Convert to destructed refactoring not enabled in JavaScript?

TypeScript Version: 3.5.0-dev.20190404

Search Terms:

• refactor / refactoring
• convert to destructed parameters

Code
For a simple js file

function doStuff(a, b, c) {
    return a + b + c;
}

doStuff('a', 'b', 1);
doStuff('x', 'y', 2);

Expected behavior:
A convert to restructured refactoring is available on doStuff

Actual behavior:
I'm not seeing any such refactoring show up in js files

Playground Link:

Related Issues:

• #23552

从 TypeScript language-service 的重构实现开始，并将 JavaScript 支持与 issue #23552 所引用的现有行为进行比较。在 JavaScript 文件中重现该示例，并确定所请求的解构重构是否应当在那里出现；完成的标准是该重构在那里可用，并且有适当的测试覆盖。