After reading through the documentation on "Generation and Iteration for ES5", I implemented this polyfill:
(Symbol as any).asyncIterator = Symbol.asyncIterator || Symbol.for("Symbol.asyncIterator");
However, upon doing so, my browser encountered an error:
Uncaught TypeError: Cannot assign to read only property ‘asyncIterator’ of function ‘function Symbol() { [native code] }’
To ensure the readonly property is only assigned when it does not already exist, use the following code snippet:
if (typeof (Symbol as any).asyncIterator === 'undefined') {
(Symbol as any).asyncIterator = Symbol.asyncIterator || Symbol('asyncIterator');
}
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