（ES6）类（ES7）async / await getter [英] (ES6) class (ES7) async / await getter

问题描述

是否可能有一个ES6类getter
从一个ES7等待/异步函数返回一个值。

Is it or will it be possible to have an ES6 class getter return a value from an ES7 await / async function.

class Foo {
    async get bar() {
        var result = await someAsyncOperation();

        return result;
    }
}

function someAsyncOperation() {
    return new Promise(function(resolve) {
        setTimeout(function() {
            resolve('baz');
        }, 1000);
    });
}

var foo = new Foo();

foo.bar.should.equal('baz');

推荐答案

您只能等待 promises，而 async 函数将自动返回承诺。

当然，getter可以产生这样的承诺，还有与正常值无差异。

You can only await promises, and async functions will return promises themselves.
Of course a getter can yield such a promise just as well, there's no difference from a normal value.

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