为什么我的无效的科拉斯式操作员没有被汇总插件转移给Babel？
我有一个Svelte项目，我想使用Rollup Plugin @lollup/plumin/plugin-babel将无效的无效操作员（ES2020）转换为ES5，它是默认情况下启用了@babel/preset-env-env，因为babel v7.6.3 。
但是，在我的项目中，它行不通。我在这样的组件中的脚本标签中有一个无效的coalascing操作员：
<script>
let count = 0;
let aCool;
let canio;
const increment = () => {
if (count % 6 === 0) {
canio = 1;
}
count += 1;
aCool = canio ?? 0;
};
console.log('aCool', aCool);
</script>
可以找到一个最小的svelte项目在这里。
Babel似乎正在运行并添加来自Core-Js的多填充物，但它与??运算符无关。为什么不移交？
I have a svelte project that I would like to transpile nullish-coalascing operators (es2020) to es5 using the rollup plugin @rollup/plugin-babel which is enabled by default in @babel/preset-env since babel v7.6.3.
However in my project it does not work. I have a nullish-coalascing operator in a script tag in a component like this:
<script>
let count = 0;
let aCool;
let canio;
const increment = () => {
if (count % 6 === 0) {
canio = 1;
}
count += 1;
aCool = canio ?? 0;
};
console.log('aCool', aCool);
</script>
A minimal svelte project can be found here.
Babel seems to run and add the polyfills from core-js but it does nothing with the ?? operator. Why is it not transpiled?
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我发现它不起作用的原因是因为我忘了将
.svelte作为文件扩展名，而Babel应该在 rollup插件因此，它甚至都不查看Svelte代码。谢谢@jlhwung！I found out the reason why it does not work is because I forgot to set
.svelteas a file extension that Babel should transpile in the rollup plugin hence it doesn't even look at the svelte code. Thanks @JLHwung!!