You could specify two types of module export in module file.
export default method1() {...}
export method2() {...}
export method3() {...}
When importing from above library
To import method1 we should write
Import x from "lib"; // default import is method1
Import {method3} from "lib"; // only method3 is imported
Import * as methods from "lib";
// you get
Methods = {method2, method3, default: {method1}}
If there is no default export
Export method1(){}
Export method2(){}
Export method3(){}
Import methods from 'lib'; // undefined
Import {method3} from 'lib'; // it works
Import * as methods from 'lib'; // which has {method1, method2, method3}