graphql/jsutils/inspect.mjs

A Query Language and Runtime which can target any service.

function _typeof(obj) { if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }

/**
 * Copyright (c) 2015-present, Facebook, Inc.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * 
 */
import nodejsCustomInspectSymbol from './nodejsCustomInspectSymbol';
/**
 * Used to print values in error messages.
 */

export default function inspect(value) {
  switch (_typeof(value)) {
    case 'string':
      return JSON.stringify(value);

    case 'function':
      return value.name ? "[function ".concat(value.name, "]") : '[function]';

    case 'object':
      if (value) {
        var customInspectFn = getCustomFn(value);

        if (customInspectFn) {
          // $FlowFixMe(>=0.90.0)
          var customValue = customInspectFn.call(value);
          return typeof customValue === 'string' ? customValue : inspect(customValue);
        } else if (Array.isArray(value)) {
          return '[' + value.map(inspect).join(', ') + ']';
        }

        var properties = Object.keys(value).map(function (k) {
          return "".concat(k, ": ").concat(inspect(value[k]));
        }).join(', ');
        return properties ? '{ ' + properties + ' }' : '{}';
      }

      return String(value);

    default:
      return String(value);
  }
}

function getCustomFn(object) {
  var customInspectFn = object[String(nodejsCustomInspectSymbol)];

  if (typeof customInspectFn === 'function') {
    return customInspectFn;
  }

  if (typeof object.inspect === 'function') {
    return object.inspect;
  }
}