Prepack emits yield outside of generator function

Description

"use strict";

var object = {
  *["a"]() {
    yield 1;
    yield 2;
  },
};

var x = Object.keys(object);

"use strict";

var x, object;
(function () {
  var _$0 = this;

  var _3 = function () {
    yield 1; // <---------------------------------- Yield outside of generator!
    yield 2;
  };

  _$0.object = {
    a: _3
  };
  _$0.x = ["a"];
}).call(this);

Contributor guide

Tech stack

javascript

Domain

tooling

Issue type

bug

DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.

3

Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.

1-3 hours

Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.

stale

ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.

clear

Prerequisites

understanding of JavaScript generatorsfamiliarity with Prepack codebase

Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.

30

Research direction

Investigate the transformer for computed property generator methods in object literals. Ensure that the inner function retains its generator status (the '*' before function) even when extracted. Look for similar issues in the codebase or any linked PRs that might have attempted to fix this.