How to use the node-opcua-address-space.ensureObjectIsSecure function in node-opcua-address-space

Object.defineProperty(this._sessionSecurityDiagnostics, "clientCertificate", {
                    get(this: any) {
                        const session: ServerSession = this.$session;
                        return session.channel!.clientCertificate;
                    }
                });


                this.sessionSecurityDiagnostics = sessionSecurityDiagnosticsType.instantiate({
                    browseName: new QualifiedName({ name: "SessionSecurityDiagnostics", namespaceIndex: 0 }),
                    componentOf: this.sessionObject,
                    extensionObject: this._sessionSecurityDiagnostics,
                    minimumSamplingInterval: 2000 // 2 seconds
                }) as UASessionSecurityDiagnostics;
    
                ensureObjectIsSecure(this.sessionSecurityDiagnostics);

                this._sessionSecurityDiagnostics = this.sessionSecurityDiagnostics.$extensionObject as SessionSecurityDiagnosticsDataTypeEx;
                assert(this._sessionSecurityDiagnostics.$session === this);
    
                const sessionSecurityDiagnosticsArray = this.getSessionSecurityDiagnosticsArray();
    
                // add sessionDiagnostics into sessionDiagnosticsArray
                const node = addElement(this._sessionSecurityDiagnostics, sessionSecurityDiagnosticsArray);
                ensureObjectIsSecure(node);

            }
    
        }

browseName: new QualifiedName({ name: "SessionSecurityDiagnostics", namespaceIndex: 0 }),
                    componentOf: this.sessionObject,
                    extensionObject: this._sessionSecurityDiagnostics,
                    minimumSamplingInterval: 2000 // 2 seconds
                }) as UASessionSecurityDiagnostics;
    
                ensureObjectIsSecure(this.sessionSecurityDiagnostics);

                this._sessionSecurityDiagnostics = this.sessionSecurityDiagnostics.$extensionObject as SessionSecurityDiagnosticsDataTypeEx;
                assert(this._sessionSecurityDiagnostics.$session === this);
    
                const sessionSecurityDiagnosticsArray = this.getSessionSecurityDiagnosticsArray();
    
                // add sessionDiagnostics into sessionDiagnosticsArray
                const node = addElement(this._sessionSecurityDiagnostics, sessionSecurityDiagnosticsArray);
                ensureObjectIsSecure(node);

            }
    
        }

sessionsDiagnosticsSummary.getComponentByName("SessionDiagnosticsArray")! as
          UADynamicVariableArray;
        assert(sessionDiagnosticsArray.nodeClass === NodeClass.Variable);

        bindExtObjArrayNode(sessionDiagnosticsArray, "SessionDiagnosticsVariableType", "sessionId");

        const varType = addressSpace.findVariableType("SessionSecurityDiagnosticsType");
        if (!varType) {
          console.log("Warning cannot find SessionSecurityDiagnosticsType variable Type");
        } else {
          const sessionSecurityDiagnosticsArray =
            sessionsDiagnosticsSummary.getComponentByName("SessionSecurityDiagnosticsArray")! as
            UADynamicVariableArray;
          assert(sessionSecurityDiagnosticsArray.nodeClass === NodeClass.Variable);
          bindExtObjArrayNode(sessionSecurityDiagnosticsArray, "SessionSecurityDiagnosticsType", "sessionId");
          ensureObjectIsSecure(sessionSecurityDiagnosticsArray);
        }
      }