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function createAsyncFunction(fn) { | |
return function () { | |
var gen = fn.apply(this, arguments); | |
return new Promise(function (resolve, reject) { | |
function step(key, arg) { | |
try { | |
var info = gen[key](arg); | |
var value = info.value; | |
} catch (error) { | |
reject(error); | |
return; | |
} | |
if (info.done) { | |
resolve(value); | |
} else { | |
return Promise.resolve(value).then(function (value) { | |
step("next", value); | |
}, function (err) { | |
step("throw", err); | |
}); | |
} | |
} | |
return step("next"); | |
}); | |
}; | |
} |
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So it's a polyfill from Babel, nevermind then.