There's no reason to import modules you don't use; and every reason not to: doing so needlessly increases the load.

Finally, importing a module twice is pointless and confusing.

Noncompliant Code Example

import A from 'a';      // Noncompliant, A isn't used
import { B1 } from 'b';

console.log("My first JavaScript...");

import { B1 } from 'b'; // Noncompliant, already imported

console.log(B1);

Compliant Solution

import { B1 } from 'b';

console.log("My first JavaScript...");

console.log(B1);