https://api.redocly.com/registry/bundle/xsolla/igs-bb-api/v1/openapi.yaml

I received a d.ts file through In this api specification basic usage

version >>> "openapi-typescript": "^7.0.0-next.2",
script >>> openapi-typescript openapi/spec.yaml --output src/types/api.ts

From this file
type Test = paths['/v2/project/{project_id}/items']['get']['responses']['200']['content']['application/json']['items']

on the receiving end of
if (props == null) return null
if ('item_id' in props) return

I solved it thank!