'use strict';

window.onload = function() {
    var data = JSON.parse(document.getElementById('swagger-data').innerText);

    var config = Object.assign({
        content: data.spec,
        theme: 'default',
    }, data.scalarExtraConfiguration || {});

    Scalar.createApiReference('#swagger-ui', config);
};
<br />
<b>Fatal error</b>:  Uncaught TypeError: Invalid return value: callable object expected, &quot;int&quot; returned from &quot;/app/public/bundles/apiplatform/init-scalar-ui.js&quot;. in /app/vendor/autoload_runtime.php:12
Stack trace:
#0 /app/public/index.php(18): require_once()
#1 {main}
  thrown in <b>/app/vendor/autoload_runtime.php</b> on line <b>12</b><br />