How to use the ng-zorro-antd.NzTreeNode function in ng-zorro-antd

this.nodes = treeData.map(doc => {
            this.expandKeys.push(doc.id);
            return new NzTreeNode(doc);
        });
    }

this.nodes = treeNodes.map(doc => {
            this.expandKeys.push(doc.id);
            return new NzTreeNode(doc);
        });
    }

this.nodes = treeData.map(doc => {
            this.expandKeys.push(doc.id);
            return new NzTreeNode(doc);
        });
    }

        return tree.map(node => new NzTreeNode(node));
    }

this.nodes = treeData.map(doc => {
                this.expandKeys.push(doc.id);
                return new NzTreeNode(doc);
            });
        });

const nodes = tree.map((doc: any) => {
            expandKeys.push(doc.key);
            return new NzTreeNode(doc);
        });

const nodes = tree.map(doc => {
            expandKeys.push(doc.key);
            return new NzTreeNode(doc);
        });

this.nodes = treeData.map(doc => {
            this.expandKeys.push(doc.id);
            return new NzTreeNode(doc);
        });
    }

const nodes = treeData.map((doc: any) => {
                this.expandKeys.push(doc.id);
                return new NzTreeNode(doc);
            });
            this.nodes = nodes;

        return tree.map(node => new NzTreeNode(node));
    }