@apollo/protobufjs/google/protobuf/source_context.json

Protocol Buffers for JavaScript (& TypeScript).

{
  "nested": {
    "google": {
      "nested": {
        "protobuf": {
          "nested": {
            "SourceContext": {
              "fields": {
                "fileName": {
                  "type": "string",
                  "id": 1
                }
              }
            }
          }
        }
      }
    }
  }
}