If using translation functions with placeholders in them, they need accompanying translator comments.
Examples of incorrect code for this rule:
var color = '';
sprintf( __( 'Color: %s' ), color );
var address = '';
sprintf( __( 'Address: %s' ), address );
// translators: %s: Name
var name = '';
sprintf( __( 'Name: %s' ), name );
Examples of correct code for this rule:
var color = '';
// translators: %s: Color
sprintf( __( 'Color: %s' ), color );
var address = '';
sprintf(
// translators: %s: Address.
__( 'Address: %s' ),
address
);