Why is this an issue?

This rule checks that all string literals use the same kind of quotes.

Noncompliant code example

Using the parameter default (forcing single quotes):

var firstParameter = "something"; // Noncompliant

Compliant solution

var firstParameter = 'something';

Exceptions

Strings that contain quotes are ignored.

let heSaid = "Then he said 'What?'."  // ignored
let sheSaid = '"Whatever!" she replied.'  // ignored

Resources

Documentation