Custom scalar types should be listed in typesUsed about apollo-tooling HOT 4 CLOSED

{
          "kind": "SCALAR",
          "name": "DateTime",
          "description": null,
          "fields": null,
          "inputFields": null,
          "interfaces": null,
          "enumValues": null,
          "possibleTypes": null
        }

"kind": "OBJECT",
          "name": "Product",
          "description": null,
          "fields": [
            ...
            {
              "name": "createdAt",
              "description": null,
              "args": [],
              "type": {
                "kind": "NON_NULL",
                "name": null,
                "ofType": {
                  "kind": "SCALAR",
                  "name": "DateTime",
                  "ofType": null
                }
              },
              "isDeprecated": false,
              "deprecationReason": null
            },

query ShopWithDate {
  shop {
    products(first:50) {
      edges {
        node {
          title
          createdAt
        }
      }
    }
  }
}

{
	"operations": [
		{
			"operationName": "ShopWithDate",
			"operationType": "query",
			"variables": [],
			"source": "query ShopWithDate {\n  shop {\n    products(first: 50) {\n      edges {\n        node {\n          title\n          createdAt\n        }\n      }\n    }\n  }\n}",
			"fields": [
				{
					"responseName": "shop",
					"fieldName": "shop",
					"type": "Shop!",
					"fields": [
						{
							"responseName": "products",
							"fieldName": "products",
							"type": "ProductConnection!",
							"fields": [
								{
									"responseName": "edges",
									"fieldName": "edges",
									"type": "[ProductEdge!]!",
									"fields": [
										{
											"responseName": "node",
											"fieldName": "node",
											"type": "Product!",
											"fields": [
												{
													"responseName": "title",
													"fieldName": "title",
													"type": "String!"
												},
												{
													"responseName": "createdAt",
													"fieldName": "createdAt",
													"type": "DateTime!"
												}
											],
											"fragmentSpreads": [],
											"inlineFragments": []
										}
									],
									"fragmentSpreads": [],
									"inlineFragments": []
								}
							],
							"fragmentSpreads": [],
							"inlineFragments": []
						}
					],
					"fragmentSpreads": [],
					"inlineFragments": []
				}
			],
			"fragmentsReferenced": []
		}
	],
	"fragments": [],
	"typesUsed": []
}