NodeJS async/await and forEach

Question

I am using NodeJS version v10.15.3 and I have a code something like this:

async getItems(): Promise<Array<any>> {
    let retArray = [];
    await some.list.forEach(async function (someObj) {
        let item = new Item();
        await item.initialize(someObj);
        await retArray.push(item);
    }
    console.log("retArray="+JSON.stringify(retArray));
    retrn retArray;
}


async mainFunction() {
    let items = await getItems()
    console.log("items="+JSON.stringify(items));
}

When I call the mainFunction(), and when I log its result(the items), it does contain the expected value. But the weird thing is that inside this getItems() function, even with await on forEach (which adds an item to the retArray), when I print the retArray after the forEach right before the function returns it, it doesn't have the full value in it. I await for item to initialize, and I even await for the item to be pushed to the retArray.

It just doesn't make sense that this log shows empty list

console.log("retArray="+JSON.stringify(retArray));

yet this log shows full list that I expect.

console.log("items="+JSON.stringify(items));

How can I make it so that after the forEach, when I reference retArray like below

console.log("retArray="+JSON.stringify(retArray));

the retArray actually does contain the full data it gathered?