const aggregates = await client.files.aggregate({ filter: { uploaded: true } });
console.log('Number of uploaded files: ', aggregates[0].count)

aggregate_uploaded = client.files.aggregate(filter={"uploaded": True})

Aggregate fileAggregate = 
          client.files().aggregate(Request.create() 
          .withFilterParameter("source", "source"));

curl --request POST \
  --url https://{cluster}.cognitedata.com/api/v1/projects/{project}/files/aggregate \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "filter": {
    "name": "<string>",
    "directoryPrefix": "/my/known/directory",
    "mimeType": "image/jpeg",
    "metadata": {},
    "assetIds": [
      363848954441724,
      793045462540095,
      1261042166839739
    ],
    "assetExternalIds": [
      "externalId1",
      "externalId2",
      "externalId3"
    ],
    "rootAssetIds": [
      {
        "id": 123456789
      },
      {
        "externalId": "system 99 external Id 1234"
      }
    ],
    "dataSetIds": [
      {
        "id": 4503599627370496
      }
    ],
    "assetSubtreeIds": [
      {
        "id": 123456789
      },
      {
        "externalId": "system 99 external Id 1234"
      }
    ],
    "source": "<string>",
    "createdTime": {
      "max": 1,
      "min": 1
    },
    "lastUpdatedTime": {
      "max": 1,
      "min": 1
    },
    "uploadedTime": {
      "max": 1,
      "min": 1
    },
    "sourceCreatedTime": {
      "max": 1,
      "min": 1
    },
    "sourceModifiedTime": {
      "max": 1,
      "min": 1
    },
    "externalIdPrefix": "my.known.prefix",
    "uploaded": true,
    "labels": {
      "containsAny": [
        {
          "externalId": "my.known.id"
        }
      ]
    }
  }
}
'

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://{cluster}.cognitedata.com/api/v1/projects/{project}/files/aggregate",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'filter' => [
        'name' => '<string>',
        'directoryPrefix' => '/my/known/directory',
        'mimeType' => 'image/jpeg',
        'metadata' => [
                
        ],
        'assetIds' => [
                363848954441724,
                793045462540095,
                1261042166839739
        ],
        'assetExternalIds' => [
                'externalId1',
                'externalId2',
                'externalId3'
        ],
        'rootAssetIds' => [
                [
                                'id' => 123456789
                ],
                [
                                'externalId' => 'system 99 external Id 1234'
                ]
        ],
        'dataSetIds' => [
                [
                                'id' => 4503599627370496
                ]
        ],
        'assetSubtreeIds' => [
                [
                                'id' => 123456789
                ],
                [
                                'externalId' => 'system 99 external Id 1234'
                ]
        ],
        'source' => '<string>',
        'createdTime' => [
                'max' => 1,
                'min' => 1
        ],
        'lastUpdatedTime' => [
                'max' => 1,
                'min' => 1
        ],
        'uploadedTime' => [
                'max' => 1,
                'min' => 1
        ],
        'sourceCreatedTime' => [
                'max' => 1,
                'min' => 1
        ],
        'sourceModifiedTime' => [
                'max' => 1,
                'min' => 1
        ],
        'externalIdPrefix' => 'my.known.prefix',
        'uploaded' => true,
        'labels' => [
                'containsAny' => [
                                [
                                                                'externalId' => 'my.known.id'
                                ]
                ]
        ]
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://{cluster}.cognitedata.com/api/v1/projects/{project}/files/aggregate"

	payload := strings.NewReader("{\n  \"filter\": {\n    \"name\": \"<string>\",\n    \"directoryPrefix\": \"/my/known/directory\",\n    \"mimeType\": \"image/jpeg\",\n    \"metadata\": {},\n    \"assetIds\": [\n      363848954441724,\n      793045462540095,\n      1261042166839739\n    ],\n    \"assetExternalIds\": [\n      \"externalId1\",\n      \"externalId2\",\n      \"externalId3\"\n    ],\n    \"rootAssetIds\": [\n      {\n        \"id\": 123456789\n      },\n      {\n        \"externalId\": \"system 99 external Id 1234\"\n      }\n    ],\n    \"dataSetIds\": [\n      {\n        \"id\": 4503599627370496\n      }\n    ],\n    \"assetSubtreeIds\": [\n      {\n        \"id\": 123456789\n      },\n      {\n        \"externalId\": \"system 99 external Id 1234\"\n      }\n    ],\n    \"source\": \"<string>\",\n    \"createdTime\": {\n      \"max\": 1,\n      \"min\": 1\n    },\n    \"lastUpdatedTime\": {\n      \"max\": 1,\n      \"min\": 1\n    },\n    \"uploadedTime\": {\n      \"max\": 1,\n      \"min\": 1\n    },\n    \"sourceCreatedTime\": {\n      \"max\": 1,\n      \"min\": 1\n    },\n    \"sourceModifiedTime\": {\n      \"max\": 1,\n      \"min\": 1\n    },\n    \"externalIdPrefix\": \"my.known.prefix\",\n    \"uploaded\": true,\n    \"labels\": {\n      \"containsAny\": [\n        {\n          \"externalId\": \"my.known.id\"\n        }\n      ]\n    }\n  }\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Authorization", "Bearer <token>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

require 'uri'
require 'net/http'

url = URI("https://{cluster}.cognitedata.com/api/v1/projects/{project}/files/aggregate")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"filter\": {\n    \"name\": \"<string>\",\n    \"directoryPrefix\": \"/my/known/directory\",\n    \"mimeType\": \"image/jpeg\",\n    \"metadata\": {},\n    \"assetIds\": [\n      363848954441724,\n      793045462540095,\n      1261042166839739\n    ],\n    \"assetExternalIds\": [\n      \"externalId1\",\n      \"externalId2\",\n      \"externalId3\"\n    ],\n    \"rootAssetIds\": [\n      {\n        \"id\": 123456789\n      },\n      {\n        \"externalId\": \"system 99 external Id 1234\"\n      }\n    ],\n    \"dataSetIds\": [\n      {\n        \"id\": 4503599627370496\n      }\n    ],\n    \"assetSubtreeIds\": [\n      {\n        \"id\": 123456789\n      },\n      {\n        \"externalId\": \"system 99 external Id 1234\"\n      }\n    ],\n    \"source\": \"<string>\",\n    \"createdTime\": {\n      \"max\": 1,\n      \"min\": 1\n    },\n    \"lastUpdatedTime\": {\n      \"max\": 1,\n      \"min\": 1\n    },\n    \"uploadedTime\": {\n      \"max\": 1,\n      \"min\": 1\n    },\n    \"sourceCreatedTime\": {\n      \"max\": 1,\n      \"min\": 1\n    },\n    \"sourceModifiedTime\": {\n      \"max\": 1,\n      \"min\": 1\n    },\n    \"externalIdPrefix\": \"my.known.prefix\",\n    \"uploaded\": true,\n    \"labels\": {\n      \"containsAny\": [\n        {\n          \"externalId\": \"my.known.id\"\n        }\n      ]\n    }\n  }\n}"

response = http.request(request)
puts response.read_body

{
  "items": [
    {
      "count": 1
    }
  ]
}

{
  "error": {
    "code": 401,
    "message": "Could not authenticate.",
    "missing": [
      {}
    ],
    "duplicated": [
      {}
    ]
  }
}