get-iterator/dist/src/index.js

Get the default iterator or async iterator for an iterable or async iterable

export function getIterator(obj) {
    if (obj != null) {
        if (typeof obj[Symbol.iterator] === 'function') {
            return obj[Symbol.iterator]();
        }
        if (typeof obj[Symbol.asyncIterator] === 'function') {
            return obj[Symbol.asyncIterator]();
        }
        if (typeof obj.next === 'function') {
            return obj; // probably an iterator
        }
    }
    throw new Error('argument is not an iterator or iterable');
}
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