自定义函数以来，例如

async function foo() {
    return 10;
}

可以在使用之前使用在javascript中定义，Babel会在编译过程中将其移至文件顶部.

can be used before they're defined in javascript, Babel is moving it to the top of the file during transpilation.

要解决此问题，请尝试尝试调整语法:

To work around this, this try adjusting your syntax if possible:

const foo = async function() {
    return 10;
}