function hashmapToRecord(hashmap: { [x: string]: any }) {
    return Object.entries(hashmap).reduce((rec, [key, value]) => {
        rec[key] = value;
        return rec;
    }, {} as Record<string, any>)
}

const arrayOfHashmaps: { [x: string]: any }[]  = [
    {
        is_this: "a_bug?"
    },
    {
        is_this: "a_bug?"
    },
    {
        is_this: "a_bug?"
    }
]

const arrayOfRecords = hashmapToRecord(arrayOfHashmaps);
console.log(arrayOfRecords);

/*
OUTPUT:
{
  "0": {
    "is_this": "a_bug?"
  },
  "1": {
    "is_this": "a_bug?"
  },
  "2": {
    "is_this": "a_bug?"
  }
}

Note: I see – I guess arrays are just ordered hashmaps. But do you see how the type interpreter thinks rec is any instead of { [x: string] : any }?
*/

const keys = arrayOfRecords.map((rec) => Object.keys(rec)) // <- There would be a red squiggly line on rec