration

No response

Current and expected behavior

Current behavior: throws an error with message `gen.foo` not found
Expected behavior: doesn't throw

Environment

• Babel: v7.21.3
• Whatever else is the case for the online REPL

Possible solution

Here's two possible solutions:

1. Add in an extra test.prototype = _test.prototype after the function (easiest, but doesn't tree-shake)
2. Keep test as a generator and instead of returning the iterator directly, returning yield* _test.apply(this, arguments) (tree shakes, but adds some extra overhead)

Additional context

No response

[babel-bot]

Hey @dead-claudia! We really appreciate you taking the time to report an issue. The collaborators on this project attempt to help as many people as possible, but we're a limited number of volunteers, so it's possible this won't be addressed swiftly.

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