Import multiple named exports of module into a single object

Sadly nothing like that is possible in the ECMA-262 specifications. They only lists these possibilities:

import defaultExport from "module-name";
import * as name from "module-name";
import { export1 } from "module-name";
import { export1 as alias1 } from "module-name";
import { export1 , export2 } from "module-name";
import { foo , bar } from "module-name/path/to/specific/un-exported/file";
import { export1 , export2 as alias2 , [...] } from "module-name";
import defaultExport, { export1 [ , [...] ] } from "module-name";
import defaultExport, * as name from "module-name";
import "module-name";
var promise = import("module-name");

Best that you can do (only add a single line) is the following:

import { cat, dog } from './animals';
const housePets = { cat, dog };

If you plan on using housePets in other modules then also export housePets as a part of animals.js

animals.js

import cat from './cat';
import dog from './dog';
import emu from './emu';
import pig from './pig';
import cow from './cow';

const housePets = { cat, dog }

export { cat, dog, emu, pig, cow };
export { housePets };

my-module.js

import { cat, dog, housePets } from './animals';

console.log(cat);
console.log(dog);
console.log(housePets);

As @johannchopin mentioned in their answer, this is not possible as per the latest specs. However if you want import ALL the exports from a file in a single key name, you can try something like this -

foo.js

const a = '123';
const b = 123;

export default { a, b };

bar.js

import KeyName from './temp';

console.log(KeyName.a, KeyName.b);