es6转换问题

[yzend]

Describe the bug
源项目是 微信，再编译后转 es5 Set的解构有问题
以及 array的entries() 迭代器转换问题

To Reproduce
Steps to reproduce the behavior:
let a = [1,2,3]
a = [...new Set(a)]
console.log(a, 'a')
// [] a为空数组

for (const [index, ele] of a.entries()) {
console.log(index, ele)
// 不触发 console
}

Expected behavior
预期期望出现 [1,2,3]

迭代器出现
0,1
1,2
2,3
myapp.zip

Screenshots
If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context
Add any other context about the problem here.

[yzend]

https://stackoverflow.com/questions/33464504/using-spread-syntax-and-new-set-with-typescript

在typescript 进行编译的时候 需要使用新的 迭代器协议
function tsTransform() {
const tsCompilerOptions = {
downlevelIteration: true
}
}
是否考虑增加 默认降级迭代器协议