wp.customize is not a function

hi.
custom.js:

( function( $ ) {
    // Site feature
    wp.customize( 'title_feature', function( value ) {
        value.bind( function( to ) {
            $( '.awesome-slogan h3' ).html( to );
        } );
    } );

} )( jQuery );

————–
customizer.php:

<?php

function customize_register( $wp_customize ) {

    $wp_customize->add_setting( 'title_feature', array(
        'default'           => 'Default text',
        'transport'         => 'postMessage',
    ) );

    $wp_customize->add_control( 'title_feature', array(
        'label'    => __( 'Main feature', 'big' ),
        'section'  => 'title_tagline',
        'type'     => 'text',
        'priority' => 15,
    ) );

}
add_action( 'customize_register', 'customize_register', 11 );

function customize_preview_js() {
    wp_enqueue_script( 'custom', get_template_directory_uri() . '/assets/js/custom.js', array(), '20160824', true );
}
add_action( 'customize_preview_init', 'customize_preview_js' );

?>

I have read several times. You can solve the problem? Or stuffing rating?

Problem solved.
I used other jQuery version on front-end. In customization mode, jQuery embedded conflict with my jQuery. I fixed it.

bdanzer29, thx.