async-generator
async-generator is a lightweight shim for async generator functions. - https://github.com/rafaelgieschke/async-generator
Usage
It allows you to write:
async function* getFiles() {
for (var i = 0; i < 10; i++) {
yield (await fetch(i)).text();
}
return "done";
}
as:
import asyncGenerator from "https://rafaelgieschke.github.io/async-generator/async-generator.js";
const getFiles = asyncGenerator(function* () {
for (var i = 0; i < 10; i++) {
yield [(yield fetch(i)).text()];
}
return "done";
});
(You can also use include <script src="https://rafaelgieschke.github.io/async-generator/async-generator.global.js"></script> to have ayncGenerator defined in the global scope without ECMAScript modules.)
So, you simply have to replace await with yield and yield ... with yield [...].
(This also means, you cannot “await” an Array.)
Async iteration
You do not need a shim for async iteration, as you can always write:
(async () => {
for await (const file of getFiles()) {
console.log(file);
}
})();
as:
(async () => {
for (let file, __iter = getFiles()[Symbol.asyncIterator](); !({value: file} = await __iter.next()).done;) {
console.log(file);
}
})();
License
