Use a js code for script block

Coding
1

hello
Can anyone tell me how to use this for the script block?i belive it need some changes,also i have no idea what should i put in input variable and how to set result

$client = new CognitoIdentityProviderClient([
    'version' => 'latest',
    'region'  => 'eu-west-1',
    'credentials' => false,
]);

$srp = new Srp();
$a = $srp->getRandomSeed();
$A = $srp->generateA($a);

$result = $client->initiateAuth([
    'UserPoolId'     => 'USER_POOL_ID',
    'ClientId'       => 'CLIENT_ID',
    'AuthFlow'       => 'USER_SRP_AUTH',
    'AuthParameters' => [
        'USERNAME' => 'USERNAME',
        'SRP_A'    => $A
    ]
]);

var finalSalt = "";